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Performance Engine Upgrades for ST90

2278 Views 1 Reply 2 Participants Last post by  firepower354
Where can I get a top end kit for a Skyteam ST90? How big can I go with the stock engine? Thanks
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You can get a 114cc jug and piston kit from TB for $149.

Honda Trail Bikes

Or... I have a 107cc high compression kit for $100 shipped.

Either way, you'll gain MAJOR performance. The stock iron jug and low compression piston are big holdups. Mild porting helps too. You can add a cam for more topend, if you need it.
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