I have yoshi pipe and K&N LB, and the bike is running rich no matter what I do. At the moment I'm running 130s with zero #4 washers.


Float height is dead on check both when engine is on and off.  Valves are in spec.  Petcock isn't damaged. Running  40 non bleeder pilots. Pilot screw is 3 turns out.


Where could the gas be coming from? Thank you.

2 mm - yea, maybe. but 140 jets and its rich with Pipe and K&N. Something is wrong.
Cool.
Srinath.

Quote from: seshadri_srinath on September 12, 2006, 09:49:35 AM
2 mm - yea, maybe. but 140 jets and its rich with Pipe and K&N. Something is wrong.
Cool.
Srinath.

Like what? The only thing I can think of that would cause it to run rich at 140 is an air leak? Then again I am clueless 

Nah, air leak would make it lean... perhaps the petcock diaphram is damaged and fuel is being sucked in through the vacuum line.  Try plugging the petcock vacuum line and running it on PRI.

It may make it run a little rich, or it could be sucking fuel through the vacum line, or under braking the fuel could overflow and dump fuel into the engine. Make sure your idle screw isn't backed out all the way (it should be arround 2.5 turns out I think)

Also if your needle is shimmed way up, it cause it to run rich at part throttle/mid RPM

Before you start messing with all the other stuff, just set your float height correctly    I've been able to pull the carb bowls without taking the carbs or tank off the bike. It isn't that hard to set the level right, but 2mm isn't much

Quote from: LimaXray on September 12, 2006, 10:31:43 AM
Nah, air leak would make it lean... perhaps the petcock diaphram is damaged and fuel is being sucked in through the vacuum line.  Try plugging the petcock vacuum line and running it on PRI.

Here is a little update. I dropped all the way down to 130 jets. Left cylinder is STILL fouling. I'm putting in brand new spark plugs everytime I change the setup. When I run the engine I'm not revving it, I'm just letting it idle.

I plugged the vaccuum line and ran on prime, Still fouled. So HOW/WHERE is this gas coming from that is fouling my plugs?

I'm at the point where I'm about to sell my GS for a bike that is reliable.

P.S. floats are dead on, vavles are in spec, compression is good. I don' know WHAT else I can do....

OK lets try this - left is fouling - how do you know. Is the plug black and sooty with the soot sorta like a flowery pattern on the electrode and enough to short the spark BTW it will run OK for a few mins with a new clean plug and progressively get bad.
My bet is ... its not. Plug looks wet and smells like gas right.
Problem in that case is electrical. Bad plugs (NGK's right - toss the mofo's first) or bad auxillary ground or bad crank trigger.
Yea - when ever you have any problem you should sell the bike. So you get a new one, and 3000 miles on it and it needs a valve adjustment. Bingo - you're right back at the start.
Cool.
Srinath.

Quote from: seshadri_srinath on September 12, 2006, 12:54:19 PM
OK lets try this - left is fouling - how do you know. Is the plug black and sooty with the soot sorta like a flowery pattern on the electrode and enough to short the spark BTW it will run OK for a few mins with a new clean plug and progressively get bad.
My bet is ... its not. Plug looks wet and smells like gas right.
Problem in that case is electrical. Bad plugs (NGK's right - toss the mofo's first) or bad auxillary ground or bad crank trigger.
Yea - when ever you have any problem you should sell the bike. So you get a new one, and 3000 miles on it and it needs a valve adjustment. Bingo - you're right back at the start.
Cool.
Srinath.

no the plug is black sooty. Yes I'm using NGK's. They are not black and shinny like you suspect.

Yes the bike runs fine then the plugs foul and it stops running.

Quote from: tussey on September 12, 2006, 01:06:59 PM

Quote from: seshadri_srinath on September 12, 2006, 12:54:19 PM
OK lets try this - left is fouling - how do you know. Is the plug black and sooty with the soot sorta like a flowery pattern on the electrode and enough to short the spark BTW it will run OK for a few mins with a new clean plug and progressively get bad.
My bet is ... its not. Plug looks wet and smells like gas right.
Problem in that case is electrical. Bad plugs (NGK's right - toss the mofo's first) or bad auxillary ground or bad crank trigger.
Yea - when ever you have any problem you should sell the bike. So you get a new one, and 3000 miles on it and it needs a valve adjustment. Bingo - you're right back at the start.
Cool.
Srinath.

no the plug is black sooty. Yes I'm using NGK's. They are not black and shinny like you suspect.

Yes the bike runs fine then the plugs foul and it stops running.

OK then can you check the float on the left with the U tube as its running.
Cool.
Srinath.

Quote from: seshadri_srinath on September 12, 2006, 01:15:54 PM

Quote from: tussey on September 12, 2006, 01:06:59 PM

Quote from: seshadri_srinath on September 12, 2006, 12:54:19 PM
OK lets try this - left is fouling - how do you know. Is the plug black and sooty with the soot sorta like a flowery pattern on the electrode and enough to short the spark BTW it will run OK for a few mins with a new clean plug and progressively get bad.
My bet is ... its not. Plug looks wet and smells like gas right.
Problem in that case is electrical. Bad plugs (NGK's right - toss the mofo's first) or bad auxillary ground or bad crank trigger.
Yea - when ever you have any problem you should sell the bike. So you get a new one, and 3000 miles on it and it needs a valve adjustment. Bingo - you're right back at the start.
Cool.
Srinath.

no the plug is black sooty. Yes I'm using NGK's. They are not black and shinny like you suspect.

Yes the bike runs fine then the plugs foul and it stops running.

OK then can you check the float on the left with the U tube as its running.
Cool.
Srinath.

Both floats are  spot on correct while running. Both plugs are still fouling at 130 with no washers.

Would it matter that I don't have the main fuel line plugged in? I'm running the bike off a jug full of gas which is plugged into the RES line and the bike is on PRI.