I have a 97 CR 500 that I play ride on. Lots of trails, some smaller hills, etc.. I don't motocross it, but a few times a year I will hill climb it.
I have noticed that there is a lot of black gooey stuff around the exhaust port, as well as the pipe/silencer joint. There is not much black goop that comes out the tailpipe. This just makes the bike a pain to clean, and keep looking nice.
I am wondering if by changing to a 60:1 ratio will the black goopy stuff go away? I am running 40:1 now.
The bike runs fine, and I understand I may need to re-jet since there will be more fuel (due to less oil) in the air - fuel mixture.
Whadda ya think? Is 60:1 too extreme? Will I burn up the top end?
Thanks for the advice.
Rod