Since I've bought my sled new, it has seen nothing but Yamalube. I'll be over 15,000 miles very soon. Never touched the motor yet, compression is down 2-3 lbs from new, and passed a leak down test 2 yrs ago at 13,000 miles. I clean my valves every 3000-4000 miles with minimal carbon build up. Just my .02.
I had similar results with Yamalube, I have 20k miles on my srx and I run a variety of "crap" oil all the time. It takes a whole 10 minutes to check the valves, pull them out every 2k miles and check them... dont buy into the clean valve hype.
You may also have a bad PV shaft seal.
Yea I think ill pull the bad pv and do that then just to save some head aches. I have a set of rear shocks from a 2002 viper, would these be a little softer than the stock srx shocks? I know these sleds are buck boards and the trails around me aren't always maintained the best, what do you guys think?