1978 Chappy LB50 Derestrict

Curtis Riendeau /
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I Have a 1978 Yamaha Chappy LB50. I would like to get a little more power out of it, I'm not all that worked about top speed but I would like better acceleration for hills.

I pulled the carb and noticed that it is only around a 12mm, I have a vm18 would that be something that would be helpful?

I also ordered a high compression head since my compression was only around 100psi with a mint cylinder bore. I am pretty sure it was meant to be low compression, but I feel higher compression will help my low end quite a bit.

What about a lb80 muffler? would that be less restrictive ? Since the lb80 would do 40-45mph. Im guessing that the 80cc had different gearing as well.

I don't really care all that much if it only does 20-25mph since it is really only for in town, but if I can get it to do 40 like the 80cc then I will.

Is there any cheap aftermarket pipe for the chappy or would I be better to make my own? Would a pipe and baffle be sufficient? I hope I don't sound dumb for asking that!

So honestly I am looking to derestrict the lb50. I know that these bike can scream when set up correctly. I mean I have a 1960's Honda 65cc 4-stroke and it has plenty of power and does 60mph.

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