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Would a clone gx200 crank work on my older gx160 with a +.020 billet rod and a flattop piston

My motor has the following parts on it and only revs to ~4000rpm GX160 Arc rod +.020 Flattop piston stock bore File fit rings CM pushrods 1.3 billet rockers 26lb springs(have duals but can't find someone to cut down the seat) 307 lift cam from nrracing (307lift, ICL 08, LS 07) .045...

I just had my motor dynoed with a 22mm mikuni and it gets up to about 4000rpm then stops. The guy says it is too rich with a 130 main and 12.5 pilot so we went down to 98 main and it does the same thing. Carb bad?? Cleaning?? I don't know what is wrong but I need to get this thing working so...

Old style gx160 head(27mm/24mm) Going to port it and mill it prob .065 or more depending on clearance Flat top piston file fit rings Stock bore Arc +.020 con rod NrRacing 307-1006 cam CM pushrods 1.3 billet rockers Dual springs Arc billet aluminum flywheel 6619 (8* advance) On 110octane...

I have a stock db30 frame(length an all dimensions stock)with a modded gx160. What is the max speed that that frame can go?

The parts that I have in it(an older model gx160 with the older 14cc head) are; -ARC Connecting rod +.020 -ARC 6619 flywheel 8degree advance -ut1 flat top piston file fit rings I'm getting new valves, 27mm/24mm and going to mill the head as much as I can while still keeping clearence. I...