ModMMax
New member
Here's the story. SRX engine in a mountain chassis. First SRX engine I have owned so don'[t have much experience with power valve engines. I was using Shaeffer's (sp) 2 stroke oil in my MM and liked it so just kept on using it in the SRX. Sled ran great in the beginning, I was very pleased, however, performance began to deteriorate over 20 days of mountain riding. EGT's began to rise and plugs began to foul. Power was way down. Finally pulled the power valves and WOW were they dirty. Had problems even getting them out. Scraped and cleaned them and performance is back. EGT's back to normal. Also back is Yamalube oil. Sled was getting so hard to start in the am that I had to pull 2 plugs and pour in a little fuel. Since I cleaned the valves it starts on the 3rd pull with full choke. Thought you might like to know.