What does a Sea Doo rave valve do?

What does a Sea Doo rave valve do?

Sea-Doo’s RAVE (or R.A.V.E. = Rotax Adjustable Variable Exhaust) valves were the special exhaust power valves on their 2-stroke Rotax engines. They were designed to change the size of the exhaust ports in order to widen the engine’s power band. Using RAVE valves ensured better low-end power and a higher top speed.

What does the Rotax power valve do?

The Rotax Max FR125 is fitted with a power valve (PV) to give more power, at low revs, by physically lowering the exhaust port height below 7,500rpm. The spring loaded valve opens fully as exhaust gas pressure rises and overcomes the spring.

Does seafoam clean exhaust valves?

Treating your engine with Sea Foam Spray through the intake and using Sea Foam Motor Treatment in your fuel and crankcase will also help to keep your valves carbon-free and operating as they should for many miles.

What does an exhaust valve do on a snowmobile?

Mounted in the exhaust port of many snowmobiles, personal watercraft, and motorcycles, exhaust power valves are devices designed to improve combustion efficiency at varying RPM. Improved efficiency increases horsepower and lowers exhaust emissions.

What does a rave valve do on a Seadoo?

What is the 800ho RAVE valve modification?

This modification converts the 800r Rave valve to exhaust pressure activated like the 800HO. The advantages are numerous. The valves open earlier taking advantage of the motors power sooner.

How do you disassemble rave valves?

To disassemble the rave valves, remove the spring clip on top, remove the black cover. There is a spring under the cover. Remove the piston by turning it with a metric socket. On the bottom of the piston is the rubber “Bellows” be careful with the small retaining spring that hold the bellows on the piston.

What causes the 800’s rave not to hold open all the way?

I’ve heard talk of the 800’s rave not holding open all the way on long pulls, power seems to fall off etc. What supposedly causes it is the piston skirt slighty opens the exhaust port at TDC (it shouldn’t) and one of the aux ex ports “leaks” back into the cyl past the wrist pin cutout.

What is the purpose of a rave gasket modification?

It eliminates the possibility of faulty Rave solenoids not operating the valves correctly. Dyno testing shows a more even power delivery and higher hp and torque at lower rpm in the midrange. For this modification we need your complete valves and housings. We will include new rave gaskets , and springs with the modification.