Zongshen 154FMI Engine — X-PRO Ranger 125

Zongshen 154FMI Branded Engine vs. Unbranded OEM

The Ranger 125 runs a Zongshen 154FMI engine — a recognized Chinese powersports brand with a 20-year industry history and an established parts ecosystem. Competitor A, Competitor B, and Competitor C use generic unbranded OEM engines with no stated manufacturer identity. When an engine fails on an unbranded unit, sourcing replacement parts becomes guesswork. With Zongshen, the part number, the supplier, and the service history are all traceable.

For buyers who plan to ride the Ranger 125 beyond the first season, a named engine brand means accessible parts, documented specifications, and a real service path — not a dead end.

350 lbs Max Load Capacity — X-PRO Ranger 125

7-Liter Fuel Tank + 35+ MPH Top Speed — Extended Sessions on One Fill-Up

We equipped the Ranger 125 with a 7-liter fuel tank and a gas-powered drivetrain capable of 35+ mph — giving you extended backyard, trail, or farm sessions on a single fill-up without the range anxiety that comes with electric alternatives at this price point. Ample fuel capacity combined with genuine gas-powered speed keeps the excitement going all day.

A 7-liter tank at 35+ mph means real all-day riding sessions — not 20-minute battery cycles. For farm work, trail exploration, or campsite patrol, gas wins the endurance comparison.

Hydraulic Disc Brakes Front & Rear — X-PRO Ranger 125

Built for Two — Adjustable Driver Seat Fits Riders Up to 6'3"

We engineered the Ranger 125 with a spacious two-seat layout and a driver's seat that slides back to provide ample legroom for riders up to 6'3". Most 125cc mini jeeps in this class are built for a single child rider. The Ranger 125 supports teens, adults, and multi-generational use — farm work, ranch checking, campsite patrol, or family outings where sharing the vehicle is part of the experience.

A seat that fits a 6'3" adult and a passenger position built for real two-person use makes the Ranger 125 one of the few 125cc mini jeeps genuinely designed for adult shared riding.

Full Jeep-Style Realism with Complete Safety Suite — X-PRO Ranger 125

Full Jeep-Style Realism with a Complete Safety Suite

We fitted the Ranger 125 with working headlights, turn signals, brake lights, and a horn — plus a digital dashboard that displays the current gear position (R-N-1-2-3) at a glance. A rear-mounted spare tire and a functional auxiliary fuel can complete the authentic jeep look. Most 125cc go karts at this price point skip working safety features and decorative details. The Ranger 125 delivers both.

Working lights, turn signals, a horn, and a gear-position dashboard are not standard in this class. The Ranger 125 brings a complete safety and realism package at a price where most competitors compromise on one or the other.

Rider Fit Guide

Recommended Age	13 years and older
Recommended Height	5'0" to 6'2" (estimated based on 24.4" seat height)
Maximum Weight Capacity	350 lbs (159 kg)
Suitable Riding Environments	Private land or farm riding on unpaved dirt or grass trails — off-road use only

We built the Ranger 125 for teens and adults who want a genuine gas-powered off-road driving experience — not a toy, but a 125cc semi-automatic go kart that demands real gear engagement and rewards riders who are ready to learn. At 350 lbs maximum load capacity, the Ranger 125 accommodates a broader range of body types than most competitors in its class, making it a practical choice for heavier adults, parents riding with a teen passenger on private property, or families who want a vehicle that grows with them. Riders who own or have access to a farm, private land, or spacious backyard — and who want the extended riding sessions a 7-liter fuel tank supports — will find the Ranger 125 a strong fit.

Always ensure the vehicle's engine size, speed rating, and weight capacity are appropriate for the rider's age, size, and experience level.

Visual fit guide is for reference only. Actual fit may vary based on inseam, footwear, riding posture, and suspension sag.

Licensed U.S. Dealer

20+ Years in Business

U.S. Support

Phone & Email, Real People

OEM Parts in Stock

CA & TX Warehouses

Manufacturer Warranty

Frame 1 Year · Parts 90 Days

Key Features

Zongshen 125cc Engine with 3-Speed Semi-Auto Plus Reverse: We built the Ranger 125 around a Zongshen single-cylinder 4-stroke engine — a recognized brand with a 20-year track record in the powersports industry, producing 5.9 KW at 7500 rpm through a 3-speed semi-auto gearbox with true reverse — giving you the authentic manual-shift driving experience of a real powersport machine at a fraction of what premium brands charge.

7-Liter Fuel Tank, 35+ MPH Top Speed: We equipped the Ranger 125 with a 7-liter fuel tank and a gas-powered drivetrain capable of 35+ mph — giving you extended backyard, trail, or farm sessions on a single fill-up without the range anxiety that comes with electric alternatives at this price point.

Built for Two — Adjustable Seat, Fits Riders Up to 6'3": We engineered the Ranger 125 with a spacious two-seat layout and a driver's seat that slides back to provide ample legroom for riders up to 6'3" — so teens, adults, and multi-generational riders can all get behind the wheel comfortably, whether for trail riding, farm work, or campsite patrol.

Full Jeep-Style Realism with a Complete Safety Suite: We fitted the Ranger 125 with working headlights, turn signals, brake lights, and a horn, plus a digital dashboard that displays current gear position (R-N-1-2-3) at a glance — and topped it off with a rear-mounted spare tire and a functional auxiliary fuel can that make it as head-turning as it is trail-ready.

Reliable U.S. Support, Ready Parts: As a licensed U.S. motorcycle dealer with 20+ years in business, two company-operated warehouses in California and Texas, and a dedicated local team, we keep full replacement parts in stock and ready to ship — so help is there when you need it.

Description

We designed the X-PRO Ranger 125 for riders who want a real gas-powered mini jeep go kart — not an entry-level toy, but a Zongshen-engine-powered off-road machine that actually performs on private land, farms, and unpaved trails. This 125cc go kart runs a Zongshen 154FMI single-cylinder 4-stroke engine through a 3-speed semi-automatic gearbox with true reverse, reaching 35+ mph and supporting up to 350 lbs of rider load — a weight capacity that puts it at or above every comparable model in its class. Built for teens and adults aged 13 and up who want the authentic driving experience of a gear-shifting gas-powered vehicle at a price that makes ownership accessible.

The Zongshen 154FMI engine is the single most important technical fact about the Ranger 125. In a class where most competitors use unbranded OEM engines of uncertain origin, Zongshen is a known quantity — a Chinese powersports engine manufacturer with 20+ years of history and a parts ecosystem to match. The 3-speed semi-automatic transmission with reverse is not a simplified children's throttle: it demands real gear engagement and teaches riders the fundamentals of manual vehicle operation. Paired with front and rear hydraulic disc brakes and full spring suspension at all four corners, the Ranger 125 handles dirt, grass, gravel, and uneven terrain with the stability and stopping confidence that matter when real riders are pushing real speeds.

The 350 lbs maximum load capacity is a genuine competitive advantage — Competitor A rates 265 lbs, Competitor B 242 lbs, and Competitor C 300 lbs. For heavier adult riders, couples sharing a vehicle on private property, or parents riding alongside a teenager, that 50–108 lb margin is the difference between a vehicle that fits and one that does not. The Ranger 125 also includes a complete accessory package straight from the crate: windshield, rear-mounted spare tire, mock fuel jerry can, rearview mirrors, passenger grab rail, side steps, and 18-inch alloy rim wheels with all-terrain tires.

The Ranger 125 is for off-road use only. It cannot be registered or operated on public roads, highways, or any public property in any U.S. state. It is designed for private land, farms, backyards, and designated off-road riding areas. Maximum load capacity is 350 lbs — do not exceed this limit. Recommended minimum age is 13. Adult supervision is required at all times for riders under 18. This vehicle is EPA-certified but is not CARB-certified and cannot be legally sold or operated in the state of California.

X-PRO has operated in the U.S. powersports market for over 20 years as a licensed motorcycle dealer. When you buy the Ranger 125, you are buying from a dealer with two company-owned warehouses in California and Texas, a U.S.-based support team, and a full OEM replacement parts inventory stocked before the vehicle goes on sale. Frame warranty: 1 year. Parts warranty: 90 days. Support is handled in-house — not routed to an overseas contact form.

Technical Specifications

Power

Engine Brand	Zongshen (宗申) 154FMI
Engine Displacement	124cc
Cylinders	1-Cylinder
Cooling System	Air Cooled
Compression Ratio	9.0:1
Bore x Stroke	54 x 54 mm
Max Power	5.9 KW / 7500 rpm
Max Torque	9.5 N.m / 5500 rpm
Transmission	Semi-Automatic (1 Reverse + N + 3-Speed)
Clutch Type	Multi-Plate Wet Clutch
Start System	Electric
Final Drive	Chain Drive
Ignition Type	CDI
Fuel System	Carburetor (PZ22)
Battery (Starter)	12V / 9Ah Gel Battery

Fuel & Performance

Top Speed	35+ mph (depending on rider weight and road conditions)
Fuel Tank Capacity	7 L
Fuel Type	Gasoline (87 Octane)

Mechanical

Frame Type	Steel Frame
Brake – Front	Hydraulic Disc
Brake – Rear	Hydraulic Disc
Suspension – Front	Hydraulic Spring Shock Absorber
Suspension – Rear	Hydraulic Spring Shock Absorber
Wheel Material	Alloy Rim
Front Tire Size	18 x 7-8
Rear Tire Size	18 x 7-8
Seat Material	PVC Leather Seat

Size & Fit

Overall Length	76.5"
Overall Width	43.3"
Overall Height	28.3"
Seat Height	24.4"
Ground Clearance	11"
Wheelbase	49.6"
Net Weight	330 lbs
Max Load Capacity	350 lbs

Certification

EPA Certified

Yes

Safety / Control

Foot Brake	Yes
Headlight	Yes — LED
Tail Light	Yes
Turn Signals	Yes
Horn	Yes
Speedometer	Yes

Comparison

	X-PRO Ranger 125	Comp. A	Comp. B	Comp. C
Max Load Capacity	350 lbs	265 lbs	242 lbs	300 lbs
Wheel Size (F/R)	18x7-8"	18" Alloy Rims	18x7-8" knobby tires	18" Trail Ready Tires
Seat Height	24.4"	Not confirmed	Not confirmed	Not confirmed
Overall Dimensions	76.5"L x 43.3"W	78.4"L x 35.43"W	82"L x 41"W	79"L x 44"W
Engine Brand	Zongshen (宗申) 154FMI	XinYuan/Vitacci OEM	Coolster OEM	Massimo OEM (unbranded)
Engine Displacement	124cc	125cc	125cc	125cc
Max Power	5.9 KW / 7500 rpm	Not confirmed	Not confirmed	Not confirmed (9HP)
Max Torque	9.5 N.m / 5500 rpm	Not confirmed	Not confirmed	Not confirmed
Transmission	Semi-Auto 1R+N+3-Speed	Semi-Auto 3+R	Semi-Auto 3+R	Semi-Auto 3+R
Start System	Electric Start	Electric Start	Electric Start	Electric Key Ignition
Ignition Type	CDI	CDI	CDI	CDI
Battery (Starter)	12V / 9Ah Gel Battery	Not confirmed	Not confirmed	Not confirmed
Seller Type	Licensed U.S. Dealer 20+ Yrs	3rd-party reseller	Venom Motorsports USA	Massimo Motor (brand)
Parts Availability	OEM in U.S. (CA & TX)	Not confirmed	Real-Time Tech Assist	1,000+ service centers
Customer Support	U.S. Phone & Email	No dedicated page	Real-Time Tech Assist	1-800 & email

Data sourced April 2026 from publicly available product listings. Competitor information is subject to change. Specifications may vary by model year. Provided for comparative reference only.

Why Buy From Us

Company History

The company behind X-Pro has been operating in the U.S. motorcycle and powersports market for over 20 years. We are a licensed U.S. motorcycle dealer, not a dropshipper or a temporary marketplace seller. Our operations include product sourcing, compliance review, warehousing, fulfillment, after-sales support, and a dedicated parts inventory — all managed in-house from the United States.

The X-Pro Brand

X-Pro was established in 2018 as a dedicated powersports brand, built on over two decades of hands-on experience in the U.S. motorcycle and powersports market. The product line includes mopeds, scooters, dirt bikes, motorcycles, ATVs, go-karts, and electric powersports vehicles — all sold with full dealer backing. When X-Pro entered the market, the affordable powersports space in the United States was largely defined by short-term sellers offering products with no replacement parts, limited or no after-sales support, and inconsistent quality control. X-Pro was built to bridge that gap.

Why Riders and Families Choose X-Pro

For some buyers, X-Pro is a practical first bike — a more manageable way to start riding without overcommitting on cost. For others, it is a way to get back into powersports without the higher purchase price and repair anxiety that often come with premium-brand machines. And for parents, X-Pro is often the answer to a simple question: how do you give your child the experience of riding — a dirt bike for the backyard, a go-kart for the weekend, an ATV for the family property — without spending several thousand dollars on a brand-name machine they may outgrow in two years? X-Pro makes that gift possible, backed by the same parts availability and warranty support that come with every unit we sell. Always ensure the vehicle's engine size, speed rating, and weight capacity are appropriate for the rider's age, size, and experience level.

Warehouses & Fulfillment

We operate two company-owned warehouses — one in California and one in Texas. These are not third-party logistics (3PL) facilities; they are staffed and managed by our own team. Inventory is stored, quality-checked, and shipped directly from these locations, giving us control over packaging, inspection, and delivery timelines across the continental United States.

After-Sales & Warranty

Every complete unit is backed by a manufacturer warranty. Warranty claims and support requests are handled by our U.S.-based team — customers contact us directly through our website or marketplace messaging, and our team has access to inventory systems, warehouse operations, and product records to resolve issues efficiently.

Parts Availability

We maintain a full replacement parts inventory at our U.S. warehouses. Parts are stocked before vehicles are listed — not ordered from overseas after a customer reports an issue. Parts orders ship from the same facilities that handle complete units.

Team

Our team includes warehouse staff, customer support representatives, and technical specialists — all U.S.-based. When you contact us, you reach someone with direct access to our inventory, our warehouse, and your order records.

Warranty

Every X-Pro complete vehicle is covered by a Limited Warranty: • Frame: 1-year warranty against structural defects • Parts: 90-day warranty against manufacturing defects (excludes normal wear and tear items such as tires, brake pads, and batteries) Limited Warranty covers manufacturing defects only. Normal wear and tear, damage from accidents, misuse, or unauthorized modifications are not covered.

View Full Warranty Policy

Assembly & Setup

What's in the Box

Vehicle body (85% pre-assembled), 4 wheels, spare tire with carrier bracket, mock fuel jerry can, rearview mirrors, passenger grab handle/side rail, steering wheel, windshield, battery, side steps (2), exhaust pipe, wheel center caps (4), rear shock absorbers (2), shift linkage, owner's manual, and hardware bag. Helmet is NOT included — required for safe riding, sold separately.

What You'll Need to Assemble

4 wheels, spare tire carrier, spare fuel tank bracket, shift linkage, passenger grab handle, rearview mirrors, rear shock absorbers, steering wheel, windshield, battery (connect terminals), side steps, exhaust pipe, and wheel center caps. Two-person assembly is recommended for components like wheels and rear shocks.

Assembly Time

Approximately 1.5–2 hours for an experienced DIYer, 3–5 hours for an average handyman, and 6+ hours for first-timers. Assembly time varies based on mechanical experience. Refer to the included full-color illustrated manual and the official YouTube assembly video for step-by-step guidance.

Before You Buy

1 · Stay Connected — We Need to Reach You

After your order ships, our team will contact you by phone and email to coordinate delivery. Answer calls from unfamiliar numbers — our team and your carrier may call from numbers you don't recognize. Check your email daily, including your spam folder, until your vehicle arrives. Without a valid, reachable contact number, your carrier cannot complete delivery. If we cannot reach you, your order may be returned at your expense.

2 · Shipping & Delivery — LTL Freight

Your vehicle ships via LTL (Less-than-Truckload) freight from our U.S. warehouse. The carrier will contact you to schedule a delivery appointment — make sure your contact information is current. Large freight trucks cannot enter narrow roads or tight residential areas. You must meet the driver at an accessible point, or arrange terminal pickup if needed. Inspect the vehicle carefully before signing the delivery receipt. If damage is found, note it on the receipt and contact us immediately with photos.

3 · Assembly & Setup

Professional mechanic assembly is highly recommended. Improper DIY assembly voids safety guarantees and can lead to mechanical failure — incorrect assembly is one of the leading causes of early issues with new vehicles. Regardless of who assembles it, you must tighten all bolts and apply thread-locker (Loctite) before the first ride. Vibration will loosen factory settings during use, causing parts to fall off or break. This is a required pre-ride step, not a defect.

4 · Engine Maintenance — Gas Models

Change the engine oil before your first ride — factory fill is a break-in oil not suitable for extended use. Skipping this step is the leading cause of engine seizure on new vehicles. Use fresh 87+ octane fuel only. Do not use high-pressure washers near engine or electrical components. Drain fuel for long-term storage. Store in a dry area.

5 · Real-World Performance

Top speed and power output are measured under optimal lab conditions. Actual performance varies based on rider weight, terrain type, incline, and ambient temperature. Do not expect lab-rated results in all real-world riding conditions.

6 · Storage

For long-term storage (30 days or more), charge the battery to 50%–60% before storing — do not store fully charged or fully depleted. Store the vehicle indoors in a dry, temperature-stable environment. Cover the vehicle to protect it from dust. Disconnect the battery if storing for more than 60 days. Before returning the vehicle to service after extended storage, inspect all bolts, tire pressure, brake function, and battery charge level.

7 · Safety & Rider Requirements

This vehicle is designed for riders age 13 and older. Riders under 18 must be supervised by a parent or guardian at all times. Always wear a properly fitted, approved helmet and full protective gear — helmet is not included. Maximum weight capacity must not be exceeded. This vehicle is for off-road use only and cannot be registered or operated on public roads, highways, or public property in any U.S. state. This vehicle does not meet California Air Resources Board (CARB) emission standards and is not for sale or use in the state of California.

8 · Break-in Period

We recommend a break-in period for the first 3–5 hours of riding. During this period, avoid sustained full-throttle operation and allow the motor and drivetrain components to seat properly. After break-in, re-inspect and re-tighten all bolts. A properly completed break-in reduces early wear and extends the vehicle's service life.

Support Center & Resources

Contact Us — Phone & Email Support
Warranty Policy
Replacement Parts — Ranger 125 (GK-U01)
Return Policy

FAQ

What does the warranty cover, and what is excluded?

Every X-PRO Ranger 125 is covered by our manufacturer Limited Warranty: 1-year frame warranty against structural defects, and 90-day parts warranty against manufacturing defects. Normal wear items — tires, brake pads, chain — and damage from misuse, accidents, or unauthorized modifications are not covered. View our full warranty policy at xprousa.com/pages/warranty-policy.

How do I submit a warranty claim or request support?

To submit a warranty claim or request support, contact our U.S.-based team through xprousa.com/pages/contact-us by phone or email. Our team has direct access to inventory systems and your order records. For faster resolution, include your order number, photos of the issue, and a description of what happened.

Can I get replacement parts, and how quickly do they ship?

Yes. We stock full OEM replacement parts for the Ranger 125 in our company-owned warehouses in California and Texas. Parts are stocked before vehicles are listed — not ordered after a problem is reported. Browse and order parts at xprousa.com/collections/tl125gk-aranger-125. Domestic shipping from our U.S. warehouses.

What should I do if my vehicle arrives damaged?

If your vehicle arrives with visible damage, take photos immediately before signing or opening the packaging. Note the damage on the delivery receipt. If the damage is severe, refuse delivery and contact our team within 24 hours with photos. For damage discovered after opening, contact us within 48 hours with photos — do not attempt to operate the vehicle before reporting the issue.

Do I need to sign for delivery, and what if I miss it?

Your Ranger 125 ships via LTL freight. The carrier will contact you to schedule a delivery appointment. You must be available to receive the delivery — after 3 missed attempts, the item will be returned and you will be responsible for all return freight fees. Inspect the vehicle before signing the delivery receipt.

How will you contact me after my order ships?

After your order ships, our team will contact you by phone and email to coordinate delivery. Please answer calls from unfamiliar numbers and check your email daily — including spam — until your vehicle arrives.

What happens if you can't reach me during delivery?

If we cannot reach you after multiple contact attempts, your carrier may be unable to complete delivery. After 3 missed delivery attempts, the item will be returned and you will be responsible for all return freight fees. Keeping your contact information current when placing your order is critical.

Is this vehicle street legal?

No. The X-PRO Ranger 125 is for off-road use only and cannot be registered or operated on public roads, highways, or any public property in any U.S. state. It is designed for private land, farms, and designated off-road riding areas. Additionally, this vehicle is not CARB-certified and cannot be legally sold or used in California.

What age is this vehicle recommended for, and is supervision required?

The Ranger 125 is recommended for riders age 13 and older. Due to its weight (330 lbs), speed (35+ mph), and manual gear transmission, it is not suitable for children 12 and under. Riders under 18 must be supervised by a parent or guardian at all times. Maximum load capacity is 350 lbs.

Does the vehicle come assembled, or do I need to assemble it?

The Ranger 125 ships 85% pre-assembled in a protective steel crate. You will need to install the remaining components before riding: 4 wheels, spare tire carrier, spare fuel tank bracket, shift linkage, passenger grab handle, rearview mirrors, rear shock absorbers, steering wheel, windshield, battery, side steps, exhaust pipe, and wheel center caps.

Can I assemble it myself, or do I need a professional mechanic?

Buyers with solid mechanical experience can complete assembly using the included full-color illustrated manual and the official YouTube assembly video. However, professional mechanic assembly is highly recommended — improper assembly voids safety guarantees and is a leading cause of early mechanical issues. Regardless of who assembles it, all bolts must be tightened and thread-locker (Loctite) applied before the first ride.

Do I need to change the oil before the first ride?

Yes — change the engine oil before your first ride. The factory fill is a break-in oil not suitable for extended use. Skipping this step is the leading cause of engine seizure on new vehicles. Drain the factory oil, refill with a fresh oil appropriate for 4-stroke air-cooled engines, and recheck oil level before starting.

What type of fuel does this vehicle require?

The Ranger 125 runs on regular gasoline — 87 octane minimum. Do not use diesel or ethanol blends above E10. Use fresh fuel and avoid letting the tank sit for extended periods, as stale fuel can clog the carburetor. Drain the fuel tank and run the carburetor dry before long-term storage.

How do I prepare the vehicle for long-term storage?

Drain the fuel tank and run the carburetor dry to prevent varnish buildup. Disconnect the starter battery if storing for more than 30 days. Store the vehicle indoors in a dry, temperature-stable area. Cover to prevent dust accumulation. Before returning to use after extended storage, inspect all bolts, tire pressure, brake function, and refill with fresh oil and fresh fuel.

Is there a break-in period, and what do I need to do during it?

Yes. We recommend a break-in period for the first 3–5 hours of riding. During this period, avoid sustained full-throttle operation and allow the engine and drivetrain components to seat properly. After break-in, change the engine oil again and re-tighten all bolts. A properly completed break-in significantly reduces early wear and extends the vehicle's service life.

Other X-PRO Models

Model	Best For	Key Difference
X-PRO Ranger 150	Riders wanting more displacement — 150cc engine upgrade	Larger engine for more torque and top-end power on demanding terrain
X-PRO Rover 125	Riders preferring a traditional go kart body style without jeep design	Traditional go kart format vs. Ranger's mini jeep body
X-PRO Talon 125	Riders wanting a hardtop roof for weather protection	Adds hardtop roof — otherwise similar 125cc powertrain
X-PRO Rover 150	Riders wanting a traditional go kart with 150cc engine	150cc upgrade in Rover format for more power
X-PRO E-Ranger 3000W	Riders wanting electric power in a mini jeep format	Electric motor alternative — no fuel, quieter operation, instant torque
X-PRO E-Rover 2000W	Kids and younger riders wanting an electric go kart at lower power	2000W electric — lower speed, safer entry point for younger riders

All X-PRO models listed are for off-road use only. Not for sale or use in California. Minimum recommended age is 13 for the Ranger 125. Check each model's individual specifications for age and weight requirements.

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