Klunking out at intersections and stops....

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BeardedLadyManda
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Klunking out at intersections and stops....

Post by BeardedLadyManda » Sat Jun 07, 2014 9:02 pm

Hey guys,

I am having a problem and thought one of two things: 1. I'm an idiot and don't know my bike very well yet; or 2. Some adjusting may be due.

At stops (after the engine is warm and the enricheners are closed {pushed in}) the bike revs down to the point of klunking out! Not only embarassing and damaging to the ego but frustrating. I have to keep the throttle turned just slightly. I had been out on a 45 minute ride when it happened at an intersection....?

Any thoughts?

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Re: Klunking out at intersections and stops....

Post by co_g30 » Sat Jun 07, 2014 9:15 pm

BeardedLadyManda wrote:Hey guys,

I am having a problem and thought one of two things: 1. I'm an idiot and don't know my bike very well yet; or 2. Some adjusting may be due.

At stops (after the engine is warm and the enricheners are closed {pushed in}) the bike revs down to the point of klunking out! Not only embarassing and damaging to the ego but frustrating. I have to keep the throttle turned just slightly. I had been out on a 45 minute ride when it happened at an intersection....?

Any thoughts?

:bow:
If I recall correctly, back in the day when I had a carbureted URAL....I had the same happen to me, the theory is that with warmer weather, there is less oxygen in the air, and the mixture for the carbs is now a bit too rich. (too much fuel)....causing the engine rpm's to drop to the point the engine quits (this is why your rolling on a bit of throttle while stopped kept things going as you were adding air into the mixture). I fixed it by turning the idle fuel mixture screw under the carbs a 1/4 turn CCW with the engine warmed up.

I say the engine warmed up because if 1/4 CCW is not being recalled correctly by me, then you'll immediately see the RPMs drop and the bike die. In that case try CW 1/4 instead. You do this equally on both carburetors of course and if possible balance them with the method of your choice.

HTH

dom
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Re: Klunking out at intersections and stops....

Post by nbsdave » Sun Jun 08, 2014 6:44 am

I may be the least likely guy to give carb advice as I'm dealing with an issue myself.
But, you should not need to use the enricheners this time of year.
I think looking at the idle mixture screws as co said would be a good place to start and maybe your idle is too low.
Not to worry, someone who actually knows what they're talking about will be along soon with good advice.
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Re: Klunking out at intersections and stops....

Post by Albuquralque » Sun Jun 08, 2014 9:26 am

I think step one would be to adjust your idle when the engine is good and warm. Adjust it so the bike idles at 900 - 1000 rpm.

Oh, and make sure you balance your carbs at idle when making the adjustment as well!
Last edited by Albuquralque on Sun Jun 08, 2014 3:20 pm, edited 2 times in total.
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Re: Klunking out at intersections and stops....

Post by rivers » Sun Jun 08, 2014 2:52 pm

Coluralado wrote:I think step one would be to adjust your idle when the engine is good and warm. Adjust it so the bike idles at 900 - 1000 rpm.
x2
You want your idle speed set up for warm normal most in use running condition, not just for during a temporary start/warm up scenario.
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Re: Klunking out at intersections and stops....

Post by Scott » Sun Jun 08, 2014 10:43 pm

I'd be willing to bet you're only running on one cylinder.
Maybe fuel starvation?
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Re: Klunking out at intersections and stops....

Post by Reync » Mon Jun 09, 2014 9:02 am

Check the timing as well. I had a similar issue which I compensated for by increasing the idle with the idle adjustment screw in order to get home. I watched Coluralado's timing video (for a ducati ignition, not sure it's relevant to you) and then adjusted my timing. The idle rpms came back up and I backed the idle screws back out to their original position. Runs like a top now!
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Re: Klunking out at intersections and stops....

Post by BeardedLadyManda » Wed Jun 11, 2014 4:42 am

Thanks for all the suggestions guys!
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tonered
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Re: Klunking out at intersections and stops....

Post by tonered » Wed Jun 11, 2014 12:06 pm

For me, I've found that my seasonal carb adjustment usually requires adding a shim under the needle for summer weather and removing that shim for winter weather. For both of the carb'ed bikes that I've had, that alone was all that was necessary for what felt like a great running motor otherwise.

Beyond that, for all my bikes, a carb / throttle body sync at operating temps fixed many issues that felt like bad air / fuel mixtures, esp near idle RPMs.

Have a good one.
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Re: Klunking out at intersections and stops....

Post by Robert » Fri Jun 13, 2014 9:24 pm

I had the same problem with my bike when first delivered. My simple fix was to screw in the idle screws on both carbies. From memory it took 1 turn. Now I have no issues.
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Re: Klunking out at intersections and stops....

Post by BinDerSmokDat » Wed Jun 18, 2014 7:46 am

+1 for increasing the idle a tad.
Solved identical issue for me.

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