I actually wanted that frame to drop a 250cc -350cc engine in it.
I guess that is an 8hp ?
Bigger tires are really going to slow that " punch " down. It probably is a robin subaru engine too right? Not a lot of upgrades for that.
A larger axle sprocket might be to close to the ground, so I would go with a smaller jackshaft sprocket, adjust the the spring tension on driven unit or get a stiffer spring.
You can always remove the governor, get a uni filter, aftermarket exhaust ( I bought mine from robertsons torque tubes. He Also makes air filter adapters..
You can Port and polish the intake and exhaust too. ( I am doing that right now to a 5hp briggs flathead)
There are a few other options but those I will find link for later.
Oh and Welcome!!!!!
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