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That's awesome Boomski...time for the Yami lol.

the Excell with the 32 might crack 100. Great job so far Boomer.

yamaha needs,.

clamp

shift shaft

cowl

l/u i have wont run 100 as is.

Awesome boomer

Your going in the right direction...that yamaha isn't gonna do it! Lol

i could make it do 100, I might want to open it up first,..... DOK can i put a horizontal efi front on my excel block? or would that make it slower.??? i finally found a donar yamaha block too play with, i need to take it apart and see whats inside..

The efi front will bolt right up but the jury is out if it will make more power. I know you'll definitely need to run a buracato merc box so you can tune it. The biggest small block efi yamaha was 200 and you've got to deal with the O2 (which all goes away with the merc box).

A set of Kottman carbs and a pro-v ignition would be the easiest way to build power IMO (if you're porting).

does swapping to a horizontal front make a big difference on a yamaha?

You already have a horizontal front. The efi style stacked front may make a slight difference...but I've never done it so who knows. I can't see it being a huge gain or there'd be more swapping going on.

my excel appears too have a vertical front , the efi 200 i have has a horizontal. can you cross drill the intake like a merc.

Nope...all excels have horizontal reeds...but they are staggered. the efi has a stacked vertical front.

I have cross drilled intakes in stock...