The New And Improved Unofficial R65 Forum V2
Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: boxerkerl on June 26, 2008, 11:08:10 AM
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Over the winter I removed the emmission control air injectors on the recommendation of several friends. First, when everything is working properly, what will I have gained, other than losing a few pounds of weight and the ugly piping?
The real problem: the bike ran GREAT before, after it was way lean. On the recommendation of several knowleable folks, I increased the main jet and pilot jet and I thought I was close to getting it right, then I increased the needle jet. Again, I thought it was close, but after long test rides I find one cylinder lean and one rich, along with a lack of power. I did find an air leak on the lean cylinder, and there is less difference in the 2 now. Compression is OK 148/152 psi. Plugs are new. Both needles in middle position. I'm borrowing a timing light to check timing, but it was (seemed) OK before removing the air injectors...so before I replace all the original jets and start over, I'd like to hear from guys who have removed the air injectors, and how you got your bikes to run right afterward.
Thanks in advance!
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I've not had to re-jet after pulling the smog hoses on three bikes I have done.
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You don't say so It begs the question: How did you plug up the holes left in the head & Airbox? Also did you plug the vacuume takeoff ports at the carb? Maybe silly questions but like I said above :)
rich
who has a perfectly operating fresh air system on his bike.
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Wuss!
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Wuss!
I prefer purist! Now go change out some old light bulbs for the energy saving ones to atone for your carbon sins! :)
rich
BTW I do agree with Justin, no carb fiddling should be needed!
http://www.webbikeworld.com/Motorcycle-technical-articles/pulse-air/
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I still have my air system in place, though the more I take the airbox off the more I think about getting rid of all that snorkely gear in there - also makes removing the
carb bowls easier. I agree with all the above, that air injector system should not have any significant effect on your mixture - the air is injected at the exhaust valve port
and not into the combustion chamber for ignition. Without all that snorkely valve stuff crammed into the airbox, you will have slightly greater air-flow to the carb horns, but I
cannot imagine it is that much difference with the low vacuum the Bings pull while running, MAYBE need a very slight tweak to the air mixture screw at most, I should think.
Do you have non-stock exhaust on the bike ? Normally, folks set the air/fuel mixture screw approx 1/8 turn or so to the rich side from the point where it is too lean
such that it stumbles a bit upon starting to crack open the throttle from idle, as a starting point. A high-flow exhaust system can cause the system to run leaner.
That air leak you found can certainly greatly impact the mixture. Did you adjust the valves before tweaking the carbs ? The points about how well you plugged up the carb and cylinder head holes is also important to note, too !
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Have you looked at this article?
http://www.webbikeworld.com/Motorcycle-technical-articles/pulse-air/
Ed
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Hew guys, thanks for all the replies. I thought I would get email not. like another board, but...
I plugged the holes with a kit I bought at Re-Psycle.
Re-jetting was a goose chase started by a well-meaning friend.
I thought the bike was running pretty well before taking the pipes off and thought just screwing with the mixture should fix it. BUT I found loose valves, timing WAAY off, one of the airpipe plugs had loosened up, float levels not right...and the real cuplrit: semi-plugged idle jets.
I went back to original all jets except I left the the 148 main jet in. Carbs balanced OK, after a couple hours hard riding the carbon from so much idling during all the attempts to sync carbs burned off, it runs smooth and quiet.
Thanks again,
Rick
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Congratulations!
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...Re-jetting was a goose chase started by a well-meaning friend. Rick
Hey, what are friends for anyway? Does friend ride a Beemer? Wrench on 'em?
Don't get mad, get even. Use his name and address to start filling out junk mail requests for insurance, Russian brides, religious tracts, penis enhancement drugs... you get the idea. [smiley=ROTFLMAO.gif]
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Late to the game but all I did was reset the idle mixture with a Colortune plug installed, put the regular plugs back in and off. No problems there...