800 sxr motor vs 701 based motor

[special fx]

Assume same hull, same pump and exhaust capabilities, which motor has better potential for power utilizing stock parts (no lamey cyls, stroker cranks, etc...)?

What are the Pros/Cons of each motor??

 

[MADMAT]

Assuming the exact same hull and pump set up?

I would say their is no replacement for displacement.

But I would take a 701 and build the hell out of it.

 

[SUPERTUNE]

The Kawasaki motor would be a more horsepower motor, but if your trying to build for freestyle, Yamaha's are a lot less work to achieve killer bottom end power...

 

[kingnothing3]

the kawi... but stock sucks.

 

[RiverRat]

no replacement for displacement

 

[FL-cracker]

The Kawasaki motor would be a more horsepower motor, but if your trying to build for freestyle, Yamaha's are a lot less work to achieve killer bottom end power...

Is this due mostly to a lighter rotating mass? Or porting? Or both?

Does anyone know the weight difference of these two motors?

 

[ROTATION]

I think Kawi is easy to port for bottom end and you don't have to grind huge amounts of aluminuim out of the transfers like you do on the Yami

 

[Proformance1]

I like the Kawi, but all I can say is "Crankshaft" the 701 will last longer!

 

[special fx]

Thanks for the info. I was just curious cause I see a few people trying to squeeze gp800 motors into superjets and it seems it would easier to put a kawi 800 in than a gp800. I was also curious how it stacked up against the 701 based engines. I've seen one sxr motor in a Yamaha and wondered about how worthwhile it would be.

 

[MADMAT]

I've seen one sxr motor in a Yamaha and wondered about how worthwhile it would be.

Got pics?

 

[WaveDemon]

Is this due mostly to a lighter rotating mass? Or porting? Or both?

Does anyone know the weight difference of these two motors?

I think some of it has to do with the roof angles of the ports. yamahas are designed for low end.

 

[WaveDemon]

more design differences.

 

[MADMAT]

Crazy diagrams!!:bigeyes:

All these years I have never seen those.

 

[WaveDemon]

Crazy diagrams!!:bigeyes:

All these years I have never seen those.

some good reading here:

http://www.hpt-sport.com/direct.htm

get a cup of coffee, you'll be reading for while.

 

[special fx]

sxr motor in an FX-1...........I think???

Could be a 750, but if a 750 fits so will a 800......right?

Looks like a 750 gas tank and a repositioned battery, but it seems to fit pretty damn well.

PS: stole the pics from P dub C today.

 

[ROTATION]

The bold lines show how I re-angle the auxiliaries for bottom end

 

[Flash-FX]

With that question in mind, what do you guys think how....say like a 800 Kawi motor compares to a stock stroke 85mm Lamey motor For low end/mid HP? Providing they were modified equally. (same compression, approx same porting, ect). Just from a performance standpoint not a cost comparison.

 

[MADMAT]

I don't know but those both look sick!!!!! That makes me want to polish my head pipe.

Edit: and manifold:bigeyes: Just caught that.

 

[adet16v]

those diagrams are great

 

[Idok]

wow...LPW lamey is PRETTY! :hail: