Just bought an old f4 cat with looks like an almost new 70ces behind it...
Compression on all 3 cilinders are between 175 and 165 psi,
gearcase is mod with nosecone and low water pickup.
Has somebody standard data like compression and squish, timing? I want to find out if the engine has been mod.
Also have the carbs of a 90hp yamaha, to fit these on the engine.
Do you use the the reed plate and reedblocks of the 70?
And what will be the advantage, better pick up and top end?

btw, great forum guys...

Jeffrey