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stalling when warm, black smoke on startup

  • Thread starter Thread starter Guest
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Just adding my ten cents worth.

How many turns have you wound out the pilot air screw? I know the book says 1? turns as per most other carby's but I recently rebuilt mine and suffered popping and a rough idle. My best position was 3/4 out from full in. That's about as far in as you want to go but I was lucky and the 3/4 mark nailed it for me. I was running out of adjustment! Anyway, I completely agree with Pacman that you have a lean mixture. I went for a ride with a screw driver and continuously adjusted the screws every 500 meters or so. That helped to speed up the adjustments a bit.

Scott.
 
Good catch, I forgot to ask about the idle air screws. Mine are all right around 3/4 turns as well.

Chris


redscott33 said:
Just adding my ten cents worth.

How many turns have you wound out the pilot air screw? I know the book says 1? turns as per most other carby's but I recently rebuilt mine and suffered popping and a rough idle. My best position was 3/4 out from full in. That's about as far in as you want to go but I was lucky and the 3/4 mark nailed it for me. I was running out of adjustment! Anyway, I completely agree with Pacman that you have a lean mixture. I went for a ride with a screw driver and continuously adjusted the screws every 500 meters or so. That helped to speed up the adjustments a bit.

Scott.
Click to expand...
 
My air screws are anywhere from 3/4 out to 1 full turn out. The fuel mixture screws are anywhere from 1/8th out (I had to punch #2 out as the tip was JAMBED in there, and I mean JAMBED), to 5/8-3/4. All the mixture screws were set by the 'best idle' method. I've thought about buying a plugtune but have heard mixed results about them. I've thought about adjusting the mixture screws out a bit more while riding it but how do you know which one to adjust? or do you just do them all the same amount? I haven't tried the plug pull method yet (it seems too time consuming really). I pulled the airfilter and squeezed a bit more oil out of it (I used a bit too much obviously). Everything in there 'seems' pretty tight.
 
Some guys I know here in KC use the ColorTune and they swear by it. I have seen and ridden bikes before and after they have used the ColorTune on them and it definitely made a difference.

Chris


azr said:
My air screws are anywhere from 3/4 out to 1 full turn out. The fuel mixture screws are anywhere from 1/8th out (I had to punch #2 out as the tip was JAMBED in there, and I mean JAMBED), to 5/8-3/4. All the mixture screws were set by the 'best idle' method. I've thought about buying a plugtune but have heard mixed results about them. I've thought about adjusting the mixture screws out a bit more while riding it but how do you know which one to adjust? or do you just do them all the same amount? I haven't tried the plug pull method yet (it seems too time consuming really). I pulled the airfilter and squeezed a bit more oil out of it (I used a bit too much obviously). Everything in there 'seems' pretty tight.
Click to expand...
 
fixed

fixed

So I go into the timing again and this time check the points with a multitester. Turns out I am getting power to both points at the same time. So there is a short somewhere. I trace it as far as the harness going towards the tach/speedo and figure this could get ugly so I just unplug the two wires white and black and yellow and hook them directly to the coils by splicing them with the two orange wire from the coils and WHAMO!!! no back firing, no bogging, she ran and pulled like I've never seen her before. If I ever get ambitious I will trace down the actual short..maybe.
 
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