yamaha rpm and stroke info wanted?

[yama-doo]

well I have two projects going right now and need some tec info on yamaha rpm limits and rod strokes for the engines listed below. I can find ths info all day long for seadoo's but I guess yamaha never break down :biggrin: so I have had trouble locating this info if you can help that would be great!:Banane01:

engine cc ............. RPM .................. Stroke
*500
650
*760
800
1100
*1200

oh by the way my two projects are :
1) My son is building a 760 to drop in a wavejammer hull
2) seadoo hx with a big bore, 78mm stroke yamaha 1200 :biggthumpup:

 

[Mile9c1]

650: 77mm x 68mm (bore x stroke) RPM limiter = 6400 RPM
701: 81mm x 68mm RPM limiter = 7100 RPM
760: 84mm x 68mm RPM limiter = ??? Probably the same as the 701

An 1100 is a 701 with an extra cylinder. A 1200 is a 760 with an extra cylinder.

 

[yama-doo]

so the 1100/1200 would set rev limiters the same as here twin cylinder counter parts? any idea on the 500 stroke?

Thanks for the help:hail:

 

[Mile9c1]

so the 1100/1200 would set rev limiters the same as here twin cylinder counter parts?

It's safe to assume so, they might be a little lower because the rear cylinders tend to detonate easier. Triples run lower compression than the twins, as does the 760's rear cylinder.

any idea on the 500 stroke?

No idea, it was a worthless engine, there's no reason to use one for anything.