⚡ X-PRO Thunder 40cc Kids ATV
Small ATV. Real Gas-Powered Performance. Built for Their First Ride.
The X-PRO Thunder 40 is a compact gas-powered ATV designed for young riders ages 3–6, with a maximum rider/load capacity of 70 lbs.
It combines a 40cc Xingyue 4-stroke single-cylinder engine, fully automatic chain transmission, 10–15 MPH published top speed, hydraulic disc brakes front and rear, adjustable speed governor, and 4.10-6 tubeless tires in a compact package designed for supervised recreational riding.
🏁 A First ATV Designed Around Simplicity
The Thunder 40 keeps the riding experience straightforward.
⛽ 40cc 4-Stroke Engine
The Xingyue 40cc, single-cylinder, air-cooled 4-stroke engine produces a published maximum of 0.9 kW / 900 W at 6,500 RPM and 1.6 N·m of torque at 5,000 RPM.
Because it is a 4-stroke engine, it uses 87 Octane minimum gasoline without oil-to-fuel mixing.
🕹️ Fully Automatic Transmission
The centrifugal fully automatic chain-drive transmission eliminates clutch operation and manual gear shifting.
That means the rider can concentrate on steering and throttle control.
🛑 Hydraulic Disc Brakes — Front & Rear
The Thunder 40 uses hydraulic disc brakes on both the front and rear.
This is a significant equipment specification for a small ATV and provides hydraulic braking at both axles.
🎛️ Adjustable Speed Governor
Parents can adjust the speed governor to limit the ATV's maximum speed while the rider develops confidence and experience.
The published full-throttle speed is 10–15 MPH.
🛞 6" Tubeless Tires
Both ends use 4.10-6 tubeless tires mounted on steel rims.
The compact tire package is sized specifically for this youth ATV.
🌀 Dual Front Shocks + Rear Shock
The front uses dual front shocks, while the rear uses a single rear shock to help absorb bumps over suitable recreational surfaces.
⭐ Why Families Choose the Thunder 40
⛽ No Fuel Mixing
The 4-stroke engine runs on 87 Octane minimum gasoline without mixing oil into the fuel.
🔄 Automatic Operation
No manual clutch and no gear changes. The fully automatic transmission keeps controls simple.
🎛️ Parent-Adjustable Speed
The adjustable governor allows parents to start with a lower speed setting and increase it gradually as appropriate.
🛑 Hydraulic Braking
Hydraulic disc brakes are fitted to both front and rear wheels.
🛡️ Handlebar Kill Switch
The handlebar-mounted engine kill switch gives an immediate manual engine-shutoff control.
🌟 Seven Design Choices
Available hydrographic designs include:
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🎨 Cartoons
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🟢 Green Camo
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🎤 Hip Hop
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🔥 Hot Rod Flame
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💗 Pink Camo
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⚡ Red Lightning
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⭐ Starry Camo
The hydrographic graphics are sealed under a UV-stable clear coat.
🧰 Rear Cargo Rack + Front Bumper
A rear cargo rack and front bumper guard are included.
📋 Full Technical Specifications
⚙️ Engine & Powertrain
| Specification | X-PRO Thunder 40 |
|---|---|
| Model | ATV-Z06 |
| Engine brand | Xingyue |
| Engine displacement | 40cc |
| Engine configuration | Single-cylinder |
| Engine cycle | 4-stroke |
| Cooling system | Air-cooled |
| Maximum published power | 0.9 kW / 900 W at 6,500 RPM |
| Nominal electric motor power | Not applicable — gasoline engine |
| Peak electric motor power | Not applicable — gasoline engine |
| Maximum torque | 1.6 N·m at 5,000 RPM |
| Number of motors | Not applicable — gasoline engine |
| Ignition | CDI |
| Transmission | Fully automatic |
| Final drive | Chain drive |
| Starting system | Pull start / recoil |
| Fuel | Gasoline |
| Minimum fuel octane | 87 Octane |
| Oil mixing | No |
| Fuel tank | 1 L |
| Top speed | 10–15 MPH |
🔋 Battery & Charging
| Specification | Thunder 40 |
|---|---|
| Propulsion battery | None |
| Battery voltage | Not applicable |
| Battery capacity | Not applicable |
| Charging time | Not applicable |
| Electric motor | None |
| Power source | Gasoline |
Important: This is a gasoline-powered ATV. It does not use a rechargeable traction battery.
🛑 Brakes & Suspension
| Specification | Detail |
|---|---|
| Front brake | Hydraulic disc brake |
| Rear brake | Hydraulic disc brake |
| Front suspension | Dual front shocks |
| Rear suspension | Single rear shock |
| Speed governor | Adjustable |
| Engine kill switch | Handlebar-mounted |
🛞 Wheels & Tires
| Specification | Detail |
|---|---|
| Front tire | 4.10-6 tubeless |
| Rear tire | 4.10-6 tubeless |
| Wheel material | Steel rims |
| Tire type | Tubeless |
| Tire size | 4.10-6 |
📏 Dimensions & Weight
| Specification | Detail |
|---|---|
| Overall length | 42" |
| Overall width | 26.8" |
| Overall height | 28.7" |
| Seat height | 22.46" |
| Ground clearance | 4" |
| Wheelbase | 27.5" |
| Net weight | 76 lbs |
| Gross weight | 95 lbs |
| Maximum load capacity | 70 lbs / 32 kg |
| Package dimensions | 38" × 22" × 20" |
| Frame material | Steel |
| Seating capacity | 1 rider |
👦 Rider Fit
| Specification | Recommended Fit |
|---|---|
| Recommended age | 3–6 years |
| Estimated rider height | 3'0"–4'0" / 91–122 cm |
| Maximum rider/load weight | 70 lbs / 32 kg |
| Seat height | 22.46" |
| Recommended environment | Flat backyard grass or packed dirt |
| Supervision | Direct adult supervision at all times |
The manufacturer's height range is an estimate. Actual fit can vary depending on inseam, footwear, and riding position.
🛡️ Safety & Equipment
| Specification | Detail |
|---|---|
| Engine kill switch | Yes |
| Speed governor | Yes, adjustable |
| Front bumper guard | Included |
| Rear cargo rack | Included |
| Headlight | Decorative / non-functional |
| Frame | Steel |
| EPA certified | Yes |
| CARB certified | No |
| California availability | Not for sale/shipment to California |
| Intended use | Off-road only |
| Owner's manual | Included |
| Tool kit | Included |
⚡ Performance
900-Watt Published Maximum Engine Output
The Thunder 40's 40cc Xingyue 4-stroke single-cylinder engine has a published maximum output of 0.9 kW / 900 W at 6,500 RPM.
Maximum torque is 1.6 N·m at 5,000 RPM.
These are gasoline-engine specifications rather than electric-motor ratings.
🏁 10–15 MPH Top Speed
The manufacturer lists a 10–15 MPH maximum speed range at full throttle.
The adjustable speed governor allows the maximum speed to be reduced for a more controlled introduction to riding.
⛽ 1-Liter Fuel Tank
The Thunder 40 carries 1 L of gasoline and runs on 87 Octane minimum fuel.
There is no oil mixing because the engine is a 4-stroke design.
The manufacturer does not publish a maximum miles-per-tank range, so no unsupported range number is claimed here.
⛰️ Hill Climbing
The manufacturer does not publish a specific maximum hill-climbing angle.
The Thunder 40 should be used on suitable terrain appropriate for its 40cc engine, 70 lb maximum load, 4" ground clearance, and youth-oriented design.
For the recommended use case, the manufacturer specifically identifies flat backyard grass and packed dirt.
🌿 Terrain Capability
The Thunder 40 is intended for off-road recreational use, particularly:
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Backyard grass
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Packed dirt
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Suitable flat outdoor surfaces
It is not designed for public-road use.
🆚 Thunder 40 vs. Other Small ATVs
For a fair comparison, the following table compares the Thunder 40 with the Tao Motor 40cc Mini ATV and the Coolster ATV-3050C using their published specifications.
| Specification | X-PRO Thunder 40 | Tao Motor 40cc Mini ATV | Coolster ATV-3050C |
|---|---|---|---|
| Engine displacement | 40cc | 40cc | 107cc |
| Engine type | 4-stroke, single-cylinder | 4-stroke, single-cylinder | 4-stroke, single-cylinder |
| Cooling | Air-cooled | Air-cooled | Air-cooled |
| Published max power | 0.9 kW / 900 W @ 6,500 RPM | Not published in source | 4.8 kW @ 8,000 ± 500 RPM |
| Published max torque | 1.6 N·m @ 5,000 RPM | Not published in source | 6.9 N·m @ 6,500 ± 500 RPM |
| Transmission | Fully automatic chain drive | Chain | Chain, rear-wheel drive |
| Starting | Pull start | Pull start | Electric |
| Fuel | 87 Octane minimum | Gasoline | Gasoline |
| Fuel tank | 1 L | 1.8 L | 2.06 L |
| Published top speed | 10–15 MPH | Up to 22 MPH listing / governor around 13 MPH | Not published |
| Front brake | Hydraulic disc | Disc | Drum |
| Rear brake | Hydraulic disc | Disc | Hydraulic disc |
| Front tire | 4.10-6 | 4.10-6 | 145/70-6 |
| Rear tire | 4.10-6 | 13 × 5.00-6 | 145/70-6 |
| Front suspension | Dual front shocks | Spring suspension | Double A-arm |
| Rear suspension | Single rear shock | Spring suspension | Shock/spring suspension |
| Max load | 70 lbs | 70 lbs | 145 lbs / 65 kg |
| Seat height | 22.46" | 22.46" | 22.4" |
| Ground clearance | 4" | Published inconsistently by listings | 3.3" |
| Net weight | 76 lbs | 82 lbs | 176 lbs |
| Battery | None for propulsion | Not specified | 12V / 4Ah |
| Electric charging | Not applicable | Not applicable | Battery/electric start |
| Frame | Steel | Not confirmed in source | High-strength steel frame |
| Speed governor | Adjustable | Yes | Speed limiter available |
| EPA | Yes | Listed as EPA-approved | Manufacturer/dealer specifications vary |
| CARB | No | Not California legal | Not specified in cited specification |
| Intended rider | Ages 3–6 | Young riders | 6+ according to manufacturer |
| Seating | 1 | 1 | 1 |
The Tao Motor 40cc listing publishes a 40cc 4-stroke engine, chain transmission, pull start, 1.8 L fuel tank, 4.10-6 front tire, 13 × 5.00-6 rear tire, 70 lb capacity and 22.46" seat height. The Coolster ATV-3050C is substantially larger, with a 107cc engine, 4.8 kW maximum power, 6.9 N·m torque, 12V/4Ah battery, 145 lb capacity and 2.06 L fuel tank.
Where the Thunder 40 stands out
The Thunder 40 focuses on a smaller, simpler package with:
40cc • 900 W published maximum engine output • 1.6 N·m torque • automatic chain drive • hydraulic disc brakes front/rear • 70 lb capacity • 22.46" seat height • adjustable governor
That makes it more appropriate for its intended 3–6-year-old / 70 lb maximum rider category than simply choosing a larger engine based on displacement alone.
🛡️ Buy With Confidence
🔐 Secure Checkout
Complete your purchase through a secure online checkout designed to protect your payment information.
🇺🇸 U.S. Dealer Support
X-PRO states that it has operated as a licensed U.S. powersports dealer for 20+ years, with company-owned warehouses in California and Texas and a U.S.-based support team.
🔧 OEM Parts Support
OEM replacement parts for the Thunder 40 / ATV-Z06 / LY-ATV-40C are maintained in U.S. warehouses.
🚚 Shipping
The Thunder 40 ships by UPS Ground or FedEx Ground in a compact 38" × 22" × 20" package weighing approximately 95 lbs gross.
The manufacturer states a typical delivery timeframe of approximately 3–7 business days from its California or Texas warehouse.
🔍 Quality & Pre-Delivery Condition
The ATV arrives approximately 85% pre-assembled. Final setup includes installing the four wheels, handlebar clamp, front bumper guard, and rear cargo rack.
Professional mechanic assembly is highly recommended.
🧾 Warranty
The manufacturer's limited warranty provides:
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Frame: 1 year against structural defects
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Parts: 90 days against manufacturing defects
Normal wear items such as tires, brake pads, drive chain, and spark plugs are excluded, along with damage caused by misuse, accidents, unauthorized modifications, and other exclusions.
❓ Frequently Asked Questions
1. Does the Thunder 40 need to be charged?
No. The Thunder 40 is a gasoline-powered ATV and has no propulsion battery or charging system.
2. What fuel does it use?
It uses 87 Octane minimum gasoline. The 40cc 4-stroke engine does not require oil mixed into the fuel.
3. Does it come with engine oil?
No. The engine crankcase ships without oil.
Before the first start, add 10W-40 4-stroke motor oil and verify the dipstick level.
Do not start the engine without oil.
4. How fast is the Thunder 40?
The manufacturer publishes a top-speed range of 10–15 MPH at full throttle.
The adjustable speed governor can be used to limit speed below the maximum.
5. What is the maximum range?
The manufacturer publishes a 1 L fuel tank, but does not provide a specific maximum miles-per-tank figure.
Actual fuel range depends on rider weight, terrain, throttle use, speed, and riding conditions.
6. What age is the Thunder 40 designed for?
It is designed for riders approximately 3–6 years old, with an estimated rider height of 3'0"–4'0" (91–122 cm) and a maximum load of 70 lbs / 32 kg.
Direct adult supervision is required at all times.
7. What is the seat height?
The seat height is 22.46 inches.
Actual rider fit depends on inseam, footwear, and riding position.
8. What terrain can it handle?
The manufacturer recommends flat backyard grass or packed dirt and recreational off-road use.
It is not intended for public roads.
9. Can it climb hills?
The manufacturer does not publish a maximum climbing angle.
Because this is a 40cc youth ATV with a 70 lb maximum load and 4" ground clearance, terrain should be selected conservatively and appropriate for the rider's experience.
10. Is the headlight functional?
No. The front LED headlight is decorative and non-functional.
The Thunder 40 is intended for daytime riding, not dusk or nighttime operation.
11. Is it waterproof?
No waterproof or IP rating is published for the Thunder 40.
It should not be marketed as waterproof or used in deep water.
12. Is it street legal?
No. The manufacturer states that the Thunder 40 is off-road use only and not street legal.
It is EPA certified but not CARB certified and cannot be sold or shipped to California addresses.
13. How much assembly is required?
The ATV arrives approximately 85% pre-assembled.
Installation includes:
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Four wheels
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Handlebar clamp
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Front bumper guard
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Rear cargo rack
Assembly time is approximately 45–60 minutes with basic hand tools.
14. Is a helmet included?
No. A helmet is not included and must be purchased separately.
A properly fitted approved helmet and appropriate protective gear should be worn.
📦 What's in the Box?
The Thunder 40 package includes:
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🏁 X-PRO Thunder 40 ATV body — approximately 85% pre-assembled
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🛞 4 wheels
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🕹️ Handlebar assembly
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🛡️ Front bumper guard
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🧰 Rear cargo rack
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🔧 Tool kit
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📖 Owner's manual
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🔩 Required hardware
Not Included
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❌ Helmet
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❌ Engine oil
Add 10W-40 4-stroke motor oil before the first start.
🔧 Before the First Ride
Important Setup Checklist
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Add 10W-40 4-stroke engine oil.
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Check the dipstick and verify the correct oil level.
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Install all four wheels.
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Install the handlebar clamp.
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Install the front bumper guard.
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Secure the rear cargo rack.
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Apply thread-locker to the required bolts.
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Check brakes, throttle, steering and controls.
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Set the adjustable speed governor to an appropriate starting position.
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Confirm the rider is within the 70 lb maximum load.
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Make sure the rider wears a properly fitted helmet and protective gear.
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Operate only on suitable off-road terrain under direct adult supervision.
🏁 The First ATV They'll Remember
X-PRO Thunder 40
40cc • 4-Stroke • 900 W Maximum Published Power • 1.6 N·m Torque • 10–15 MPH • Automatic Chain Drive • Hydraulic Disc Brakes • 4.10-6 Tires • 70 lb Capacity
The Thunder 40 delivers a straightforward first ATV experience with a 40cc 4-stroke engine, automatic operation, adjustable speed control, hydraulic disc brakes and a compact youth-friendly design.
Choose the design that fits their personality, complete the required setup, and create a controlled outdoor riding experience built around the Thunder 40's specifications.
⚡ X-PRO Thunder 40
Compact. Capable. Simple to Operate. Built for Supervised Off-Road Fun.
🔎 SEO Optimization
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X-PRO Thunder 40cc ATV | Kids Gas ATV | 10–15 MPH
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Shop the X-PRO Thunder 40cc Kids ATV with 4-stroke engine, automatic chain drive, hydraulic disc brakes, adjustable speed governor, 4.10-6 tires and 70 lb capacity.