Re: honda cub c90 tuning help / links
Depends alot on the engine, there are more than 1 type fitted to C90's.
If you're lucky you could change the barrel and piston for a 110/125 (same bore size 52.4mm) and a head from the same (23mm inlet, 21mm exhaust)
You can get cams for these heads but they are relatively pricey, best option would be to get an E22 head from a 72cc chinese clone, same valve sizes, slightly smaller combustion chamber and a very revvy cam.
Port the head and fit a VM22 carb, jet to suit and you should laughing with around 9-10hp.
There was a guy on ebay called pedshed selling flat top 52.4mm pistons and fast road cams very cheap but I think they were end of stock stuff, I've fitted both to a chinese 125 and ported the head/VM22 and it flies.
Hope that helps
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