I wish to install a "Reed Type" PCV valve on my Norton to relieve crankcase pressure. However, when I go to parts shops they want to know what car & model PCV valve I am looking for. Without that, they are no help!

Can anyone suggest a car model & year that I can use so the parts guys know what I am looking for?
Thanks!
Stephen

There are no auto parts store solutions, other than the Motormite power steering check valve which many report are short lived.

Search the forum for "breather", there have been numerous posts on the subject. The most popular device is one sold by MikesXS dot com.

Thanks Dave.
On this basis, & avoiding running all over town, the path of least resistance would be simply to order from Mike's.
Stephen

maylar wrote:There are no auto parts store solutions, other than the Motormite power steering check valve which many report are short lived.

Many people or one person?

I haven't had any trouble with the motormite pcv on my 850 although I must admit it's only been on there for a few hundred miles. I bought it at one of the local car parts places, off the rack. It's actually a brake booster check valve, not a pcv, but it was in the same section. A helpful clerk actually found it for me, which I must say is unusual these days.

Debby

Hi Debbie,

I have to admit I was reluctant to try the Yamaha reed valve. After replacing the motormite with this, my valve cover leaks stopped. I suspect the motormite works, but the Yamaha part works even better. Another thing I noticed is when draining the oil from the sump it comes out very slowly now as no air is getting in to allow the oil to flow easily...suppose that's a good thing.

Going to the root cause - there must be a reason due to wear the makes the reed valve necessary. A new engine never needed it. So, are we treating the symptom and not the cause.

illf8ed wrote:A new engine never needed it

If Norton had fitted a one way valve in the breather in 1968 we would have had leak free Nortons with more horsepower right from the start.

illf8ed wrote:
A new engine never needed it.

They were inclined to leak a bit if thrashed.

debby wrote:

maylar wrote:There are no auto parts store solutions, other than the Motormite power steering check valve which many report are short lived.

Many people or one person?

I haven't had any trouble with the motormite pcv on my 850 although I must admit it's only been on there for a few hundred miles. I bought it at one of the local car parts places, off the rack. It's actually a brake booster check valve, not a pcv, but it was in the same section. A helpful clerk actually found it for me, which I must say is unusual these days.

Debby

Reports of life expectancy vary from 10 to 3000 miles. Bottom line is that they're not designed to 'switch' at the frequency we need for cranckcase pressure control. Mine lasted 200 miles. I hope your experience is better.

illf8ed wrote:Going to the root cause - there must be a reason due to wear the makes the reed valve necessary. A new engine never needed it. So, are we treating the symptom and not the cause.

I've owned my 850 since new, and I can tell you that the oil seal at the tach drive (a simple o-ring) spewed oil all over my right foot while the bike was still in warrantee. Valve covers leaked from the day I rode it off the dealer's lot and the timing cover gasket leaked within 15,000 miles. A new engine definitely needed it.

maylar wrote:There are no auto parts store solutions, other than the Motormite power steering check valve which many report are short lived.

Search the forum for "breather", there have been numerous posts on the subject. The most popular device is one sold by MikesXS dot com.

I know MikesXS used to sell the Yamaha reed valve breather, but I can't find it on his web site. Anyone know where it's hidden. I remember seeing it in the past, but can't find it now. Thanks.

Ken

http://www.mikesxs.net/products-40.html#products

You need to scroll down on the page.

Do we have a write up, or posted pics of it installed for a beginner like me?

Hello, my newly rebuilt engine leaks. Fix one leak and then there's 3 new leaks.

I bought a Ducati reed valve pcv and made an adaptor for it to be an in line pcv.
They are fitted to 2 valve motors from 750 up. Probably 4 valves as well, but I don't know for sure.

It rained all weekend so I didn't get to try it out .
(pictures to follow)

graeme

This is what they look like, $20 approx on ebay.




Inside, you can see the 2 reeds.




you just need some alloy round and access to a lathe and some time.




The pieces

The PCV valve should be called the leak eliminator. I chased my tail around replacing the crankshaft seal many times. Finally installed the PCV valve. Viola! No more leaks.