What did i do?!!!??? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 03-25-2010, 11:21 AM Thread Starter
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What did i do?!!!???

I may have cuased a problem with my carbs i started tinkering with the idle air knob and then my bike started running like crap then quit alltogether and now the knob is so far out of wack it wont start is there a starting point for the idle air knob or am i mechanic bound?
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post #2 of 8 (permalink) Old 03-25-2010, 01:09 PM
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Are you talking about the idle speed knob on the left side of the bike, or the actual idle air/fuel mixture screws? Jerry.

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1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
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post #3 of 8 (permalink) Old 03-25-2010, 01:20 PM
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Or the sync screw?

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post #4 of 8 (permalink) Old 03-25-2010, 01:54 PM
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I'd suspect you made it either way too rich or lean - if you're talking about the plastic knob on the left side. Why were you monkeying around with it anyway?

If you can get the bike started, you might try holding the throttle and reving it up around 2-3k rpms. Once the bike is somewhat warm just start turning the knob and letting off the throttle to see where it's idling. (Make sure your choke is off for this part.)

If the bike dies, you can turn the knob to increase the idle speed. Start it up, let go of the throttle, and see where the idle is.

Or if the bike continues to idle above 1K, (i.e., when you let go of the throttle, the bike continues to idle 2-3k rpms), just screw the knob back down to an acceptable 1k idle. . .

The online manual can tell you how to turn the knob to increase or decrease idle. I can't remember it offhand.

**
Of course if you messed with the small brass air idle screws on the sides of the carbs, you can just screw them all the way in, then out 2.5-3 turns as a starting point.

**
If you messed with the bolt head/screw slot thing that sits at the very bottom between the carbs, do a search for "balancing carbs" and for how to make yourself a $5 carb balancing tool out of clear vinyl tubing, excess oil, and a stick.

Let us know what's up.

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post #5 of 8 (permalink) Old 03-25-2010, 06:07 PM
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Quote:
Originally Posted by skalding View Post
I'd suspect you made it either way too rich or lean - if you're talking about the plastic knob on the left side.
Isn't the plastic knob adjuster only an adjustable mechanical stop of the throttle linkage? i.e., doesn't effect rich / lean but position of throttle at idle?

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post #6 of 8 (permalink) Old 03-26-2010, 02:17 PM
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Yep - you're right. Brain cramp on my part.

Same walkthough to adjust the idle speed though.

Scheherazade
'86 VN750
MF Battery, Iridium Plugs, RR relocated, Voltmeter, 170/80/15 Kenda Kruz rear tire, DIY Samsonite hard bags, DIY shaved seat with Beaded seat pad ('cause that's how I roll) and the dreaded STATOR CHANGE.

Shining Black Bess '86 VN750, retired for parts after a fried stator and being knocked (kee-runch) in her parking spot.
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post #7 of 8 (permalink) Old 03-29-2010, 02:58 PM Thread Starter
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I do'nt know why i monkey around with these things i just cant help my self anything i buy i have to tinker withit until i break it and have no choice to fix it or just completly rebuild it for no reason at all. still just a little boy at heart i guess
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post #8 of 8 (permalink) Old 03-29-2010, 02:59 PM Thread Starter
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i got her running and running better than ever it was just the idle air on the left side of the bike i also removed all my cali emission control crap and she is runnin like a scalded dog now thanx for all the advice
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