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Old 12-17-2005   #1 (permalink)
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A buddy is rebuilding a 69 Bonneville and has installed new carbs. It starts easy and runs fine but he thinks it idles too fast. He's trying to get it under 1000 RPMs. What's realistic?
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Old 12-17-2005   #2 (permalink)
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Have the carbs re-sleeved. The old Amals suck wind from around the sloppy slides.

A couple of my old Bonnies will do the "plump-plump, plump-plump, thumpa-thump" type idle at about 800 RPM because they have tight carbs, the others I have set at 1,000 RPM or they will falter and die no matter how much balancing and tweaking.
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Old 12-20-2005   #3 (permalink)
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Yes, 800 rpm is possible, it all has to do with the flywheel, so you won't be quite in the H-D class but near enough.
Obviously the engine needs to be in good working in order to achieve this and then only still when it is fully warmed up will it be able to turn over at such low idle without stalling.

I forgot to add that it is also related to the state of tune, that is why I suppose that Paul's other Bonnies won't go that low because they probably have "hot" cams and high compression. But even then 1000 rpm for a vertical twin with relatively heavy flywheel seems quite high to me.


Note : For my 1994 Sprint 1000 rpm is the normal idle speed.once it is off the choke

[ This message was edited by: vik on 2005-12-21 05:07 ]
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