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Messages - 70Bonnie

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British Bikes / Re: exhaust chirp
« on: August 17, 2011, 12:47:20 AM »
Head gasket is new, I put it on. No Oil leaks at the gasket. Couldn't get a fit with the push in pipe so I abandoned that idea. I ran it a bit with no pipe and couldn't notice any mechanical noise. I have to go back to it being some irregularity in the pipe. Sound plausible?

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British Bikes / Re: exhaust chirp
« on: August 15, 2011, 02:21:11 AM »
It's a stumper. Same pipes and mufflers. Even swapped in a pair of real Dunstalls off my '72, no change. The chirpy side doesn't idle quite as well as the other. I did a check by squirting carb cleaner through and it doesn't look blocked. It  pulls well when the throttle is opened, carbs are synched.  I haven't swapped out the pipe though. Could unscrew the exhaust pipe adapter and swap a push-in just to test and see if that solves it. Then, as you suggested,  I'll know if it something in the pipe is causing it. Old school....I like my points.  LOL

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British Bikes / exhaust chirp
« on: August 14, 2011, 11:41:37 PM »
Been lurking around for a while and now I need an opinion so I signed up. :-) 1970 Bonneville, no balance pipe, Dunstall megaphone copies, no baffles. Head has been decked and I am using a thicker head gasket. (.080" copper)  Plug looks good, nice tan colour. The right side exhaust has a chirping/whistling sound as it winds down after throttle. Left side is fine.  I wear earplugs so I hadn't noticed it. A buddy riding behind me heard it and let me know. I checked the tappet clearance in the right exhaust and it was tight. Reset to recommended .004 and no change. There is no noticeable loss in power/compression. No strange sound when listening to the engine, it's only noticeable at the muffler. All opinions appreciated.

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