PCV Valve Source?

I'd like to put a PCV valve on my 72' Roadster. I was planning to use the reed type from MikesXS - until I found out they want over $60.00 in FedEx charges to get it to me .

Is there another supplier of a similar valve who doesn't mind sending via post office?

Thanks in advance.

Derek.

Not that anyone has found. There were reports that there may be a scooter part that will work.

Derek,
Standard Motor Products AV13 is pretty old school but they do work. 13 is the hose size, I think in mm's. There are bigger and smaller ones, if you go to any auto parts store they are usually all together on the shelf and if you can talk your way behind the counter maybe you can check them out. It takes some stepping down on the threaded side of the valve that can be done with brass adapters to get a barb size for the outlet. Pretty cheap.
Here's some chit chat on the subject that includes some talk about exhaust 'eductors'.
http://www.eurospares.com/sucker.htm

I haven't fitted it yet but i picked up a PCV off an air cooled Ducati for $20 from a local wrecker.

just to say that the reed valve of any Duke si the round alloy thinghy behind the rear cylinder (on the right hand side)and yes they do work (on dukes)
ps many dukes for track-use are running without it but with a airfilter instead Again a stupid move but IT LOOKS COOL.................There inn't much empty space in those engines.
Ps2 I have never used one on my commandos and they never leaked .Could it be you are looking to solve something without takling the real cause?just wondering....
I used a commando engine in a race-outfit for 6 years running in 5th to 8th place so we were't pottering round.Revs used went to 6500 and some more ,but it was put together with tlc,until it went bang.

The Ducati ones work very well, no more oil leaks. Not even from the 3rd hand exhaust rocker cover gasket that dribbles when the engine is turned off, but does not leak when the engine is running.
You have to make an adaptor for the screw in end though.
graeme.

I have fitted one from a '92 GSXR that was fitted with a "pair" system. This has 2 reeds fitted side by side. I have not tried it out so far. You might get them from breakers for not much money. Or try some Suzuki owners forums as they are removed and binned often.

lynxnsu said:

Ps2 I have never used one on my commandos and they never leaked .Could it be you are looking to solve something without takling the real cause?just wondering.....

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I see this a lot. One person saying they haven't seen a particular Commando "trait" such as wetsumping or excess crankcase pressure so they assume that despite numerous reports of these "traits" that they can't really be happening. I only say to this is to remember the questionable design and build quality at the time and it's highly probable that some bikes were put together better than others.

In the American car industry this was known as the Monday/Friday factor. A car built on Monday may have a still-hungover worker put it together. And on Friday they would be in a rush to get off work and would short cut quality. I doubt this was any different at an English factory in the early 70s.

So, yes, some Commandos will be "perfect" and some not so much. These issues are far to well documented to ignore. If you don't have these problems, count your blessings and ride often.

I just went to the web site. They show the reed valve out of stock when I tried to checkout with it, so I tried a similar part in price and size. It shows they will send it to me via priority mail for 7.21. I am just down the road in Juneau (well kinda down the road) so if it will help you can send parts here and I will forward them or you can pick them up if you get into this area.

According to the USPS web site I can send up to 4 pounds to Canada for 16.77 using first class mail. Over 4 pounds starts to get spendy again. 5 pounds is about 25 bucks! You'd think it was going to NZ or the moon maybe!
Ever get down to Skagway?

Russ

"A car built on Monday may have a still-hungover worker put it together. And on Friday they would be in a rush to get off work and would short cut quality"

Yep, you always want a "Wednesday" car. It's still that way per a friend who works for MB.

That's why I don't work on my bike on Monday, LOL. Friday is OK cause I'm getting her ready for the weekend.

MexicoMike said:

"A car built on Monday may have a still-hungover worker put it together. And on Friday they would be in a rush to get off work and would short cut quality"

Yep, you always want a "Wednesday" car. It's still that way per a friend who works for MB.

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QC is way better than the old days. Assuming the QC doesn't happen on Mon or Weds.

Google the "Motormite Power Brake Check Valve pt #80190. It is available at discount auto part stores like AutoZone and Advance Auto in the "HELP" section.

I have run one for 2 years now and was going to go with Mikes XS valve. I took the motormite unit off to discover that it was in perfect working condition. Great flow through, instant check action. The barbs are the correct size and the 90 degree configuration is perfect for the top front corner of the oil tank. Looks like it really belongs.

The best part....$6.00. For what we are asking this to do, it should last a lifetime. For this price and effectiveness, you could buy all you can get and give them as gifts and be thought of often with good regards.

What do you have to loose except a crank seal and a contaminated clutch and the metal hose adapter on top of the oil tank.

quote :I see this a lot. One person saying they haven't seen a particular Commando "trait" such as wetsumping or excess crankcase pressure so they assume that despite numerous reports of these "traits" that they can't really be happening. I only say to this is to remember the questionable design and build quality at the time and it's highly probable that some bikes were put together better than others.

this was what I meant !! If you ride one of these (wich is not the same as to own one!!!) you should have ripped it apart by now and corrected it mistakes and faults . These' engines were thrown together and still performed very well . I remember when I pulled my first Ducati apart and gazed at the qualty of the castings and gears and everything inside .Then I wandered why it did not outperform my old Commando the way it should have .That old design is simply great but as often the productionline left something to ...... And that is what we should do ,correct the production-line mistakes ..So do not say that my engines were put together on a wednesday because they were not . It is because I spend a lot of time ( and money because of mistakes I made over the years ) getting them right .
IF A NORTON ENGINE IS LEAKING THAN THAT IS A DISGRACE TO THE OWNER-RIDER but unfortunately our beloved Nortons are more of an investment than a source of joy .I often got the remark that thrashing these bikes is a shame as they are worth so much money , but I would rather be a member of a Norton RIDERS club than of a Norton OWNERS club . Also by wreking quite a few of these engines I have helped to keep Norton afloat by bying spares and engines from them .

So please don't spend a few pennies buying one of those reed-valves but look at the real cause of your leaks : a badly put together engine . So correct that and then add one of those poxy thinghies if you still want to .
But believe me ;it is much more fun knowing your engine isn't looking like the Amoco Cadiz because you built it right in the first place

Sorry but got carried away a bit

We're just trying to help a guy out, here.

This issue is basically a 1972 issue. Although I would love to tear into this problem and mod the cases or better yet get a later 280000 set of cases and swap them out, there are remedies for engineering short falls.
I have heard many time in this forum"If it aint broke, don't fix it! This checkvalve ($6.00 usd) not only releaves crank case pressure but a vacuum has been measured. This could theoretically aquant to 1 to 2 horsepower. Not too shabby.
Until the oportunity and the funds become available, I will continue treat my poor investment with tender loving care and enjoy the ride that no other motorcycle could give me including Ducati and Yamaha.

Contrary to the belief of some, the reed valve, such as Mike's XS 650 PCV valve, corrects something the Norton designers overlooked. Crankcase pressure. Jim Comstock provided us with some research on the subject of the pressurized Commando crankcase. Grand Paul recently posted a way for the doubters to test for this pressure. Yes, you can seal the crankcase joints, but this will not prevent crankcase pressure from passing oil mist into the primary through the crankcase seal. Also, there is a gain of power with the installation of one of these valves. There is way too much empirical evidence for anyone to refute the efficacy of installing a PCV inline valve. The one developed by Jim Comstock, sold by CNW, appears to be the best of the lot. My experience with the Motormite vacuum brake check valve was not good. It gave up the ghost after a few hundred miles. I'm not so certain that it had only a placebo effect from the beginning.

Sorry for the duplicate. How do ya delete one of these posts

If we really want to help peoplr who want to use their bikes then correct info is what they need .If we tell them that oil leaks are normal on our engines than we are not telling the thruth . If you say that those valves are the answer you are kidding yourself .A properly put together Norton will not leak , if it does so pull it apart . If you are not prepared to do just that then find some-one to do it for you . If you are not prepared to pull it apart keep it as an investment but please do not tell others to do the same
Those valves can be used as a stop-gap , just as the factory did for years , use stop-gaps .
I am not trying to upset people but stop slagging these engines because of faults wich can be put right . There is enough info available now how to do it properly .
Recently there was a topic about an crankcase seal blowing on this forum The answer : a pvc valve but not where the exess pressure came from . For what it is worth there was massive blowby past the pistonrings etc etc etc So that bloke can fit a pvc valve and wonder why his engine is blown into the weeds by a Hardly Something . A Commando engine is hard to call a difficult engine to strip .We should at least tell why and what and not how to stick a plaster onto a wooden leg














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pvisseriii said:

We're just trying to help a guy out, here.

This issue is basically a 1972 issue. Although I would love to tear into this problem and mod the cases or better yet get a later 280000 set of cases and swap them out, there are remedies for engineering short falls.
I have heard many time in this forum"If it aint broke, don't fix it! This checkvalve ($6.00 usd) not only releaves crank case pressure but a vacuum has been measured. This could theoretically aquant to 1 to 2 horsepower. Not too shabby.
Until the oportunity and the funds become available, I will continue treat my poor investment with tender loving care and enjoy the ride that no other motorcycle could give me including Ducati and Yamaha.

Click to expand...

quote : if it ain't boke don't fix it

If your engine is leaking it IS broke but you may not realise it

lynxnsu said:

pvisseriii said:

We're just trying to help a guy out, here.

Click to expand...

quote : if it ain't boke don't fix it

If your engine is leaking it IS broke but you may not realise it

Click to expand...

My engine is does not leak a drop. I did have blow by into the primary from the crank seal. A 6 dollar part fixed it 2 years and 10,000 mile ago. Is that so wrong?

And PLEASE read the original post and take a pill.