The stock centrifugal clutch on the Coleman BT200X mini bike is decent enough, but it has limitations when faced with more demanding conditions. For example, I experienced difficulty getting the mini bike going up a steep hill, as the clutch dragged the engine down, preventing it from providing enough power to overcome the hill.

In a previous video (   • Coleman BT200X Mini Bike In The Snow ...  , I tried to run the Coleman minibike through about 18" of snow. While traction was tricky, the centrifugal clutch caused a lot of drag, preventing the engine from getting up to speed.

In this video, I'm installing a Vevor torque converter (a continuously variable transmission) that should allow the engine to rev up faster and help the bike reach a higher speed. This transmission is a copy of the Comet TAV2 transmission, commonly found in bigger street scooters.

I encounter some challenges during this installation, and I'm unsure if the HiSun 196cc engine with its 16mm shaft will work with the Vevor torque converter. However, I plan on replacing the HiSun with a 212cc engine soon, which has a 3/4" shaft, making it compatible with the torque converter.

Join me as I figure out this installation process!



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0:00 Introduction
0:49 The stock centrifugal clutch
1:58 The new torque convert transmission unboxed
3:08 Kiki the cat comes to inspect
3:11 Torque converter components in detail
3:44 5/8" (16mm) to 3/4" shaft adapter
3:48 HiSun engine output shaft
4:41 Getting a top speed baseline on the minibike
5:10 Baseline top speed results
5:26 Removing the old centrifugal clutch and jack shaft
6:38 The crankshaft seal on the HiSun motor is leaking after 3 hours!
7:14 Installing the new torque converter
7:24 Cross support is in the way!
7:42 Frame interference!
8:18 The plan to install the torque converter
8:46 Warranty warning!
9:28 Removing the throttle cable
9:52 Removing the kill switch wires
10:04 Disconnecting the headlight connector
10:17 Disconnecting the engine from the engine mount
10:29 Thinking out loud about the engine spacer
11:01 Cutting out the cross support
11:07 Test fitting the torque convert backing plate
12:37 The clutch bolt is wrong for this engine
14:04 The shaft adapter is too thick
14:19 Using the engine and some sandpaper to make the adapter fit
14:59 Banging on the first half of the driving pulley
15:40 Putting on the belt bushing
15:52 Putting on the belt
16:01 Checking alignment of engine and chain
17:05 The first attempt at an engine spacer
18:35 Reassembled, outside and ready to test!
19:15 First start
19:30 First ride!
20:04 Messing with the governor
21:57 Another test start with more throttle movement
22:08 Still not running great
22:31 My first attempts at engine mount's not so good
23:02 A much better engine mount with square tubing
23:35 Another test ride
23:46 Should you buy a torque convert for the Coleman BT200X?