Raw gas blowing out lext exhaust pipe

[sdc1992]

Hello all. Today I put the cleaned and rebuilt carbs back on the 380 for the fourth time and a new problem showed up. with the bike sitting at idle a fog of gas blows out of the weep hole on the left cylinder exhaust pipe. also the left cylinder isn't getting as hot as the middle or right cylinder, seems to not be firing so well. I took the bike out for a quick spin and it was low on power especially takeoff. But while riding I could feel the bike surge and pick up on power but then slack back off. Is this a float issue? I replaced the float needles along with everything in the kits. not replaced the floats though. Also the left carb was the only one that I could not get the pilot jet out of. I ran a very small drill bit through it to open it up. She's got good compression and good spark on every cylinder. any ideas will be greatly appreciated.

Scott

[yeadon_m]

Scott,
Sounds to me like the motor is fine and the carbs work well once you are off the pilot circuit.
The gas leakage will probably be a bad float valve or float or wrongly set float height. Otherwise they cannot get more fuel into the float bowl than is accommodated by the bowl hence no leaks.
On the pilot jet, I'm afraid you will have ruined it. The stock pilot is a #25 which means its 0.25mm diameter. Its very unlikely you still have a jet that size and the cool idle will be due either to a blocked pilot circuit (no or too little fuel) or an over rich mixture (too much fuel). Once the throttle is open beyond 1/4 you are getting different circuits kicking in and the bike picks up.
IMO you cannot leave that pilot in place so I would bite the bullet and risk a few left hand drills and see if you can get it out. I've had success with these VM24 carbs that way. Use the smallest LH drill which will jam in the jet, turn it super slow while holding the isolated carb body very still (ideally in a wooden-jawed 'Workmate'). It may well just snick out.
In any case clean every part of the pilot circuits which are tortuous and also sort any float level issues and away you'll go
Mike

[jabcb]

Just had this problem with a pilot jet on a T350 carb.

Used penetrating oil & let it soak.
Then used a drill bit / extractor bit set. The drill bit enlarges the hole so that you can use an extractor. Then turn the extractor by hand.
viewtopic.php?f=9&t=12382

[sdc1992]

Thanks guys. I ended up just replacing the left carb with a NOS unit that was loaded with all its goodies. I then replaced the other two floats and needles with Suzuki parts. No leaks now and is running on all cylinders. She runs like a demon now Has great take off and pulls strong even in 6th gear.

[pearljam724]

Your cylinders were flooding with fuel. A drill bit was a bad choice to open up a jet. Use something smaller like the finest guitar string next time. Or compressed air. It's extremely common, for rust particles in the fuel tank to cause the same issue. Particles, clog the valve needle. Causing cylinders to flood. It's a must to seal any motorcycle tank that is older than 15-20 years old. Inline filters help, if you use a good one. Some filters have metal screens and the holes are too big. Little stuff still bypasses. It's best to use a filter with a paper element. Nothing will bypass, those.