RAVE Valve Spring Broken

[Bassman]

1998 Seadoo GTX RFI Rotax
I discovered on an end of season check that the spring on one of the RAVE exhaust valves was broken. I do not really understand what those valves do but I presume the spring needs to be to spec to allow proper operation.
Could this be the cause of the engine "missing/bogging" under heavy acceleration e.g. accelerating when pulling a couple of tubes up on plane. She runs pretty well otherwise, even when accelerating with no extra load.
Any comments appreciated

 

[mikidymac]

Yes, that valve basically changes the engine timing to allow more bottom end performance then open to allow more top end performance. Eventhough 2-strokes don't have valve timing like a 4-stroke.

With the spring broken the valve will be open too early and cause a loss of bottom end performance which will be worse under heavy load.

Get a new correct spring.

 

[Bassman]

Thanks!