Posted by Alan Martinson on February 25, 2008 at 13:05:02 from (24.131.157.149):
I've just installed a new manifold on a 1945 H. Since then, I have not been able to control the idle speed. The engine races at almost top speed regardless of the speed lever setting. I've read a lot about this issue on this forum but still have not solved my problem. Here's what I've done: As I reinstalled the carb, I made sure the governor throttle shaft fit into the carb. I lowered the carb off the manifold to make sure the butterfly moves when I move the speed control lever. I retightened the manifold bolts. I've looked at the governor adj screws and springs. All seems to be per the manual. Everything moves freely in the gov. and throttle shaft area. At one point, I could tap on the gov. throttle shaft and the eng.speed would drop. Then it would creep right back up again. Now, after removing the carb several times to check things, even the tapping won't lower the speed. I've disassembled the carb, soaked parts and put it back together. No change. The engine starts and runs great - just the idle speed. If I turn the idle throttle stop screw in, the speed will increase slightly. I back it off almost all the way and the speed drops a bit but still very high. I believe I did something as I lowered the carb the first time off the old manifold - but I can't see what. This engine ran great before I "fixed" it with the new manifold. Any ideas?
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