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I can't ever recall seeing an Allison with yami power!must be some out there!but I don't remember seeing one!anyone have evidence!

Mark Minden's...... BOOM!

thanks, so there is one! any performance numbers versus other 200hp brands!

There is a guy on screamandfly.com that had a kottman 2.6 on an xr and was running 110. He has a 2.5 merc on it now though.

200hp is 200hp...black, grey or white. The weight difference is negligable so the only difference is when the sportmaster comes into play or obviously beyond 225hp (in the small motors).

I would be shocked beyond belief if somebody prooved to me that they experienced a speed improvement with a sportmaster over a good coned 200 case.... especially with just a 200hp motor. I might even consider eating poop if it happenned. lol.

2.6L doing 110? interesting.

There's lots of Allison's ( and other brands ) state side that run Yamaha power. Tons actually. There work very well. They compare to the other 200's out there just the same. . . and the weight difference of a 2.6 is very minimal with a 2.5. If rigged for that weight difference it isn't a problem at all.
Now put a 2.6 on any boat with a cut down mid and adapt a Merc short trim ram to fit and it's lighter then a Merc. You just have to port a Yamaha like a Merc to keep in the same speed range.

That's easy. If you have ever seen a true Kottman motor inside you'd know why.
You could do 110 in an XR with a well tuned finger ported motor.

I'm not sure that "easy" is the right word for any serious V-bottom top speed stuff Jeff. You know that there is more to speed than just power.