Just got the bike. It’s an 08 c90t. Cranks and runs but doesn’t fire on rear cylinder. Oil is spitting out of exhaust on back cylinder and it’s popping through the throttle body for the back cylinder. New spark plugs. It has 125psi of compression and it has beautiful blue spark and it IS getting fuel. I did find that the cable for the decompression wasn’t Hooked up in the rear and the bracket wasn’t in correctly but know I don’t know how to adjust it and make it correct. My buddy thinks the exhaust lobe in the back has went flat causing the exhaust valve to not open so it shoots the compression out the throttle body but there’s air pressure coming out of the exhaust. The same amount as the other exhaust. It does look like some one has had the engine removed and has been inside the head recently though. What could possibly cause this?!?!?!

 

Also when I pulled the codes it said “c18” but I can’t find a c18 any where online. What does that mean?

 

heres a video of the bike running