Engine wont rev
I just picked up a 1987 Honda XL250R dualsport. The bike sat untouched for two years. The problem is the engine won't rev up and won't go past 30 MPH. The engine is a single cylinder with a dual carb set up. First thing I did was took out the jets, cleaned them very good with carb cleaner, and blew some air through to make sure they were cleaned out. Didn't work. I then took off the exhaust to make sure the wasn't a nest from any critters. It was clean. If you could help it would be appreciated.