CR85 Crank Seals

Unfortunately I have the same problem with my son's 2003 CR85 Expert. The problem is the way they designed the coupler. There isn't a rubber seal in there, instead it has a metal expansion ring that wears out almost instantly. I have replaced it and the leaking stops for a tank or two then it starts again. My Honda shop say's its normal, but I have been searching for an aftermarket replacement. If anyone knows of one, please let us know.

BTW. The plug is clean and it is running great and in my case I know it is not crankcase oil. Its just the sludge that 2-strokes tend to make. Especially when not being run real hard.

I would hate to think the crank seal is gone already, there are several different methods for testing for leaks, seems to me if it were a rich condition the plug would tell the tale, Rich is correct on the stupid little pipe/silencer seal, you can can a small bit of black rubber hose and replace the original seal and use two small hose clamps to secure it, paint the hose clamps black and you can hardly notice them,

by the way, have you changed the pipe or silencer to an aftermarket?

80's tend to do that unless you are spot on with your jetting. I think boisen(sp) sells a ruber oring styal exsaust flange.my 05 cr85 has two rubber orings on the flange update for this year.
QUICK FIX on my 02 cr80 I used Honda rubber gasket(hardening ,not non hardening) maker and it stopped the uzing from the pipe and exsaust flange works great.

We've had excellent results on our CRs with
PERMATEX ULTRA COPPER Hi-Temp RTV Silicone Gasket Maker
Available at NAPA.