My 50cc racebike + my other bikes

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Exhaust system made !, camera angle makes the pipe look larger closest to the cylinder, but it has the same dimension all the way :)

86206
 
A larger head would look better in my opinion.

Does a Jackshaft prevent engine lockups?
 
A larger head would look better in my opinion.

Does a Jackshaft prevent engine lockups?
With them 2 strokes, engine lockup is normally caused by the chain binding suddenly in the output sprocket housing. A jackshaft will not fix this, but fixes exist, use the forum search function. I like the one where you fill in all extra space there with epoxy. Its normally caused by a loose chain or a sprocket that has an elliptical rotation. Its better to fix the cause than to do fixes to prevent the symptoms.
 
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