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The Yamaha 70 is the same powerhead at the Mercury 50-60hp Yamaha added their own touch.

Cool, yea i may need to drop some pitch and or diamiter but i know i could sell the 12x22 easily as they are very good on the f4s boats, i may try one of Mr Hills props if it dosent work or trade...

Yea i knew it was a higher pitched prop not best for oval racing, im not racing but i do long runs down in the Florida keys 100+ miles ( all straight ) sold my supercharged waverunner and am...

Hounddog, how does Toms 4stroke Merc perform? I'm sure it dosent accelerate as quick as the two stroke and being stock how does it compare? Is he running in the modified class of 2 strokes with it...

Ron, have you herd of anyone that used Simons tune and said it was worth it? I would like to try one of your semi cleavers once my 13' bullet boat is done, will try my 12x22 merc cleaver first and...

If there was a package I'd buy it but once you start messing with Cam duration and what not a special tune would need to be made I would think, Simon performance does have a tune for the Merc 60,...

Tom is a great guy, he gave me alot of info on the Merc formula race, I'm finishing up my boat soon it's a 13' bullet, I'm not racing but I want the most I can get out of it. It's heavy at 400lb bare...

Hi ron, Are the semi cleavers performing best on the merc 4 strokes? If Evinrude would release a mid hp with a short shaft and a good lower unit that would be great, but dosent look like that will...

Not sure, I have heard 6500 rpm is safe any higher is asking for trouble with the valves. Ill be happy with 6500, they rev up to 6300 stock thats pretty high for a stock 4 stroke. Im hoping someone...

Hate to revive an old thread, but anyone have any more info as far as performance is concerned on these 4 strokes? I have a merc formula race 60 15" and like to get it tuned by simon, Ron hill have...