Crankcase Breather Reed Valve
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,081
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From: Ohio
Good option for a damaged breather bore, ran the S&S for years and never had any trouble out of it. If you have a base engine problem like lack of ring seal or bad umbrella seals, the reed valve won't be a miracle cure for the mentioned problems causing oil out the head breathers.
Best thing to do is get the breather hoses out of the backing plate and put them to the ground. This method has been debated but a Evo eating it's own **** isn't the answer with running oil into the air cleaner backing plate.
Best thing to do is get the breather hoses out of the backing plate and put them to the ground. This method has been debated but a Evo eating it's own **** isn't the answer with running oil into the air cleaner backing plate.
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,081
Likes: 2,159
From: Ohio
Most use the old Screaming Eagle backing plate set up with a head crossover, run a hose to the ground. Use a high flow air filter and stock cover or a cover of choice.
https://www.ebay.com/itm/99-06-HARLE...ty!45107!US!-1
They make a adapter that crosses the Mikuni to the pictured CV backing plate, used it for years on a 89" Evo
Last edited by 1997bagger; May 20, 2018 at 08:19 PM.
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Yes it will. Any CV carby.
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Joe Kucinski
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Joined: Nov 2009
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From: Farmington ,MS
Had a set of cases with a damaged breather bore...did a lot of reading on these...a lot of conflicting information out there.
Where they first came out...they claimed to work for everything...even shovels...then after they were out for a while, they changed their mind, and said they were only for 93-up EVO's
Ton's of people using them in shovels with good results...ton's of people claiming they don't work at all in anything.
I read an article that said the variance was the cast breather "window" in the cases...it either worked or it didn't...if it didn't, you had to weld on the cases to fix it...that seemed the most credible...I don't have the link.