The only thing yhat it will do is take some spring tension away from the rave spring. You can do the same thing by backing out the red cap in the center of the rave housing. I would go out 1/4 turns at a time if you choose to do so.
Additional gaskets will also pull the RAVE guillotine (thickness of the gasket) away from the piston. This piston / guillotine clearance is critical for low RPM compression building. This is also why Rotax recommends removing a specific amount of material from RAVE guillotine when oversized pistons are employed. Long term, this will leave a small step in the sliding surface of the cylinder's RAVE channel so removing that extra gasket at some point may cause valve sticking
I saw guys doing it as an attempt to keep the rave fully open on long wide open pulls (800's). Results were mixed at best. We even tried pulling the orings out of them for the same reasons. In addition to the low rpms effect that thumbdoctors mention there can be a high rpm penalty also. The port is not "streamlined" if the valve has moved any farther into its slot than flush.
What seemed to be happening was the raves would not stay open toward the end of a long hard heatsoaked pull. Not sure if this was due to a loss of compression as the rings went lame? or if the valve was cycling in and out slightly with the rise and fall of the piston, and they would get out of sync. But loosening the spring seemed to help, until the motor cooled back off, then tight was better again. The blowdown may also been affected? duno? This was on the reg 800, the 800ho we played with last season didn't seem to act the same way. They have more compression and a taller exh port, same rave, whatever it was it' seems to be fixed.
As long as we're discussing RAVE's....I pulled mine out to clean them, and in doing so I pulled the rubber boots off also. I am just wondering if it's nessesary to use the DOW 111 silicone, at both ends of the boot where it seals. If it is nessesary, is there an atlernative to use. That stufrf is quite expensive for no more than you need to use. Thanks for your help, Butch.
