- May 5, 2017
Erm the one I had got thrown out a couple of years agoBaz, any chance you could give us a link to the oxy acetylene torch valve you referenced above?
And for those of us in North AmericaIf you can whittle metal somewhat, one of the cheapest reed sets i've come across is the inlet reed block for a mini moto bike. Looks very similar to the reed block in the CNW breather. I got two off ebay for less than £5
BICYCLE PARTS BRAKES CALIPERS DISCS HOSES MASTER CYLINDERS PADS SYSTEMS CABLES BRAKE CLUTCH THROTTLE CARBURETTORS COMPLETE CARBS JETS MANIFOLDS CHAINS 420 PITCH 428 PITCH MINIMOTO ROLLERS & GUIDES TENSIONERS CHASSIS E-SCOOTER PARTS ELECTRICS ENGINE PARTS TOP END BOT.www.ebay.co.uk
No problemo. I can see that would be pretty expensive in the end. I bought one from Mikes XS in the past. Really terrific service I have to say. When you look inside they are all the same, there is just a stainless reed petal, and a rubber seal. Have you considered the Comstock / NYC valve ? that is really the cream of the cropCliff, 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.
Clogged up? I have a mikes XS. Is it recommended to clean or rinse them out periodically?You can take the Yamaha 125 valve apart and use just the half with the reed valve in
Screw it to the redundant electric start blanking plate on a 750
That way you shouldn't get it clogged up with emulsified oil because you get full heat transfer
Correct. I was merely pointing out another source available to those of us in North America. The valve originally linked to does not ship to the USA. I really like Paul's style of valve. However, I do not wish to drill or drill and tap the crankcase. I prefer to not modify the crankcases to allow the bike to be later converted back to pure stock, if I desire. I figure the day may come in the future, where I am no longer interested in speed. [Parish the thought! ]You still have to build a housing like Jim Schmidt did. At that point unless you have a mill you might as well just buy a complete valve.
This is how mine is oriented, outlet is generally horizontal. Has anyone experienced clogging / build up of gunk or has anyone cleaned or rinsed one out with evidence of gunk in there?
Who did you purchase that valve from? Mikes XS? I ask, because in Mikes installation instructions, there is mention of an early and a late style. Both are shown but it doesn't clarify which is early and which is late. One style has inlet and outlet at 90 degrees. The other style has both inlet and outlet pointing the same direction, similar to your valve.