Fuel mixture screws? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 07-03-2015, 06:34 PM Thread Starter
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Fuel mixture screws?

My bike is running 4000at warm idle.ive did the ear shave and checked boots for leaks there are none.my choke plungers were sticking but not anymore.can I adjust the fuel mix screws while on the carbs are on the bike? Or should I pop them off and do it.this is the only thing that's stopping me from riding it.
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post #2 of 12 (permalink) Old 07-03-2015, 06:35 PM Thread Starter
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Fuel mix screws are turned 2 1/2 turns out
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post #3 of 12 (permalink) Old 07-03-2015, 06:58 PM
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And yes, you can adjust them on the bike...you should adjust your idle speed when the bikes warm BTW..

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post #4 of 12 (permalink) Old 07-03-2015, 10:49 PM
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Do you know about the idle adjuster knob on the left side of the bike?

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post #5 of 12 (permalink) Old 07-04-2015, 01:34 PM Thread Starter
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Yeah I know about the idle adjuster knob on the side but it will only let idle go up not down.ive turned the knob both ways one way to the right rpms go up but turning to the left does nothing
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post #6 of 12 (permalink) Old 07-04-2015, 01:54 PM Thread Starter
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Thanks knife maker I just didn't know if I had room to get in there with carbs on the bike.i turned the idle screws out from factory while carbs were out for ear shave. I did the ear shave by the sticky.im just ready to ride!!!!
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post #7 of 12 (permalink) Old 07-04-2015, 02:39 PM
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Well...high idles are usually an air leak somewhere...or a too lean mixture. As you did an earshave ....you might need to go up on your pilot jets... But I'd spray the boots connecting the carbs to the cylinders with WD40 first to make are you don't have a leak.

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post #8 of 12 (permalink) Old 02-03-2016, 02:36 PM
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Hard to Start When Cold

Idle Mixture Screws set at 2.5 turns out. No change in difficulty of starting bike when cold. Must keep trying til bike "idles" for a moment, then I can throttle it on up sometimes. Once warm, bike usually starts great. Any direction?

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post #9 of 12 (permalink) Old 02-03-2016, 03:45 PM
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Do you keep the choke full on until it fires and picks up rpm? On a full cold start, and especially after sitting a few days, these engines tend to start and run on one cylinder until the other cylinder starts to get fuel. Possibly from fuel evaporating out of the one carb, or leaning over on the sidestand for days.

On cold starts, I keep the choke full on until the rpm starts to go over 2200-2500, then I back off on the choke to keep it around 2000-2300 until it's warm enough to run. I can hear when the back cylinder picks up, same time the rpm surges.

Even after a ride and then parking 15 minutes, I usually need to use the choke just long enough for it to fire. The engine just seems to cool off quick.

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post #10 of 12 (permalink) Old 02-03-2016, 03:54 PM
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Well, I haven't tried the choke from cold start. Usually the choke causes it to backfire. But I'll try it in the morning. Thank you. I'll let you know how it goes.

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