540 BBC running poorly
10-21-2018, 05:40 PM
#1
Registered
Thread Starter
540 BBC running poorly
1991 Cigarette 35 Cafe Racer. Twin 540s built by White in TN. 34 hours since built.
I pulled the motors in August in order to replace both transom assemblies.
Everything is reassembled now. Motors not running well. The motors both backfire through the carburetor if base timing isn't well above 25 degrees, which is way too high.
I pulled all the plugs today. Most look ok, some are white and look almost unused but many are dark, some sooty, and some wet. It seems like they should all look similar, but they don't.
I will attach pics of the plugs shortly.
I pulled the motors in August in order to replace both transom assemblies.
Everything is reassembled now. Motors not running well. The motors both backfire through the carburetor if base timing isn't well above 25 degrees, which is way too high.
I pulled all the plugs today. Most look ok, some are white and look almost unused but many are dark, some sooty, and some wet. It seems like they should all look similar, but they don't.
I will attach pics of the plugs shortly.
10-21-2018, 05:57 PM
#4
Registered
iTrader: (1)
How much dust got in your carbs 
or dist cap ?
or dist cap ?
