I was looking on the OS website and came accross this engine. I have never seen it before. It looks the same as the XZ-B but with a different cooling head. Does anyone got more info on it?

http://www.os-engines.co.jp/english/...peed/n_35.html

That is an on road motor.

Brad

There is a thread about the engine in the "Nitro On-Road Engines"
section. I have been waiting to buy one myself. But the only place
that I heard that they are available, so far, is a web store in Japan.
It looks like it will be a few more months before the will available
here in the U.S.A..

Ok thanks guys.

Doh! I guess I should have said North America!

http://www.amainhobbies.com/product_...21M-Carburetor

That link is to the XZ-R, not the Speed Tuned XZ-R.
When Amain does get the Speed Tuned version in
stock, I'll be ordering one from them.

What's the difference between this motor .21xzR and the .21xzb engine?

Crankshaft timing, cylinder sleeve port timing and cooling heads are the
differences between the engines.

That is a big difference,thanks. BTW do you have to run the carb. restrictor?

3.3HP is prety big for a .21 , can timing in crank and sleeve make that much more power

edit: amain have it listed as .28 cu in in the specs but 21 in the title