I found this while doing a search for something else.
Anyone know more and what model?
I have a 89/94 200, as far as I know there ain't a spring on the left hand side.
I not sure that a "pipey bike is a great idea iether.
"I have had mine ported by Fredette, added a Rad valve, FMF pipe and silencer, and revalved the suspension. The motor is great. It has a lot of power and is very pipey. One thing I do that I have not seen mentioned is I remove the spring that is part of the powervalve assembly and is located on the left side of the motor. I actually first noticed this when my dads bike suddenly seemed to run much better then mine. We later found that this is what had happened. He called Fredette and said that is actually how he runs his bikes."