Oil mushroom valve piston

by Andrew Toth in 912 / 914 Technical Questions 5 years ago

My 912ULS2 engine was made 12/2010. Anyone know if I need just the mushroom piston or do I need a new spring and plug too?

Re: Oil mushroom valve piston

by Roger Lee » 5 years ago

Roger Lee

125 5.12k 4.53k

Here is an easy way to look at it. First the old oil pressure plug was a 17mm hex-head and it was flat and gold colored. The newer style is aluminum colored 17mm hex-head and is indented (or hollowed out) in the center of the head. The spring is the same one, but if you are going to change the plug and or mushroom replace the spring. The ball bearing to the mushroom I think is a good idea, but is not a requirement. More a personal choice. Many that have had some fluctuations or low oil pressure have had some good results.
If you swap out the plug or ball bearing to the mushroom you should put a new spring in. They are only about $8.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Oil mushroom valve piston

by Bill Hertzel » 5 years ago

Bill Hertzel

13 1.95k 7.96k

The Mushroom Valve was created to resolve sporadic issues with Oil Pressure Fluctuations.
Are you having Oil Pressure issues?

if it "Ain't Broke", Don't fix it!

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

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Re: Oil mushroom valve piston

by Andrew Toth » 5 years ago

Andrew Toth

2 11 9

Bill, I am having fluctuations. New mushroom piston going in this week.

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Re: Oil mushroom valve piston

by Bill Hertzel » 5 years ago

Bill Hertzel

13 1.95k 7.96k

Very Good.
If the Mushroom does not solve your problem, let me know.
I may have a solution for you.

My direct contact information is in my Profile.
Just click on my name on this page.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

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Oil mushroom valve piston

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