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Heavy Duty Transmission Gear Reduction Box Clutch Twin-chain for 47cc 49cc 2-stroke Pocket Mini Bike T8F 11T 13T 14T 17T 20T Teeth

5.0 (8) Write Review
Free shipping on orders over $29.99

$43.49

$ 22 .99 $22.99

In Stock
  • 【Wide Compatibility】This transmission gear box and centrifugal clutch assembly fits 43cc 47cc 49cc 50cc 2-stroke T8F pocket bike scooter ATV go kart mini bike dirt bike pit bike
  • 【Specifications】Reduction Ratio: 3 to 1 chain reducer. Mounting hole distance(adjacent): 2.97"/75.5mm, mounting hole distance(across): 4.13"/105mm. This is 91mm, not 116mm, and the size is marked in the picture
  • 【Fits Various Sports Vehicles】There are five different front drive sprockets available for five different sizes, specially made for a T8F chain. You can choose and replace sprockets according to the torque and speed you need.
  • 【Crafted For Durability】Heavy duty reduction box twin-chain design for bigger torque transmission than standard reduction box with single chains. The sprocket gear underwent heat treatment to enhance resilience against wear and tear.
  • 【Complete Kit】Install the transmission kit set easily with the included accessories: 1 x reduction box + 1 x clutch + T8F 11T 13T 14T 17T 20T drive sprockets + 5 x spring steel retainer clips. Detailed installation steps are shown in the video


Heavy Duty Gear Reduction Box and Racking Clutch Set for 43/47/49cc Pocket Mini Bike / Scooter / ATV. This gear box with twin-chain design for bigger torque transmission than standard reduction box with single chains.

Please confirm size of your original part. This is 91mm, not 116mm. We marked the size in the last picture.

The reduction box comes with 11,13,14,17,20 teeth total 5 pcs of sprockets.The sprocket is compatible for T8F chains.The transmission kit should fit most 47cc/49cc 2-stroke pocket Bikes.

Reduction Ratio: 3 to 1 chain reducer
Condition: Brand New
Material: Made of aluminum alloy
Color: Black

Package Includes:
Gear Reduction Box x 1
T8F 11T Sprocket x 1
T8F 13T Sprocket x 1
T8F 14T Sprocket x 1
T8F 17T Sprocket x 1
T8F 20T Sprocket x 1
Mounting Bolts Kit x 1

About Parts Quality and After-sale Services:
Please contact with us if there's any quality or other problem.


J L
2025-09-02 09:49:02
Great deal, can't beat it
James D Provo
2025-08-10 10:39:00
I have a amazon Syx I keep rebuilding and this fit perfectly. It's a nice speedbox, came lubricated and works well. It's also a better bargain than some other speed boxes. No complaints no problems = 5 Stars
Robert B.
2025-07-31 11:58:44
This transmission works great. The only snag was when I ordered it my assumption was it says replacement for 49cc motor so I thought the sprocket's that were sent with it were for a 415 chain and I had to order a sprocket that fit this transmission and my chain. It's working great . I guess I should have made sure what type of chain went with this transmission. Good product for the money
Chad Haverfield
2025-07-04 15:43:39
Works awesome!Well made product!I would order again!
Simon
2025-04-04 12:33:23
Yes definitely buy it I love it
JaydaFoooah
2025-02-24 19:08:19
This transmission didn't fit my pocket bike, BUT, gears and everything else does! It's missing a mounting hole right next to the bottom right transmission hole! DOES NOT FIT A "GPR SR" POCKET BIKE!!
daniel o.
2024-12-25 11:46:33
I bought this for a pit bike that I made and it came broken. The clutch bro was already broken from the transmission shaft. I contacted the seller they never replied back I contacted the seller they never replied back.
EMAAR
2024-11-15 13:19:14
This is exactly what I wanted. The quality is good, I have been working for 1 month and there was no defect. I think it will always work well