I just got done replacing the clutch on my R1100RS and got it put back together, but I now can't make it run right. The right cylinder is dead and I don't know why. What I have checked: Spark - good plug wires (replaced last year) still match impedance plugs - match impedance Valve clearance, there was little or no input valve clearance on right cylinder, now clearances are set correctly. The exhaust side was tight, but not crazy tight. compression: right was 90, left 120 with throttle closed. Right is now 110ish, 120 ish with fast start open, though leak down is faster than with right cylinder - compression is still noticeably weaker on right side. The right cylinder occasionally backfires through the throttle body, though less than when I first tried to start it. The right cylinder blows puffs of air out the throttle body while idling detaching the right fuel injector has no effect on idle, left FI detachment kills bike fast start idle idles at about 1000RPM right cylinder and plug are cold after engine has warmed somewhat spray patterns of both fuel injectors appear good Do I have a sticking valve? Is it possible for the cam sprocket to have slipped out of adjustment? Some background on the bike. A friend of mine had this bike sitting in his driveway for 4 or 5 years without riding it. He gave it to me and I have since replaced the battery, starter, front master cylinder, clutch, brake pads, plug wires, oil, and maybe other things I have forgotten. The bike was running OK last fall/late winter when i put it in my garage (November?), intending to replace the clutch before I rode it again. I remember that last summer the compression on the right cylinder was a bit low (110?) and that it would occasionally backfire on the overrun, so I thought it needed a valve adjustment (it did) but other than that everything seemed just peachy. I did not start the bike up before beginning the clutch replacement a few weeks ago. Yes, it's true that the gas is still 6 months old and, if I thought it would help, I would burn the gas in my slant six pickup (which would probably burn gas from 1962 with no complaints) but the left cylinder doesn't seem to mind the old gas and I don't think old gas is causing the right cylinder to breath backwards... I am just about at the end of my patience for this bike and am considering parting it out to fund its replacement with something reliable - like maybe a BSA... I am willing to pull the right head to see what might be the difficulty, but I am reluctant to continue to throw good money after bad. I am hoping someone might have some insight here as I am still curious to know what it might be like to ride this bike when it's running right. Oh, and I was unable to find any place on the forum where I could post stuff about my RS, but I figured that since the engines are pretty much the same it shouldn't make any difference.