Bogging after 4000rpm after big bore upgrade 85-110cc? HELP!

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Monkeysteve
Posts: 11
Joined: Fri Jan 29, 2021 11:50 pm
Rides:: Ktm 300

Bogging after 4000rpm after big bore upgrade 85-110cc? HELP!

Post by Monkeysteve » Tue Feb 02, 2021 10:09 pm

Bogging after 4000rpm after big bore upgrade 85-110cc

Rebuilt a skyteam st90 monkey bike today. Starts first kick but won’t Rev past 4000rpm and just bogs even at full throttle? Runs fine up to that point. Torqued down bolts properly and doesn’t seem to be leaking anywhere? Was fine before with 85cc head on it

Any ideas much appreciated

Thanks

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