How much hp can you get out of a 90 yamaha with and all out build..
port job shave heads and all the goodies.etc
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How much hp can you get out of a 90 yamaha with and all out build..
port job shave heads and all the goodies.etc
Well, if its a two stroke you're referring to, then its a 70cid engine. Running on gas and just being a hot-rod build up, not adhering to any tech rules administered by a racing organization, you could probably get up to 150 or more. Many jet ski engines get about 1.75 to 2 hp/cubic inch, which are two stroke, so the same could possibly be found in a later loop charged outboard. Whether it will hold up to it is another issue though.Quote:
Originally Posted by mikeymike
Think Hydrotec build them to 120hp reliably, I read that somewhere on here. They got the port map direct from yamaha
the stock carbs are small..............
So are the reeds. The 40 twins up to 90 triples all used the same 6 petal reed cage.
Jeff
Carbs are fine, don't waist you time and money on Hydrotech on a 90 Yamaha. 7500rpm and all the power you want.