Hattori 650 with a .91 2-stroke?

[Rick Kent]

Could anyone hazard a guess whether or not a Hattori #650 pipe would work
with 
a MVVS .91 2-stroke engine (or any .90 sized 2-stroke)? If not, what pipe
would work best for it that is available in the US?
I have the engine coming, and since I already have this particular pipe, I
was going to try and save a few bucks by using it. Are there any issues I
need to know about? I remember the pipe being pretty user-friendly on a .61,
so I'm hoping it will have enough chamber volume to work here. Anyone got
any best guesses on a beginning length for the pipe (if it is suitable)? The
intended prop is around a 15-10ish, for the Excelleron.

Regards,
Rick
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