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Barn of Parts Sled Salvage LLC

Rollover Valve Bypass Kit

Fits 2017-2021 Sidewinder 

10/14/21... Rollover By Pass Kit Announcement. If you have purchased this please hold off on installing kit as designed. We have 2 instances of a sled smoking after installation of this kit. Unsure if related to the kit, but need to investigate. We had no issues on our test sled after 2 years of testing, so this has caught me off guard. To be safe, I want to look into this in more detail. As a temporary solution you can just route the hose from oil tank cap directly to atmosphere rather than connect it to the valve cover. This will ensure the tank is always vented and oil loss would be minimal during rollover since it is small hose. I stand behind what I sell, and will certainly take care of everyone if we can't use the kit as originally intended. I just need some time to sort through this a bit. If you have installed the kit please provide me with feedback.

The rollover valve vents the oil tank pressure that builds in the system. The spring tensioned valve is in the closed position by default. Once a lb or so of pressure  build in the tank it overpowers the spring and relieves the pressure in the tank. In the event of a roll over the default closed position keeps oil from draining out of the oil tank. There is moisture present in the vented air when the sled sits out overnight in the cold the moisture droplets can freeze the valve in place. When the sled is started with a frozen valve that tank can build excessive pressure in a matter of seconds. In testing we have seen it climb as high as 55 psi in a few minutes of idling. This excessive pressure in turn can blow out the oil tank rtv gasket seal. 

Starting in 2020 Yamaha added a12v heater to the valve which heats up when key is turned on. The heater does heat up the valve to thaw it out, however it is only effective if you key on for a few minutes before starting the sled. Even knowing this I would forget to give it time and my 21 srx had a leaking oil tank by 600 miles.

The bypass kit vents the oil tank to the valve cover. The valve cover is vented to atmosphere so this ensures that the oil tank is still vented in the event that the roll over valve freezes up. By venting to the valve cover it also keeps oil contained within the engine during a roll over.

Retail for the kit is $90 and includes 2 new caps, hose and clamps. 

Yamaha 4 Stroke Snowmobile Specialists