Tune Yamaha 25/70 SuperTop

[lx.9913]

Tune Yamaha 25/70

hi Guys,,
today i will start a new project,, I've buyed some days ago a Yamaha 25/70 Supertop (850cc 3 cylinder),, so, the idea is to take this around 100cv..

I was thinking of working shaping the mild port, to get more air,, also maybe new carbs, i was thing the one from the 115 V4.. exhaust raising ofc, compression to 175,, higher rpm limiter to 7200/7400...

and ofc new prop, 19/20" laser I was thinking, manual 6" lift, and a new pointed nose..

what do you think about it? any other idea for this project?



to let you know this engine will be mounted on a small Tullio Abbate Junior.. 5.20mt, 325kg.

what do you think will be the mph target?

thank you guys for all the response!!

 

[fitz73222]

Do your research on modifying this engine from people who have done it successfully. Throwing out all of these expectations really doesn't mean much until you understand the weaknesses and strengths of this engine design.

 

[lx.9913]

Do your research on modifying this engine from people who have done it successfully. Throwing out all of these expectations really doesn't mean much until you understand the weaknesses and strengths of this engine design.

I was searching that.. I think is not impossible and not to crazy..
also right now I'm searching the weight of my boat, is a Tullio Abbate Seastar Junior (5.20x1.80mt) all in fiberglass..
thank you!