Red J Posted June 19, 2004 Share Posted June 19, 2004 Worth the effort, on a piped/jetted motor? Motor is apart, so the effort is limited to building the parts and modding the airbox. Quote Link to comment Share on other sites More sharing options...
Pete in PA Posted June 19, 2004 Share Posted June 19, 2004 I noticed no change in "rideability" but I removed mine. Mostly because I hate emissions BS and it gives you a lot more to remove every time your in there. Quote Link to comment Share on other sites More sharing options...
The Krypt Keeper Posted June 20, 2004 Share Posted June 20, 2004 Call me dumb, but how do you remove it? Quote Link to comment Share on other sites More sharing options...
Pete in PA Posted June 20, 2004 Share Posted June 20, 2004 I pulled all the hoses off and the air valve then for on top of the valve cover I filled the silver box's with RTV silicone. the hole in the airbox was also plugged. A lot less junk in the way for plugs and valve checks. Worked for me. For on my XR650L there is an unsightly air pump on the left side of the engine simmilar in function. I removed that also with a kit from IMS. Quote Link to comment Share on other sites More sharing options...
XX4me Posted June 20, 2004 Share Posted June 20, 2004 I removed the valve cover and replaced the hollow tubes that go between the head and the valve cover with solid plugs. Had them machined, .365" if I remember right. Removed all the valves and crap under the silver covers. I then ground the hose barb off the silver covers and tapped the hole and installed hex bolts all the way down flush to clean up the covers. Seemed to me injecting air into the exhaust stream would cause the Air Fuel meter to read leaner than it really was. Quote Link to comment Share on other sites More sharing options...
control1 Posted June 29, 2004 Share Posted June 29, 2004 What do you gain when you remove the pair valves?? :???: Quote Link to comment Share on other sites More sharing options...
Red J Posted June 29, 2004 Author Share Posted June 29, 2004 A lot less junk in the way for plugs and valve checks. As well as less complexity overall, and less hot air in the intake tract. The pair valves exist to allow exhaust gas back into the intake, to clean up emissions. Quote Link to comment Share on other sites More sharing options...
XX4me Posted June 30, 2004 Share Posted June 30, 2004 As well as less complexity overall, and less hot air in the intake tract. The pair valves exist to allow exhaust gas back into the intake, to clean up emissions. Actually it's the inverse. The PAIR system pulls fresh air from the air box and allows it to flow into the exhaust. This allows any unburned hydrocarbons a bit more O2 to finish burning. When the engines running a vacuum is created in the PAIR system that pulls in the fresh air that's why some guys hook up their PAIR systems to the crankcase breather to create a vacuum in the crankcase. Supposedly allows better seating of the rings and more HP. Quote Link to comment Share on other sites More sharing options...
Red J Posted June 30, 2004 Author Share Posted June 30, 2004 I stand corrected. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.