And now for my next stupid question -- Choke Adjustment - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 26 (permalink) Old 09-27-2006, 06:16 PM Thread Starter
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And now for my next stupid question -- Choke Adjustment

Alright, after ditching the idea of setting my idle speed with the use of tools, I went ahead and just "eared" it this evening - seems fine, and is around 1200 rpm. Good to go. But, while doing that, I remembered (now that it's getting cool out) that I've been having trouble with my choke, and want to see if anyone has an idea as to what's happening.

When I close the choke, with the lever between 1/4 to 3/4 closed (i.e., towards me), the engine stumbles...then regains momentum and the rpms increase. I took the slack out of the cable this evening, and am just getting the stumble/delay/rev at the 1/4 setting. The cable is connected to...what, the choke valve? With that also about 1/4 of the way out of the carb, the stumble is happening, ergo it's not just a cable issue.

Am I supposed to do something with the throttle cables when I also adjust the choke?

C
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post #2 of 26 (permalink) Old 09-27-2006, 07:50 PM
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All you should need to do is just take the slack out of the cables. The bike was running OK before yes,no other If it was then this is OK all you did was bring it closer together. Only if the bike was running fine before...........
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post #3 of 26 (permalink) Old 09-27-2006, 07:50 PM
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NO CLUE here... but I would be interested in the answer to this one...

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post #4 of 26 (permalink) Old 09-27-2006, 08:06 PM Thread Starter
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Yep, the bike's running fine. I'd just noticed on cooler mornings over the summer that when I closed the choke, the idle would stumble and sometimes the engine would die. On those a.m.s, I'd just keep the throttle open a little until the bike warmed up some, and then was able to get the choke closed enough (without the stumble) to get the bike all the way warmed up.

So the stumbling thing was going on before I adjusted the cable this evening. I just thought that that would fix the problem, but there's still a little hitch in the girl's gittyup.

C
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post #5 of 26 (permalink) Old 09-27-2006, 08:29 PM
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Mine is great too, at full choke revs fine, when I start to close the choke, at about 1/4 on it starts the stumbling... I wait at this point for the engine to warm up, or I just start out riding and then push it closed while I am riding. It isn't like it's causing problems, just annoying.

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Mods and other stuff:
nat'l cycle deflector shield
final drive splines lubed 8/06
replaced broken speedometer cable (5194 miles) 9/06

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95 S-10 Blazer 187K miles (Black and Silver)
01 Kawasaki VN750 3300+ my miles, 5300+ total miles (Black and Silver)
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post #6 of 26 (permalink) Old 09-27-2006, 09:39 PM
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Quote:
Originally Posted by kait
Mine is great too, at full choke revs fine, when I start to close the choke, at about 1/4 on it starts the stumbling... I wait at this point for the engine to warm up, or I just start out riding and then push it closed while I am riding. It isn't like it's causing problems, just annoying.
Sounds about normal.

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post #7 of 26 (permalink) Old 09-27-2006, 11:45 PM
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It sounds like either the idle adjust or carb sync may be the problem, It seems with choke, the bike is going too rich. The choke is actually not a choke, it is an "enrichener" allowing more fuel to enter the airstream.

Just a guess mind you......

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post #8 of 26 (permalink) Old 09-28-2006, 12:04 AM
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same issue here. I can only use less then 3/4 choke on cool days (75 degs or less) and on cold days (less then 55) i use full to 3/4 to start with and after a few moments i switch to less then 3/4, just kinda ear it, untill i think she is warm.

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post #9 of 26 (permalink) Old 09-28-2006, 01:10 AM
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Hmm, sounds like you all have been spoiled by your fancy computer controlled easy starting new fangled "fuel injection".

Seriously though...what your describing is just normal for a cold carburated engine. My 78 olds did what you describe...so did my 84 RX7, 85 Dodge Pickup, 88 Kawasaki EX500. And my Vulcan does it too.

If it runs fine once it warms up, there is nothing wrong.
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post #10 of 26 (permalink) Old 09-28-2006, 03:40 AM
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I never start moving until I shut my choke off, so I can't say how mine reacts. I know my old bikes wouldn't be friendly until they were warmed up - meaning that you couldn't do any hard accelerating until the bike was warm enough to run with the choke off.

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