Hey Guys.
I just acquired a slightly used Webra 91 - 2 cycle.

No damage, a few nicks - but looks clean and turns freely.Compression feels real good.

No papers though.
Horizon Hobby doesn't list this motor anymore, and I don''t read German, so I'm left guessing.

I was wondering if some of you could suggest a prop size and if any of you can share some tech/specs.

I also noticed that the cylinder head has no drilled holes to accept a muffler.
The mounting flange for the muffler is flat, and the pitts style (?)muffler that came
with it is held on by a strap with a turn buckle arrangement, kind of like my old OS 40 rc from 20 odd years ago.

Not sure if this muffler will do the job..it's not much more than a box with a vent and two short pipes coming off the bottom.
(Hope to mount it on a Dragon Lady 60 next year).

Thumbs, if you're handy with tools you can drill and tap the exhaust for a Fox .74 muffler or get a Davis Sound Master but it is a strap on too. I don't like the strap on idea either so I use the front half of the Fox muffler with a J-Tec Snuffler bolted into it, the Snuffler is suitable for engines up to 120. Or just use the Fox .74 muffler as is, but it's a little loud. It will work best with 5% nitro and a 14x6. It's a Dykes ringed engine so don't lean it all the way unless you're sure it's completely broken in. A Fox Gold Post idle bar plug plug will make it totally reliable.

I'll check out the Fox muffler you sugggested....our field likes "quiet" engines and we have new neighbors that feel the same way.

Thanks for the prop suggestion, a 14 prop will be on my list, I think this brute is broken in but I'll know more when I bench test it.

(I used to live in Alexandria myself....been to Arcola/NVRCC but that was many years ago....
I like that Flyin King too).

It's a great engine. I have mine in a Sukoi. I use a 14/6 prop and it will turn it better than 10k if asked. Keep the nitro down to 5% like hobbsy said. I use a slim line strap on pitts style muffler and it works fine. Mine also has a dynamix carb which I believe works better than the TN. Mine also is a standard ring, not dykes, so look at yours tobe sure what you have. The paper work for the Webra speed engines hasn't changed in 20 years and is the same for all sizes. If you still need the paper work send me your email and I'll send you the paper work.

Denis

Boy that was tricky, bundeling the 2 threads right when I was trying to respond. I thought I was going nuts. Not far to go either.

It's going to be 'OK' Denis. We think you have all eight cylinders going. Sorry to confuse you. Hobbsy and I were talking on the side and he asked if I could straighten it out?

Jim