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Engine sputtering/stumbling @ cruise speed (Read 99 times)

gungho

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Engine sputtering/stumbling @ cruise speed
05/29/08 at 19:43:03

I noticed it this morning on the way to work, and again tonight coming home.

At 45 mph it feels like the engine is kind of stumbling, it isn't very pronounced, just 'feels' stuttery, not enough that I am losing power but still there.

I haven't changed the plug, fuel filter, or air filter yet, will do that when I get back from vacation next week.

I searched for this but the search function doesn't like me Shocked

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Sandy Koocanusa Serious Thumper Offline Don't blame me. I didn't vote for him. Posts: 1878 Bigfork, MT Gender:	Re: Engine sputtering/stumbling @ cruise speed Reply #1 - 05/29/08 at 19:56:13 Make sure you set the "This post was made in the last..." box to "all posts." Search on "petcock." Or "Vac line." There are endless accounts of similar trouble stemming from a faulty petcock, and the remedies are explained well. Happy reading!
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gungho YaBB Newbies Offline Posts: 11	Re: Engine sputtering/stumbling @ cruise speed Reply #2 - 05/29/08 at 20:38:55 Doh!! I found LOTS of things to check now! Thanks!
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28886 L.A. California Gender:	Re: Engine sputtering/stumbling @ cruise speed Reply #3 - 05/29/08 at 20:41:38 So you got it up to 45 constant? and it's stutering? I think if you search surging you'll find something. I think what you need to do is the white spacer mod.
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gungho

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Re: Engine sputtering/stumbling @ cruise speed
Reply #4 - 05/29/08 at 20:55:53

verslagen1 wrote on 05/29/08 at 20:41:38:

So you got it up to 45 constant? and it's stutering?

I think if you search surging you'll find something.

I think what you need to do is the white spacer mod.

Yes that is more like what I'm feeling. It isn't really losing power, or coughing/sputtering, I just didn't know how to describe it. Surging is more descriptive.

I have no trouble getting it up to speed and staying there, just feels 'funny' when I am accelerating and cruising.

I am leaving tomorrow for a week of vacation, I'll be back and work on it next weekend.

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skrapiron -FSO Serious Thumper Offline Instant Human.... Just add coffee.. Posts: 1456 Pittsburgh, Pa Gender:	Re: Engine sputtering/stumbling @ cruise speed Reply #5 - 05/30/08 at 05:09:52 Yes, the white spacer mod is what you need. Look in the tech section about carb tuning. The whole process can be done in less than an hour and your bike will run better than new.
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furious70 Junior Member Offline {insert text here} Posts: 81 Chicago	Re: Engine sputtering/stumbling @ cruise speed Reply #6 - 05/30/08 at 11:39:51 almost certainly lean surging, my wife's bike did it constantly stock. Ran better with the choke out to the first pull, even when warm. I put a 150 jet in it and it's better now, could probably use a bit more.
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