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post #1 of (permalink) Old 01-03-2004, 11:31 PM
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more power?

I am lookin to throw some more power in my 1989 Yamaha Moto 4, 250, is there any mods I can do to give my atv some more power? [img]images/graemlins/givemebeer.gif[/img]
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post #2 of (permalink) Old 01-04-2004, 11:59 AM
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Re: more power?

I'm not sure what is available from the aftermarket for the Yamaha Moto4, but a great place to start would be anything to increase the airflow thru the engine, along with rejetting the carb for the increased air. I would look for an aftermarket exhaust or at least a slip on silencer if you can't find a full exhaust system, a quality air filter like a K&N or Uni. On sportquads a lot of people either add vents to the airbox lid, or totally remove the lid to let more air get to the engine. If you have a utility quad and ride in lots of mud and water, I would leave the airbox lid alone, and find a way to put a larger diameter air intake snorkel(maybe a 2-2 1/2" vac hose like you see on a large wet/dry tank style shop vac) where the stock snorkel attaches to the box, then possibly route it higher than stock and seal everything really good for those deeper water crossings. All engines are basically airpumps, the more air/fuel you can pump thru them, the more power they wil make. Another thing a lot of people overlook is tires, a lighter set of tires on a utility quad like the Mudlights are like gaining free hp because they don't require as much hp to turn, and if you don't need the high ground clearance, shorter tires on a shaft drive quad act just like a sprocket change on a sport quad. Hope this helps you at least a little. Good Luck [img]images/graemlins/40BEER.gif[/img]
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