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Discussion Starter #1
Good Day Forum,

I've recently completely rebuilt both carbs on my 1969 CB350. All went well. Bench sync'd them then sync'd both on bike. Adjusted air/fuel and idle. Remove plug wire one side at a time, (installed dummy plug in cap and grounded) and Ran each cylinder independently....set idle at 1200 on each side. Bike starts first kick and idles perfect on one cylinder. All Good so far....until i run on both cylinders....the idle runs up to over 5000 and will not come down?
Go easy on me.....I'm a newbe and finding my way on these bikes. Any tips or a good brow beating is welcome.....its how i learn!

Thanks Gents...
 

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Been watching one of those u-tube videos? Those guys don't know what they're talking about. Leave the plug wires both attached, it's a waste of time to try to adjust the carbs with one cylinder dead. Back off the idle speed screws until both throttle arms are completely closed, then run the screws back in 3/4 of a turn after the screw touches the carb body. Start the engine and adjust both screws equally in or out to get the desired idle rpm.
 

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Discussion Starter #3
Thanks Mike......that really does make a whole lot more sense to me....I'll give it a try tonight.
Paul
 

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Thanks Mike....it worked! Dialed down the Idle speed screws and have it steady at 1200. Peculiar thing tho.....went for a ride...maybe 5 miles.....was running around 3500 rpm.....rolled up to a stop...clutch in; the idle stays at 3500 and takes about 15 - 20 seconds to come back down to normal idle.??
Vacuum issue?
Spark advance sticking?

Thoughts?
 
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