TOPIC:

fixer5000 wrote:

hey ron what are you using for fuel lines??? just a thought from an inquisitive guy??? steve

Fuel lines are Motion Pro, made by Tygon. This is about the only thin wall fuel line I know of. I can't stand using high pressure gas hose because it's so dang fat. I've run different hose prior though and still had this problem. Kawasaki fuel line runs about $30 for 10" piece believe it or not

Summary so far -- pure clean air into carb and pure clean fuel into pristine float bowls, with crud collecting in pilot air jets. The query -- from whence does such crud emanate? The clue -- between the float bowl and pilot air jet. The hypothesis -- not from hard parts. The extracurricular -- lavish applications of spray cleaner. The swag -- residue sloughed off from deterioration of soft part(s) such as composite float material, float bowl gasket, float needle base gasket, and/or pilot air screw o-ring. The pornographic memory failure -- no other soft parts come to mind. Please don't give up. We'll fight to the last drop of your blood.

Post edited by: Patton, at: 2006/10/23 15:15

I'm not a carb expert by no means, but are you getting the pilot jets confused with the air mixture screws. The pilot jets do not have a spring behind them. Take the pilot jets out and run a .016 guitar string through them. They build up some kind of crud that even carb cleaner won't get out. I've also heard a number 80 drill bit will work. Hey it worked for me.

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78 650sr
82 550 ltd
72 650 Triumph

No, this bike has the pilot screw adjustments instead of the airscrews. I can remove the pilot screws/springs and spray cleaner in there and it normally fixes the problem for a while. I guess by doing this the cleaner is spraying into the carb as well as backwards through the pilot jets. I've now removed the bank of carbs, carefully cleaned and checked everything, installed the 4 new pilot screws, 4 new inlet rubbers, new fuel line/filter and the motorcycle is running perfect again. The pilot screws were damaged, it was evident by comparing the new ones. One strange thing, when I lightly seat the pilot screws it is noticable that two of them are screwed in farther into the carbs than the other two. I can see the tips of the screws protruding noticably farther out inside the carbs on two of them. So in other words if I lightly seat all 4 and back out x amount of turns 2 of the pilot srews will actually be much different setting than the other two. I backed out all 4 so the tips were flush with the inside of the carbs. What this amounts to is I have 2 backed out about 3/4 turn and the other 2 about 2 turns. Seems to work is all that matters. Someone must have damaged the seats in the carbs a long time ago apparently.
ridgerunner wrote:

I'm not a carb expert by no means, but are you getting the pilot jets confused with the air mixture screws. The pilot jets do not have a spring behind them. Take the pilot jets out and run a .016 guitar string through them. They build up some kind of crud that even carb cleaner won't get out. I've also heard a number 80 drill bit will work. Hey it worked for me.

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78 650sr
82 550 ltd
72 650 Triumph