Another Idle Adjustment Question - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 24 (permalink) Old 06-24-2013, 04:46 PM Thread Starter
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Another Idle Adjustment Question

My bike has been idling a bit low lately - to the point it sometimes dies when I stop. I tried adjusting the knob some. It seems to help a little but doesn't seem normal.

When I turned the idle up - it idles ok but when I'm riding it acts as if the throttle isn't releasing when I let go (like when I shift gears) - or almost like the choke is in use.

One thing I noticed is when I turn the knob the entire line/hose turns with it - is this normal? (see picture).

I haven't looked too deeply into it yet but wanted to get some opinions.

Thanks in advance
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post #2 of 24 (permalink) Old 06-24-2013, 05:35 PM
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Sounds to me like you just havnt found the sweet spot yet. If its dying when you come to a stop sign (and its already to running temp) your idled too low. If you let off the throttle and its still revving, your idled too high and its still burning the extra amount of fuel left in the carbs. And yes its normal for the cable to spin when you turn the knob. The knob is connected to the cable and on the other end of that fable is a threaded adjusting pin going into the carbs.


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post #3 of 24 (permalink) Old 06-24-2013, 05:42 PM
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Our bike should idle at 1100 rpm. Once you get it to running temp, adjust your idle to this & you should be good.
If your still dying when you come to a stop then something else is not right.
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post #4 of 24 (permalink) Old 06-25-2013, 06:14 AM
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Does anyone know which way (out or in) to turn the fuel mixture screws to make the bike run more lean? Thanks.
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post #5 of 24 (permalink) Old 06-25-2013, 06:19 AM
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I believe to screw out is to add more air hence lean.
In restricts the air hence rich.
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post #6 of 24 (permalink) Old 06-25-2013, 07:56 AM
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Quote:
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I believe to screw out is to add more air hence lean.
In restricts the air hence rich.
Sorry Kanuck, not correct. You would turn the screws in to make the carbs leaner. Factory settings were around 1 1/2 turns out for a leaner engine ( EPA ). We all go to about 2 1/2-3 turns out to make the mixture richer.

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post #7 of 24 (permalink) Old 06-25-2013, 12:05 PM
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Good deal. I always seem to get that one backwards.
Thanks for clarifying.
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post #8 of 24 (permalink) Old 06-25-2013, 07:10 PM
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Question

Haven't got to look at it yet, but mine was idling too high when I got back to town after a hard run on the slab for 15 miles in the heat.

She was slightly warmer than I'd ever seen (just on the right half of the symbol) and I dropped the idle to 1100, then shut her down.

Just went out and started her up, cool, it's idling 500-600, and needs set back up to 1100.

Maybe the adjustment just walked up on it?

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post #9 of 24 (permalink) Old 06-25-2013, 08:17 PM
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on my bike, if the engine is cool, it wont idle at all unless I pull a little choke.. will start quickly, just wont idle.

This is in SW florida, with 90+ days... takes about 2 minutes (maybe less in the heat) to get it to idle with no choke.

when it is idling with no choke, im right at 1100
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post #10 of 24 (permalink) Old 06-25-2013, 08:58 PM
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Quote:
Originally Posted by Spockster View Post
Haven't got to look at it yet, but mine was idling too high when I got back to town after a hard run on the slab for 15 miles in the heat.

She was slightly warmer than I'd ever seen (just on the right half of the symbol) and I dropped the idle to 1100, then shut her down.

Just went out and started her up, cool, it's idling 500-600, and needs set back up to 1100.

Maybe the adjustment just walked up on it?
I highly doubt that. With the way the idle adjuster is setup, the engine would need to be vibrating pretty good for the adjuster to turn on its own. What were the RPM's before lower them to 1100? The bike will run slower when cold then warm. Don't readjust until the bike is at operating temp. If it struggles to stay running or won't start when cold, use the choke. Back off the choke anytime the RPM's climb passed 2000 until it stops climbing or the bike will run on its own w/o choke.

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