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Old 08-24-2006, 08:54 PM
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rebuilding an ATV engine

i'm wanting to build a Mini-Buggie out of an old Kawasaki 350 3wheeler, and i was wondering, how much power can i get out of the engine that's on it? and what suggestions do ya'll have for createing the most power out of a single cylinder engine?

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Old 08-24-2006, 08:58 PM
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a big bore kit, pipe and rejetted carb, a NOS kit for a Mikuni carb flange if your crazy.
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Old 08-24-2006, 09:00 PM
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i'm kinda leary of useing NOS, but the others sound pretty sound, it has a Cobra exhaust on it now, is that a good system? as you can tell i'm new to Motor cycles and ATV's in general
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Old 08-24-2006, 09:01 PM
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just a FYI this is the transmission/rearend section.

Mill the head down a little, take a dremel tool and clean up the ports a little, do a port-matching job for the manifolds, but I wouldn't try actual porting without good knowledge of how it all works with velocity, flow, etc.
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Old 08-24-2006, 09:10 PM
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sorry about posting in the wrong section, i have a friend that knows how to port one of these small motors, how much do you suggest, rough estimate shaveing off of the head? like a few thousandths or so at a time?
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Old 08-25-2006, 08:21 AM
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A neighbor up the street from me makes 110 HP on a 6.5 horse(originally) Briggs and straten for use in a garden tractor puller called a Mini-rod.
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Old 08-25-2006, 10:33 PM
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Quote:
Originally Posted by Jeeper426
sorry about posting in the wrong section, i have a friend that knows how to port one of these small motors, how much do you suggest, rough estimate shaveing off of the head? like a few thousandths or so at a time?

I'm not sure... I don't know exactly the min. safe valve/piston clearance (shaving head brings valves closer to piston, they hit and you have scrap metal), I think 0.050 inch... not sure. I'd ask someone experienced with the engine in question.
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Old 08-25-2006, 10:34 PM
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Quote:
Originally Posted by johnsongrass1
A neighbor up the street from me makes 110 HP on a 6.5 horse(originally) Briggs and straten for use in a garden tractor puller called a Mini-rod.
sweeeet! Got pics and a how-to, or a recepie?
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Old 08-25-2006, 10:35 PM
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was that with the stuff that was listed before? that's pretty impressave man 110HP i'd be happy to just get a measly 50 or 60 out of this engine, he must have a blast with his Mini-Rod, and with the clearanceing, would getting the piston TDC and measureing the distance with like a feeler gauge or something like that work... i'll just call a friend of mine, he sent his top end to a machene shop to have it ported, polished, and clearanced O.O, i think he had a set of valvs put in, i'm not 100% on that though, i'll find out what shop he used, and see how much they want to do a thing like that on that head
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