XS type reed valve

Triton Thrasher said:

His prices are reasonable, to be fair.

I’d have bought from him, but being in the UK, it made more sense to find a scooter valve with the stubs at a suitable angle, on EBay.

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How much was the valve from him? $15? It was the shipping that was the killer. You should be able to find something comparable on eBay for $5 and maybe even with free shipping.

i got mine from the XS 650 shop, Germany ! described as a breather PVC valve UNI ,
E23.00 .rudiger paustian,
marga faulstich st
Kiel
part no 05-0677
hope this is still available ,
Regards all Colin

colin davie said:

i got mine from the XS 650 shop, Germany ! described as a breather PVC valve UNI ,
E23.00 .rudiger paustian,
marga faulstich st
Kiel
part no 05-0677
hope this is still available ,
Regards all Colin

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Well, if you’re into PVC in such a big way, you go girl!

Deets55 said:

View attachment 14616

I’m sure something like this can be modified and mounted to the old magneto area on the timing side case. Just one example, Bonneville T-100

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I took one of those off my 2008 Bonneville, it was part of the air injection system, designed to instantly blue your exhaust pipes and cause popping on the over run.

cyclegeezer said:

I took one of those off my 2008 Bonneville, it was part of the air injection system, designed to instantly blue your exhaust pipes and cause popping on the over run.

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It’s a reed valve that allows air to flow in only one direction. They are used on all sorts of equipment, especially 2-stroke engines. They react very quickly to changes in air movement and last for a lot of cycles. I bet every chainsaw made has one and they live a long time under those bad conditions.
That’s exactly the type of valve that is in Comstock/NYC Norton sump and case valves and Jim S’s breather valve. Won’t turn your pipes blue if it’s attached to your crankcase

Thanks for the replies. The 125 Yamaha one looks as if it would be okay, but I have been offered the type I require from a very kind forum member.

Deets55 said:

It’s a reed valve that allows air to flow in only one direction. They are used on all sorts of equipment, especially 2-stroke engines. They react very quickly to changes in air movement and last for a lot of cycles. I bet every chainsaw made has one and they live a long time under those bad conditions.
That’s exactly the type of valve that is in Comstock/NYC Norton sump and case valves and Jim S’s breather valve. Won’t turn your pipes blue if it’s attached to your crankcase

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I've got one of the MikesXS valves on the breather line from the timing chest to the tank. I had to move it a bit when I installed the CNW starter system. The valve from the 2008 Bonneville is still around, but the bike got sold on this summer. The Commando with electric start is now my go to ride.

cyclegeezer said:

I've got one of the MikesXS valves on the breather line from the timing chest to the tank. I had to move it a bit when I installed the CNW starter system.

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I had to do the same. Luckily the valve is a right angle - my breather hose goes up behind the air filter plate then the valve makes the 90° transition to the oil tank. Fits like it was supposed to be there.

I just recently stumbled over this thread. Thanks to help from kommando, I've learned that a very nice unit with straight fittings at each end, is used in 2008 -2014 Yamaha YZF-R125s. This unit is not an EGR valve, but an air injection valve. The air injection system is designed to draw filtered air into the exhaust system, to burn any unburned fuel. It is a simplified version of the A.I.R. systems used on North American cars back in the 1970s. Those sysems used an engine driven air compressor to inject air into the exhaust manifolds under certain conditions. A one way [reed] check valve was installed, to prevent reverse flow of the exhaust into the pump. We referred to these check valves as "gulp" valves. You can view the "Air Injection System" chapter of the Yamaha factory repair manual at the link below.

http://www.yam-r125.net/air_induction_system-325.html

I'm going to go call my local Yamaha dealer to get a price and hopefully a part number. Turns out it's a Euro only model. Never brought to the USA. My parts guy asked me to get a part number. Anyone on that side of the pond up for a challenge???

With a bit more searching, I found the Yamaha part number and the suggested retail price.

P/N is 5GD148030000 $97.43 item 44 per

https://www.motorcyclespareparts.eu/en/yamaha-parts/2008-yzf-r125-motorcycles/intake

Considerably more expensive than Mikes, but useful to know, if you need a valve with straight through fittings.

chaztuna said:

I just recently stumbled over this thread. Thanks to help from kommando, I've learned that a very nice unit with straight fittings at each end, is used in 2008 -2014 Yamaha YZF-R125s. This unit is not an EGR valve, but an air injection valve. The air injection system is designed to draw filtered air into the exhaust system, to burn any unburned fuel. It is a simplified version of the A.I.R. systems used on North American cars back in the 1970s. Those sysems used an engine driven air compressor to inject air into the exhaust manifolds under certain conditions. A one way [reed] check valve was installed, to prevent reverse flow of the exhaust into the pump. We referred to these check valves as "gulp" valves. You can view the "Air Injection System" chapter of the Yamaha factory repair manual at the link below.

http://www.yam-r125.net/air_induction_system-325.html

I'm going to go call my local Yamaha dealer to get a price and hopefully a part number. Turns out it's a Euro only model. Never brought to the USA. My parts guy asked me to get a part number. Anyone on that side of the pond up for a challenge???

With a bit more searching, I found the Yamaha part number and the suggested retail price.

P/N is 5GD148030000 $97.43 item 44 per

https://www.motorcyclespareparts.eu/en/yamaha-parts/2008-yzf-r125-motorcycles/intake

Considerably more expensive than Mikes, but useful to know, if you need a valve with straight through fittings.

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How about this one? I have exactly the same one on my Venom. It's inline and comes with hoses and a charcoal canister for £10. I's second hand but there is nothing to go wrong really. They don't specify a postal charge for the U.S. but you can ask them. If you only want the valve it won't be a fortune.


Cheers,

cliffa.

Yes, air injection valves are the same thing except they let air in. The ones from the late model Triumphs are also popular although the mounting is trickier. Look for similar air injection options. I don't know why they are so expensive.

swooshdave said:

Yes, air injection valves are the same thing except they let air in. The ones from the late model Triumphs are also popular although the mounting is trickier. Look for similar air injection options. I don't know why they are so expensive.

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They are just reed valves at the end of the day, just used for differing purposes.

Here's another, £19.99 ( or offer) and £12 shipping to the U.S.

swooshdave said:

snipped I don't know why they are so expensive.

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The US government requires manufacturers to have extended warranties on emission devices. So the manufacturers simply build in a healthy profit margin to cover such contingencies. I'm sure the UK and EU do the same. FYI, here, your catalytic converter is covered by warranty for 8 years or 80,000 miles. Most consumers don't know this and the dealers don't want you to know. They like to "double dip". Several years ago, I had a nice old lady customer with an Infiniti. Check engine light was on. I diagnosed it as a bad catalytic converter. She was within the 8 years/80,000 miles. I sent her to the dealer, explaining that the extended warranty would cover this very expensive repair. Naturally, the dealer charged her $1,500 for the repairs. I looked up the phone number for the Infiniti Zone Representative [sort of a court of appeals for the manufacturer]. She called him. Infiniti sent her a check to cover the repairs. No doubt, the dealer also tried to get paid by Infiniti. They got caught and I'm sure that there was hell to pay with the Zone Rep.

looks like it is back in stock
MAP sells quality stuff and a bit cheaper

Or just buy a 3/8 check valve dump the spring and mount it vertical. I started using these in the 60s sometimes replacing the piston with a steel ball and they worked okay. I fitted one of Mike's valves years ago coz it looked nice, it's still working too. When it fails I'll probably revert.

For over 20 years I used a reed valve from an oxy acetylene torch fitted to the blanking plate where the electric start was supposed to go on my 750
But when my knee went I fitted an Alton starter that was in the way of the reed valve as it poked straight out
So I fitted a 125 Yamaha egr valve ( thanks komando for recommendation) which I took apart and bolted the half with the reed onto the blanking plate
This comes out at 90° and clears the starter motor
And works as good as the acetylene reed valve
Cheers

I have mine installed with the intake side down and haven't had any problems.

Those are the ones I sell. (Triumph AI unit based, the ones circled in red)

$25 = postage.

I have two on hand.

In this orientation, you can fit an e-starter...

cliffa said:

How about this one? snipped

2306 Yamaha Vity XC 125 Exhaust EGR Valve Chamber Unit Assembley | eBay

Find many great new & used options and get the best deals for 2306 Yamaha Vity XC 125 Exhaust EGR Valve Chamber Unit Assembley at the best online prices at eBay! Free delivery for many products!

www.ebay.co.uk

Cheers,

cliffa.

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Cliff, thanks for the eBay links. However, with currency exchange, shipping, customs [lots of reports of the agents taking advantage of Brixit] I can probably buy the 90 degree angle unit, new from M.A.P. Cycle for about the same money. [Thanks for the links htown16] When I reported the $92 price for the straight through valve, I had not done any price comparisons. Turns out the first link Google sent me to, is way over priced. I just found another source with USA warehouse priced at a more reasonable $42.13

MegaZip sourced Air Injection Valve

That was only the 2nd place I found. Hopefully it's available elsewhere for even less.

Having read MikesXS installation instructions for the 90 degree angle valve, installing it "Intake side up" on a Commando would be difficult. I believe that the straight through Yamaha valve offers more options regarding where to install it.

swooshdave said:

Plenty of history on this site about using the Triumph parts (which are EGR to add fuel to that fire).

We've always suggested that MikeXS was just using scooter parts or something but we could never match up the exact model or part.

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Dave, The eBay links below suggests that Mike's valve is used on Kinroad & Skyteam scooters. Probably used on others as well.

90 Degree EGR aka Air Injection Valve

Less Expensive 90 Degree Air Injection Valve

Both the above links refer to these as EGR valves, so I understand where kommando got the term. Without either a repair manual, parts catalog or at least an exploded view, I can not determine how they are originally used. That said, I've never seen a reed valve used in a real EGR [exhaust gas re-circulation] system. True EGR meters a small amount of exhaust gas back into the intake manifold. This is done only when the throttle is open and the engine is fully warmed up. The purpose is to lower the combustion chamber temperature. This is done to reduce oxides of Nitrogen from being released out the exhaust.
Air Injection systems simply use the weak vacuum created between exhaust pulses in a piston engine to draw filtered air from the air cleaner into the exhaust. This is done to help burn any un-burned hydrocarbons leaving the engine. The air injection valve simply prevents the exhaust gases from backing up into the air cleaner.
Two different systems meant to do two different jobs. I suspect that calling these valves EGR valves came from a poor translation of Chinese, Japanese or Korean into English.

chaztuna said:

Cliff, thanks for the eBay links. However, with currency exchange, shipping, customs [lots of reports of the agents taking advantage of Brixit] I can probably buy the 90 degree angle unit, new from M.A.P. Cycle for about the same money. [Thanks for the links htown16] When I reported the $92 price for the straight through valve, I had not done any price comparisons. Turns out the first link Google sent me to, is way over priced. I just found another source with USA warehouse priced at a more reasonable $42.13

MegaZip sourced Air Injection Valve

That was only the 2nd place I found. Hopefully it's available elsewhere for even less.

Having read MikesXS installation instructions for the 90 degree angle valve, installing it "Intake side up" on a Commando would be difficult. I believe that the straight through Yamaha valve offers more options regarding where to install it.



Dave, The eBay links below suggests that Mike's valve is used on Kinroad & Skyteam scooters. Probably used on others as well.

90 Degree EGR aka Air Injection Valve

Less Expensive 90 Degree Air Injection Valve

Both the above links refer to these as EGR valves, so I understand where kommando got the term. Without either a repair manual, parts catalog or at least an exploded view, I can not determine how they are originally used. That said, I've never seen a reed valve used in a real EGR [exhaust gas re-circulation] system. True EGR meters a small amount of exhaust gas back into the intake manifold. This is done only when the throttle is open and the engine is fully warmed up. The purpose is to lower the combustion chamber temperature. This is done to reduce oxides of Nitrogen from being released out the exhaust.
Air Injection systems simply use the weak vacuum created between exhaust pulses in a piston engine to draw filtered air from the air cleaner into the exhaust. This is done to help burn any un-burned hydrocarbons leaving the engine. The air injection valve simply prevents the exhaust gases from backing up into the air cleaner.
Two different systems meant to do two different jobs. I suspect that calling these valves EGR valves came from a poor translation of Chinese, Japanese or Korean into English.

Click to expand...

I've seen those valves offered in the UK but never in the US. I'm not sure if it's that those vehicles aren't offered here or that we don't care that much about emission equipment. When I got my Triumph, like most owners, I immediately ripped off the air injection system.

We always knew the valves were never XS parts, but only more recently had more clues as to what they really were for.