Product Description
TrailMaster 300 XRX EFI – High-Performance Adult Go-Kart
The 300 XRX EFI is a serious performance kart: 300cc fuel-injected, liquid-cooled power, CVT with reverse, hydraulic disc brakes, and a tuned suspension. IMPORTANT DISCLAIMER: This kart is built for speed and higher-speed trail riding. It is not designed to creep or crawl up steep hills. Choose this model only if you want performance and have the experience to maintain it.
- 300cc EFI, liquid-cooled single-cylinder — performance-tuned
- Automatic CVT with reverse — no clutching required
- Hydraulic disc brakes (front & rear)
- Independent dual A-arm front suspension • rear swingarm shock
- Adult-size chassis; tighter cockpit than simpler models
- Built for speed — not intended for hill crawling
The TrailMaster 300 XRX EFI brings fuel-injected reliability and liquid cooling to a full-size kart platform designed for speed and responsive handling. It rewards experienced owners who follow break-in and maintenance, and who ride where momentum matters more than low-speed crawling.
Note: the radiator plumbing routes under the seats, so the cockpit has slightly less legroom than our simpler 200-series karts.
- EFI 300cc liquid-cooled engine — cleaner starts, altitude-friendly fueling
- Automatic CVT with reverse — easy operation, no clutching
- Hydraulic disc brakes front & rear for confident stopping
- Dual A-arm front • rear swingarm shock for control at speed
- Performance emphasis: made for speed and flowing trails, not slow hill climbing
- Adult-friendly cockpit, but tighter legroom than 200-class models
| Engine | 300cc EFI, liquid-cooled, 4-stroke, single-cylinder |
|---|---|
| Transmission | Automatic CVT with Reverse |
| Brakes | Hydraulic disc (front & rear) |
| Suspension | Front dual A-arm • Rear swingarm shock |
| Wheels/Tires | Off-road tires on rugged rims (sizes vary by production) |
| Cockpit | Adult-size seating with reduced leg clearance vs 200-series |
| Fueling | Electronic Fuel Injection (EFI) |
| Oil | SAE 10W30 (all our machines use this) |
Need exact tire sizes, belt PN, or dimensions for your batch? Contact our team and we’ll confirm before you order.
Full-size adult platform with a performance-tight cockpit. Taller riders should verify reach and knee clearance. For rider height tips and comparisons, visit our Sizing Guide.
- TrailMaster 300 XRX EFI go-kart (factory crate)
- Owner’s documentation
- Basic tool kit
- GoKartMasters setup resources
Ships securely in a crate with partial pre-assembly. Final steps typically include steering/controls, battery, fluid checks, fasteners, and proper break-in. Recommended for experienced owners due to its performance focus.
Every 300 XRX EFI purchased from GoKartMasters is backed by our support team. For maintenance items and upgrades, visit our TrailMaster Parts Hub or contact us for fitment help.
Is this a beginner-friendly kart?
No. It’s a performance machine for experienced riders who want speed and understand maintenance.
Can the 300 XRX EFI crawl up steep hills?
Not recommended. This model is tuned for speed and momentum on flowing terrain, not slow hill crawling.
Why is cockpit space tighter?
Radiator lines and performance plumbing run under the seats, reducing legroom compared to 200-series models.
What maintenance should I expect?
Follow break-in procedures, check cooling system and drivetrain regularly, and keep up with fluids and fasteners.
What oil do you recommend?
All our machines use SAE 10W30. Prefer premium? We recommend AMSOIL Small Engine 10W-30 (shop via our link).
Safety & Gear Recommendations
Always ride with a properly fitted helmet, goggles, and gloves. We recommend:
- Adult Motocross Helmet
- Carburetor Cleaner
- Seafoam Stabilizer
- Hour Meter
- TrailMaster Blue Paint Match
- Racing-Style Harnesses
- Whip Light
More picks and deals: bit.ly/m/gokartmasters.
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300 XRX
We are still putting it together, holidays and a lot more to it; I understand the need for a secure frame but I wonder how many have a tractor and a winch?
