I have a problem that I hope someone can point me in the right direction with. I have an extreme amount of air pressure blowing out of the oil add hole as well as my wet clutch add hole when unscrew the caps. I have tried to get an answer from my yamaha dealer but they won't really tell me anything. To me that amount of air pressure sound like it could be a blow ring. I also as it was sitting in the garage last fall and blew a rear seal. This yr I had changed the wet clutch gasket and filled the oil in there and it came out the rear seal. So maybe the air pressure blew that rear seal out. I just don't know yet. Can anyone pls give me some advice as to were to star with this thing. Thank you

 

First thing to check is the crank case vent. Either on the lower part of the case or could be an the top of the engine. Most lead back to the air box so gasses can be recirculated. If restricted or stopped up this can cause crank case pressure build up.

 

Took a few days to get back to this project but I tracked down the breather tube and it's totally free from any obstruction. Talking to a few other ppl and it might be a timing issue as well. As far as I have been able to see I think it has a set timing and can not be changed but not 100% sure of that.