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Random Dead Miss When Cold (Read 77 times)

drums1

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Random Dead Miss When Cold
05/04/11 at 17:21:51

Here's a problem I've been having, and it's getting worse. Whenever the bike is cold--when 1st starting up--I have to turn throttle stop screw almost all the way in to get it to idle. Once running, it has a random dead miss when idling. The RPM's seem to pick up, and the dead miss seems to go away gradually, as the bike warms up. I back off the throttle stop screw about 2 1/2 turns as it warms up, also. Once it gets to operating temp, all seems ok.
I do show some oil leakage around where the head gasket is. I am getting that fixed in about 2 weeks. I'm wondering if this could have something to do with the dead miss? (Like, as motor heats up, things expand and seal up) Or does it sound more like a carb problem?
I am also having the frozen mixture screw fixed at the same time, as this is directly related to the idle circuit.

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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28884 L.A. California Gender:	Re: Random Dead Miss When Cold Reply #1 - 05/04/11 at 19:25:49 I'd have to guess that you're having issues cause the idle circuit is shut down.
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Boofer Serious Thumper Offline Nearly too old. Posts: 1760 N Ms Gender:	Re: Random Dead Miss When Cold Reply #2 - 05/04/11 at 20:47:49 You didn't say where your choke is set when you crank it. I always use first notch on choke or mine won't idle. My idle speed is set high enough to keep the oil flowing. In temps below 40 I have to use full choke. In either case I push in the choke at the first stop sign I come to a mile from my house.
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Routy Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 2280 Winston Oregon Gender:	Re: Random Dead Miss When Cold Reply #3 - 05/04/11 at 23:13:11 Quote: Once running, it has a random dead miss when idling. ------------------------------------------------------------------------ If it really is a "dead miss", I'd be looking for a bad plug, or a weak ign spark.
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drums1

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Re: Random Dead Miss When Cold
Reply #4 - 05/05/11 at 05:58:07

Choke all the way out to start. Throttle stop screw all the way in to start. Again, as it warms up, it gets better, and I'm able to back off throttle stop screw gradually. Choke in about 2 minutes after startup.
I was thinking electrical too, but again, when fully warmed up, it runs fine. If it was something electrical, I would think it would do it all the time. I'm hoping by getting the mixture screw replaced, and another good cleaning will solve the problem. I agree with Verslagen, that it sounds like an idle circuit problem.

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Routy

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Re: Random Dead Miss When Cold
Reply #5 - 05/05/11 at 07:26:39

I'm wondering if it is much different than normal.

When I first start, (full choke) I usually play w/ the throttle a little, kinda like the real bikers do, Grin

then after a few sec, I drop to 1 notch choke while still playing w/ the throttle a bit. After another 30 secs or so, and if I'm lucky, it will idle at 1 notch choke. After another couple minutes it will probably idle w/ no choke,........but I'm usually at the first stop sign by then.
But no way would I adjust the throttle stop screw when not fully warmed up,.....it not there for that purpose.

Anymore, I usually get ready to roar off before ever starting the bike. As soon as I get down to 1 notch choke, I got it on the hind wheel ! Grin

Rich
'07 S40 Blvd stocker, except drilled OEM exhaust and white spacer mod...1/2 (.055)

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Arnold Serious Thumper Offline The dude abides... Posts: 896 Westchester, NY Gender:	Re: Random Dead Miss When Cold Reply #6 - 05/05/11 at 07:34:03 Could the idle jet be clogged?
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drums1

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Re: Random Dead Miss When Cold
Reply #7 - 05/05/11 at 14:58:36

I was thinking that too, but I've rebuilt this carb like, 5 times in the last two years. Most recently, this past winter. The only thing I didn't remove and clean was that dam mixture screw. (It's froze in place with a booged up slot.) Once I get that dam screw out, I can clean and blow out behind it. I'm hoping this solves the problem.

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