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87 KZ305LTD can't stay alive
- car5car
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96 Yamaha Royal Star
82 Yamaha Virago 920
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- punisher11b
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- JackImpact
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punisher11b wrote: Are you getting good combustion in both cyclinders? A good check is to see if the exhaust is the same temp at the engine. All the way out is considered 4 complete turns with those carbs. Can you get it to idle without choke at a 1/2 turn or 4 turns on the air screw? If no then you need to adjust your piolets. The ideal screw position is 1.5 turns. If you need to go tighter on the air screw then your jets a little small, if you need to go out to 3 turns to get it to idle then your jet is to big. That's the general sizing rule.
So with no choke and warmed up a bit, idles with screws 2 rotations out. 1.25 was not enough 1.5 was not enough.
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- JackImpact
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punisher11b wrote: That is actually reasonable. As long as you are within 1-3 turns and it idles good, that means your piolet jets should be very close to correct. Can you drive it at all? What are the symptoms if you try and ride it? No power, ect. It's common for the choke to be so rich it will blow unburnt fuel out of the exhaust but the piolets still be correct. I looked but couldn't find It in Your previous posts. Have you checked your valves?
If I give it a lot of throttle fast it gutters out. Its like glugugl off.
I can ride it, ive noticed its a bit unbalanced at lower RPM in low gears
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Make sure your valves are adjusted properly as well, it's easy to adjust those ones but also easy for them to get miss adjusted during normal operation.
Sounds like just some carberator adjustment to be done though.
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- JackImpact
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punisher11b wrote: Sounds like you need to adjust your needle clip position. If you can, raise the needle clip 1 slot up on both carbs and see if that helps. If you can't you may need smaller main jets.
Make sure your valves are adjusted properly as well, it's easy to adjust those ones but also easy for them to get miss adjusted during normal operation.
Sounds like just some carberator adjustment to be done though.
how do I change needle clip position?
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- punisher11b
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- JackImpact
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punisher11b wrote: It's in the slide. Unscrew the top of the carb, invert the slide and drop out the retaining plate and the needle. Then just move the clip.
Done on both, cant test because its 1 am. Cant bother neighbors. Idles a bit lower. Was idling just over 1k, now its just under 1k.
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- punisher11b
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Side note: it gets better with choke now right?
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