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New to the forum. There are so many sub forums here I wasn't quit sure where to post these questions.

So, I have rebuild several 50, 70, and 90cc engines, I have never really modified one for performance. I currently have a Hensim 110cc engine in really good shape. I was looking into a big valve head and high compression piston. Turns out the big valve head is just a regular 125cc head? I also happen to have a 125cc (TZH157FMI). I was going to use the head from that but now I'm wondering if I can use the bucket/cylinder on the 110cc and the head and just upgrade it to a 125cc.

The reason I don't just use the 125cc engine is because it is a forward/neutral/reverse 3 speed and the other engine is an automatic. I don't care to swap over a few parts if it's possible. This is going in a mega moto 80 mini bike frame.
 

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What's your poison? Mine is 40:1
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I believe, its a bolt on, as long as the cylinder heads and case are the same height.
 
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