81 250r fuel mixture

[Yenko502]

I removed the head on my R to find carbon deposits on piston and head. Just wondering what mixture ratios others are running and what oil any of you would recommend using. I run the factory 20:1 mixture. Doesn't smoke much at idle but likes to cause a smoke show at the top end. Any input will be appreciated.

[Dave8338]

Not sure on that particular engine but 20:1 is rather rich. May have something to do with the newer oils?

All of my premix ring-dingers have run very well at 40:1 using any variety of 2-stroke oil. Usually what is on sale when I need it.

[yaegerb]

36:1 is what I run with HP oil. Castor is a great oil as well. If you go the bean oil route, I suggest 40:1

[90guy]

I run Flotz benoil at 32:1 in my 81. Smells like candy! Never had a problem

[El Camexican]

I removed the head on my R to find carbon deposits on piston and head. Just wondering what mixture ratios others are running and what oil any of you would recommend using. I run the factory 20:1 mixture. Doesn't smoke much at idle but likes to cause a smoke show at the top end. Any input will be appreciated.

That top end smoke show is likely all the excess oil in the bottom of your cases getting thrown up into the hot pipe. I'd back off that 20:1 unless you regularly hold it at WOT for more than 15 seconds at a time. That said a little smoke never hurt anything and depending on how many hours are on your engine those deposits aren't that bad. Try 32:1 and make sure it's jetted correctly.

[onformula1]

Keep everything the same but drop your main jet two sizes test then do a plug reading