Just picked up this BT200X!

#1
I've been really wanting to get an older vintage minibike (and still do) but this popped up locally so I went to check it out. Got it from the original owner who liked to tinker. It has the Stage 4 kit and is definitely a fun bike to ride around in. Here is what has been done to it.

ARC billet rod
Aluminum flywheel
14cc head
18lb valve springs
New rocker arms
New carb
Stage 4 race cam
Torque converter
Hi flow air filter
Race exhaust
Large rear sprocket
AR39010X race plug

The way it is set up right now - it will pull a wheelie right off idle at ease. I was hoping to 'tame' that down a hair so it takes off without being so jumpy. The previous owner gave me a box full of parts and it included a red and blue torque converter clutch spring. I'm not sure which one would be better? This isn't a true Comet TAV, but the one you'd get off OldMiniBikes. He also gave me spare front sprockets so I can adjust gearing to my liking.

What is a good sprocket combo for these bikes? I will be putting on brand new tires that he gave me as well. Is there anything else I can do to this bike that would make a huge improvement? I'm actually impressed on how it rides as is. Fires right up and idles nicely!
 

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SAS289

Well-Known Member
#2
Looks like the bike is all set if you ask me.

What "large" sprocket is on it? If it's a 60 tooth and you want to tame it down use a 10 tooth with it. If you want tamer than that go back to the stock Coleman gearing with the 50 and 10 tooth.
 
#3
Looks like the bike is all set if you ask me.

What "large" sprocket is on it? If it's a 60 tooth and you want to tame it down use a 10 tooth with it. If you want tamer than that go back to the stock Coleman gearing with the 50 and 10 tooth.
I will check when I get home. I know the rear sprocket is definitely larger than the stock one (which he gave me in a box full of spare parts etc). He also had a few front sprockets in the box as well so I'll see what I have!
 
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