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post #1 of 6 (permalink) Old 07-10-2007, 12:54 AM Thread Starter
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Choke problem

I'm having trouble with getting my choke to work right. With full choke on the bike wan't to die. If I set it at about 1/3 of the way it works but only goes up to about 1400 rpms if that. It worked fine when I bought the bike but this is one of those cases where the more I rode the bike the more problems (dirty carbs) started happening. So I had to pull the carbs to clean them because of a stuck float valve and while I was doing that I took out the choke valves also and checked those (i don't recommend taking apart the choke linkage - a royal pain to put back together because of the spring). They looked fine, nothing looked broken, rubber all looked good. I don't believe it's too much slack in the cable because, well, there really isin't much. The bike works fine once warmed up, this is just annoying when it's a cold morning.

What could be causing this? Vaccum leak? Carbs out of sync? Although, I did not separate the carbs when I cleaned them, all I did was take out basically everything out of them and blow air through them.

Thanks.

1989 VN750
- 31,XXX mi.
Denver, CO
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post #2 of 6 (permalink) Old 07-10-2007, 07:14 AM
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You may want to double-check your linkage across the two plungers for the choke. I agree, it's a pain to put back together; but there are little parts in there that can mess things up pretty readily. When you move the choke (either forward or back), what's going on with the plungers? Are they both moving? Moving together?

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post #3 of 6 (permalink) Old 07-10-2007, 10:41 AM Thread Starter
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Yeah, I made sure it was working correctly before I put it back on the bike. Plus, it was doing the same thing even before I took it apart.

1989 VN750
- 31,XXX mi.
Denver, CO
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post #4 of 6 (permalink) Old 07-10-2007, 11:14 AM
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If you only blew air through them you might not have actually removed what is causing your problem, if it happens to be the carbs. Have you tried seafoam yet? Are your air filters clean and still in good shape?

Give it a good dose of seafoam, maybe half a can in a full tank, run it for a few minutes to get it in the carb bowls and then let it sit for a day or so. See if that helps. You might have some crud that's restricting fuel flow at idle. When you had the carbs off did you remove your pilot screws (fuel mix screws) and clean out the pilot jets? That's your idle circuit and if it's clogged, you're going to have problems getting it warmed up. Pilot jets are hard to clean without removing the carbs, since the ports are small and it takes a while for seafoam to get in and clean the smallest areas.

Is your idle stable when the engine is warmed up? Does it creep up in rpms at idle? If so you might have a vacuum leak too. Just some questions to help us understand what's going on!

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Spline Lube Procedure, with photos, R/R Relocation and Coil Mod
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post #5 of 6 (permalink) Old 07-10-2007, 11:44 AM Thread Starter
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Yeah I've been doing the seafoam treatment since I got the bike and I'm pretty sure that's what loosened up the crud and made the float valve stick. I still use it now to keep things clean after the carb clean. I removed everything from the carbs, I cleaned them real well. I've done major carb work before on other bikes so I knew what needed to get done once I had the carbs off.

Bike runs perfect when warmed up. Idle does not rise slowly or abruptly stays right at 1200. Both plungers lift correctly when I apply choke, cable is working fine. If I apply choke 1/3 of the way when bike is idling it will stumble then rise a little. If I apply full choke the bike will want to die. Or so it seems.

1989 VN750
- 31,XXX mi.
Denver, CO
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post #6 of 6 (permalink) Old 07-10-2007, 11:52 AM
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When the bike is cold, do you pull the choke on full and try to start it with no throttle? Mine is a little finicky on humid summer days when I start it the first time, but it starts, runs a little sluggishly when it first cranks up, then picks up to about 1500-1700 rpms. I usually push the choke off a little after it picks up rpms and don't keep the choke on for more than about 30 seconds to a minute while I back the bike out of the carport.

In the winter, it will pick up rpms almost immediately on choke when I first start it and I'm continuously rolling off the choke to keep it around 1500 rpms till it's warmed up for maybe 2 minutes.

Fergy
Kyle, TX VN750.com member #707 VROC#19556
2002 VN1500 Classic
Spline Lube Procedure, with photos, R/R Relocation and Coil Mod
Rusty Tank Cleaning!
Electrical Fault Finding Flowchart
SEAFOAM JUNKIE!


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