I always remove the govenor, if you do that, replace valve springs, carb jet, intake, and header, your little 6.5 will put out 9! Check out these links:
first thing i did was swap the crank shaft for a non-tapered shaft and removed the govorner while i had the case split.
have both the stock carb and i just ordered a gx390 (13hp) carb... built a custom intake to match the ported head.
i bought 2 cams one is from N-R racing for "marine winch boarding" .252 lift and the other is from affordablegokarts the .265 mod cam "for large carbs"... gonna see which one i like best
i have both 18 and 26lb springs... i'll prolly run the 18's untill i get some stronger rocker arms.
i can't really run an aluminum flywheel because of the starter (i removed the pull start) and batt charging coil, but i am going to reinforce the blower housing JUST INCASE the flywheel decides to come apart at high rpm
my customer wanted a black engine so I thought I would try the new Harbor Freight Predator line, they look reverse engineered but there are some differences from the blue Lifan engines, some changes for the better!
the mounting diagram with measurements is a nice touch
notice the engine provides 2 wire swivels for your throttle!
the wire swivels are attached by axle style retaining clips
the gas tank bolts from the bottom instead of the back
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