"Easy to start once you buy this in the firat ride and when I received it theres NO damage. But in my experienced. After an hour I take my rest a little bit and taking a photo and video and when I do start again I can't start anymore my dirt bike. Thats why I give 3 stars only."
This merchandise cannot be sold to:CA.
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SYX MOTO MK 40cc 4-Stroke Kids Mini Dirt Bike – Automatic Gas Pocket Bike with Pull Start, EPA Approved
SYX MOTO MK 40cc 4-Stroke Kids Mini Dirt Bike – Automatic Gas Pocket Bike with Pull Start, EPA Approved
40cc Kids Off-Road Trail Bike with Speed Governor & Automatic Drive
4.7 / 5.0
(65) 65 total reviews
Regular price
$299.00 USD
Regular price
$899.00 USD
Sale price
$299.00 USD
Unit price
/
per
Shipping Fee: $99.99
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Shipping Notice
Shipping Notice
1. This product ships to 47 Continental States in the USA. Please note that this model is not CA legal. So we do NOT ship it to CA.
2. Receiving time = Processing time + Shipping time.
Processing: usually 1-2 business days.
Shipping time: usually 1-5 days.
Restricted Areas
Restricted Areas
This merchandise cannot be sold to:CA.
Specifications
Specifications
| OVERVIEWS | |
| MODEL NUMBER AND NAME | KXD708B-1(MK40) |
| TOP DESIGNED SPEED | 18.64 mph (30KM/H) |
| MAX RANGE | 15.53 miles (25KM) |
| MAX LOAD | 132 LBS (60KG) |
| RECOMMENDED USER AGE | 12+ years old |
| ENGINE | |
| ENGINE TYPE | 40cc, single cylinder, 4 stroke, air cooled, downward cam, vertical, pull start |
| DISPLACEMENT | 38.95 cc |
| BORE*STROKE | 40mm |
| COMPRESSION RATE | 9.6:1 |
| STARTING MODE | Pull Start |
| IDLE SPEED | 3000±150 rpmz |
| SPARK PLUG TYPE | CM7H |
| FUEL GRADE | ≥90# |
| LUBRICATION TYPE | Negative pressure splash lubrication |
| LUBRICATION OIL GRADE | SF 10W/30 or equivalent model |
| CARBURETOR TYPE | Engine dedicated |
| AIR FILTER | Sponge |
| COOLING TYPE | Air Cooled |
| TRANSMISSION | |
| TRANSMISSION TYPE | Automatic |
| NUMBER OF SPEEDS | No gear |
| DRIVE MODE | Chain |
| CHASSIS | |
| FRAME | Iron |
| HANDLE BAR | Iron |
| TRIPLE CLAMP | aluminum |
| SWING ARM | Iron plate forming |
| FOOTPEGS | Iron |
| MUFFLER TYPE | Engine with exhaust, front exhaust |
| CHAIN | T8F 140L |
| WHEEL BASE | 32.3 inches (820mm) |
| GROUND CLEARANCE | 7.9 inches (200mm) |
| TURNING CIRCLE DIAMETER | 51.2 inches (1300mm) |
| SEAT HEIGHT | 23.6 inches (600mm) |
| HANDLEBAR HEIGHT | 29.9 inches (760mm) |
| BRAKE & SUSPENSIONS | |
| BRAKE OPERATION MODE | Front and rear mechnicial disc brakes |
| SHOCK ABSORBER-FRONT LENGTH | 530mm |
| SHOCK ABSORBER-REAR LENGTH | 8x190mm |
| TYRE TYPE-FRONT | 2.50-10 |
| TYRE TYPE-REAR | 2.50-10 |
| RIM TYPE-FRONT | aluminum/Black |
| RIM TYPE-REAR | aluminum/Black |
| DIMENSIONS | |
| FUEL TANK CAPACITY | 0.27 US Gallon (1.0L) |
| BIKE SIZE |
48.43 x 23.62 x 31.50 inches (1230x600x800mm)
|
| PACKING SIZE |
42.13 x 11.81 x 21.46 inches (1070x300x545mm)
|
| DRY WEIGHT | 49.6 LBS (22.5KG) |
| WET WEIGHT | 51.4 LBS (23.3KG) |
| SHIPPING WEIGHT | 59.5 LBS (27KG) |
| CURB WEIGHT | 183.6 LBS (83.3KG) |
Model Number
Model Number
MK
Warranty Policy
Warranty Policy
We warranty the products to be free of material defects in workmanship for the warranty period from the date your product is delivered. Damages on Arrival shall be notified WITHIN 3 BUSINESS DAYS UPON DELIVERED.
Engine is covered to be free from manufacturer defect for three (3) months.
Parts are covered under warranty to be free from manufacturer defects for one (1) month.
Policy Link:Warranty Policy
Beginner-Friendly Automatic Ride No clutch, no manual shifting, no hassle. The fully automatic transmission allows young riders to focus entirely on balance, steering, and confidence-building. Just pull start and smooth throttle control takes over.
Safety-Focused Design & Speed Control Equipped with a built-in speed governor to limit maximum velocity, an instant kill switch for emergencies, and dual front & rear mechanical disc brakes. The specially sized brake levers are optimized for smaller hands to grip effortlessly.
Clean & Quiet 4-Stroke Engine Powered by a reliable 38.95cc 4-stroke engine—no messy oil-gas mixing required. It delivers a smoother ride and runs significantly quieter than traditional 2-stroke mini bikes, keeping the neighbors happy.
Rugged Construction & Durable Iron Tank Features a heavy-duty iron frame and an impact-resistant iron gas tank built to withstand the bumps and scrapes of backyard exploration. Keeps fuel secure during outdoor adventures.
All-Terrain Off-Road Capability Tough 10-inch knobby tires combined with front and rear suspension handle grass, dirt tracks, and uneven backyard trails with ease, expanding outdoor sport possibilities.
EPA Approved & Environmentally Friendly Meets strict EPA standards for emissions and efficiency. Designed for long-lasting engine life and hours of outdoor recreation.
Kickstart your child's outdoor sports journey with the SYX MOTO MK 40cc 4-Stroke Mini Dirt Bike. Specifically engineered for youth riders (Ages 12+) ready to experience the thrill of off-road riding, this mini gas bike combines manageable power with essential safety features.
Powered by a fuel-efficient 40cc 4-stroke engine, it eliminates the need to mix oil and gas—just fill up with standard regular unleaded fuel and go. With a top designed speed of 18.64 mph and a maximum load capacity of 132 lbs, it delivers the perfect balance of excitement and control. The fully automatic transmission means no complicated gears or clutches to learn, making it the ultimate entry-level choice for beginners tracking private trails or riding in the backyard.
Important Safety Notice: Always wear a helmet and protective gear while riding. Designed for use on private property and designated off-road trails only. Adult supervision is required at all times.
Adult supervision required for children under age 16. Always wear a DOT-compliant helmet, goggles, long sleeves, long pants, over-the-ankle boots, and gloves. This vehicle is intended for off-road recreational use only.Not street legal. Check local laws before operating.
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Overall rating: 4.6923075 / 5 from 65 reviews.
AI Generated Review Summary
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Review highlights
Reviews
"Started leaking gas after first use. Replacing the carburetor today. Hopefully that fixes the issue. When it runs, it's great. Unfortunately, it doesnt run much because of the gas leak."
— Shane (2/5)
Was a great price for
"Was a great price for what you get. Easy to assemble and started right up. was easy for my 7yo to use."
— David C. (5/5)
Kids Love It, But Shipping Needs Improvement
"The bike itself is great—quick assembly, strong power. But the packaging was damaged during shipping, leaving minor scratches. Doesn’t affect use, but better packaging would help. Still satisfied overall."
— Mike T. (4/5)
Granddaughter’s First Dirt Bike!
"Bought this for my 7yrs granddaughter. Assembly was a breeze—we put it together in half an hour. She rides it every day, and the frame is sturdy. Customer service even patiently taught me how to change the oil. Five stars!"
— Sarah M. (5/5)
Safety first
"Emergency kill switch works - tested when Jimmy rode into the clothesline. Fortunately, a full set of equipment was provided for her and emergency braking was applied. After taking a two-week break, she can start cycling again. This time we will pay attention to safety"
— Ace (5/5)
Does the color fade in the sun?
"The edges of the sticker umbrella turned white after three months. Maybe the sunlight in Florida is too intense. However, my son has to ride around three times every day after school. The power of the fuel-powered vehicle is indeed very strong."
— Diego R. (4/5)
I shot a really cool video!
"Bought matching protective gear for my child. KID looks extremely handsome when putting on the gear. I shot a video to record it. If you are interested in children's growth, you can pay more attention."
— Zach (5/5)
The packaging is very sturdy
"The packaging is extremely solid. The logistics company delivered the goods very quickly, and I signed for it in person. It was packed well, and there were no issues at all after I unpacked it."
— Kyle (5/5)
I bought 2 bikes
"My kids are 6 & 8. We bought 1 bike to see how it would ride and see if it was a good purchase or not. The kids absolutely love it and it's the perfect size. They are each about 50 lbs at their ages. The kids rode several times and the bike is fantastic. We just bought a 2nd one and now they are riding together. I highly recommend the 4 stroke engine. These are worth the money"
— Teesa C. (5/5)
Q&A
Questions & Answers
Have a Question?
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Can it be equipped with training wheels
Yes. You can order the training wheels here: https://syxmoto.com/products/syxmoto-kids-dirt-bike-training-wheel?_pos=1&_sid=7f1a6f08d&_ss=r
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Does it come with oil in the engine or do I need to add it?
Hi, it does come with oil in the engine. But I suggest you checking it before starting. See the notes before starting the bike: https://youtu.be/gB7Vl2Zx0dI?si=-Jrmt3f6etJo9-Zf