Stuck on one carb

[Calvin Blackmore]

it would mean that the carb that had its vent blocked would not be able to freely move the main jet whent he trottle is opened and shut as they are diapraghm carbs.

would it not?

maybe I am mistaken but if the carbs are effectively unable to open then wouldnt that cause some fuel to be drawn up into the carb where it would not be properly atomized and drawn into the engine causing a nasty dribble

[dkruitz]

I'm going to go the conservative route and try filling the carbs with that middle air vent hose disconnected to see if the open venting fixes the problem.

[SAN]

carb leak

I had a similar problom on my 81 550T, w/BS32carbs, my #4carb would leak out the air pilot jet. i did a stage 3 jet kit,w/K&N filters. rode it for 200miles the leak started. i had put petcock on reserve filled then retuned to on, same time leak started. after a couple days i put petcock on reserve leak stop never retuned as long as i kept it on reserve. I am replaceing petcock now.before rebuild on carb #3#4 the plug under butterfly shaft were drilled out. only these 2 carbs. bike would barely accept any throttlewith out falling onits face.i pluged these at rebuild no stumble after jet kit and cleaning float #3#4 were set at 22mm before rebuild.SAN

[dkruitz]

Well, we have the flooding fixed we think - it was a venting issue! We removed the vent hose from the #1 carb and it breathes (see above). The two hoses that joined the bowls aren't cross flow tubes but are for the accelerator pump circuit as far as we can tell - seem to put a squirt directly into the throat of the carb.
We tried them this evening with no luck - we think the plugs are fouled as I had put some oil down the cylinders to make sure we had enough oil in there due to the gas contaminating the oil before. We're trying to air that out from possible floodiong, and will fit some new plugs on tomorrow. The frustrating parts is we have had these running decent other than the fact that they overflowed into the motor. stay tuned... :arrow: