96 XP keeps melting plastic power valves?

[harriwood67]

I have a 96 XP with an 800 cc 2 cyl motor, runs great-but after a couple of mins. running heat somehow comes up the exhaust power valve thing (black cap,spring and green diaphram and red cover) and melts the plastic and the spring flys off! I thought is was a fluke so I bought at the see doo dealer all the parts I needed to put it back together and it did it again! and suggestions?

 

[Bills86e]

The main cause to melting rave caps is Rave valve housing wear. If the valve/blade guide hole is the housing measure over .400" it's time to buy new ones. Also upgrade to the new green o-rings and rave valve caps. The new caps are made from glass filled nylon (6/6 nylon) These new caps will take much more heat with out melting. Also look at any wear on the valve/blade shaft itself. If its got a noticeable groove it might also need to be replaced. Bills86e

 

[harriwood67]

Thanks at least it's a place to start.