Looking for feedback from OS 91 Speed owners

[in2deep]

I recently purchased a 91 Speed 3D and absolutely love it. Unfortunately a loose fitting on my fuel tank led to a lean run and shinny piston ring. So im looking at a rebuild, break in and re-tune. I figure this is a good time to make the switch to 15% if im going to do it.

How many of you guys are running these on 15%? I've been running CP 30%, but have read some reports of good performance on 15%. The lower temps and fuel cost is appealing, but don't want to take a hit on power. I'm not at high altitude, so no issues there.

Also, if anyone is data logging I would love to hear what kind of temps you're recording.

[Arclight338]

Bottom line,if you are flying HARD 3D and want power-stick with 30%. You can still stay on the rich side and STILL make power.

I had one of the first OS 91 Speed 3C-NOT 3D. Total POS. NO WARRANTY-OS states same in the manual-wouldn't run with the carb that came with the engine. Switched back to the stock 91HZ-R carb with a Hatori pipe. Since then, I switched to YS and haven't looked back. Now I'm running YS 91 SR-3DS and I have a new YS91SRX Tareq that is going in a Synergy N7. I run Cool Power 30%, Torco 30% and VP 30% Powermaster.

If you are a light sport flyer,15% will probably be ok- but you will see a notable power loss compared to 30%.