Upgrades?

stevennf94

New Member
Sep 3, 2020
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Newfoundland, Canada
Just finished my first build. Its a 80/66cc 2 stroke Grubee Skyhawk gt5a. Everythings stock and I can get around 25-30mph. What are some upgrades I can do to raise top speed other than different sprockets. I live in a hilly area and can't afford to sacrifice torque.
 

Greg58

Well-Known Member
May 1, 2011
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Newnan,Georgia U.S.A.
The single best upgrade for me has been a good expansion chamber, not the small muffler type but the type with a longer head pipe and large body. I made a silencer from the stock muffler, mine sounds like a yz125 but quite.
 
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LR Jerry

Well-Known Member
Dec 19, 2011
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Rockwood, TN
Just finished my first build. Its a 80/66cc 2 stroke Grubee Skyhawk gt5a. Everythings stock and I can get around 25-30mph. What are some upgrades I can do to raise top speed other than different sprockets. I live in a hilly area and can't afford to sacrifice torque.
The biggest upgrade would be a shift kit. You'd also want a techometer to go with it.