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Discussion Starter #1
Just bought a 2020 thumpstar 140.
Took the stock air box off played with jetting and man is this thing a pig. I expected it to be slower with the big wheels, But from what I was reading the yx140 was a good motor for feeling torque with the big wheels.
After looking through the Manuel apparently it could have came with a vm22 or vm26. so I’ll be looking at that today.
other then gearing and a carb is there a derestricting mod I’m spacing out about?
I also polished the intake manifold and gasket matched the intake to carb spacer because that was way off.
 
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