Carbs clack like crazy... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 16 (permalink) Old 08-09-2007, 04:54 AM Thread Starter
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Carbs clack like crazy...

Is that normal on older models (mines '86), or any for that matter? A steady tack-tack-tack (about 3 per sec) from both carbs that is very audible. At least I'm fairly sure it's the carbs, can't think of what else it would be and I've had my ear right up against them.

1986 Vulcan 750
Newbie rider (2006) and lovin' it.
Always appreciate bike tips!
r/r relocated, stator replaced (by mech).
My splines are fine!
Kury ISO grips, throttle boss, wide levers and Vista Cruise.
Marbled (copper plumbing caps)
22,392 as of 8/1/07 (about 1,500 are mine)
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post #2 of 16 (permalink) Old 08-09-2007, 07:24 AM
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Sure it's not your cam chain tensioners? They tend to make a pretty steady clacking sound, and are easy to diagnose and repair (always a good thing!).

C
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post #3 of 16 (permalink) Old 08-09-2007, 08:15 AM
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It's the flap that goes up and down. I don't know what it's called. Mine made that same noise when it was struggling.
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post #4 of 16 (permalink) Old 08-09-2007, 10:48 AM Thread Starter
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Cindy, I thought about the ACCTs and have been looking into a manual conversion, but the sound sure seems to be coming from the carbs. I've listened to the sound files posted here but it's not quite the same. I'll find out for sure when I do the conversion, it sure can't hurt. Do you recommend manual or springs?

Tanz1983, it does sound like the vacuum valves, but mine's not struggling at all. It runs great. Fires right up, even when hot. Idles smoothly. Good power through all the gears. Just a slight jetting problem at 4K rpms, but that seems minor. How did yours behave?

1986 Vulcan 750
Newbie rider (2006) and lovin' it.
Always appreciate bike tips!
r/r relocated, stator replaced (by mech).
My splines are fine!
Kury ISO grips, throttle boss, wide levers and Vista Cruise.
Marbled (copper plumbing caps)
22,392 as of 8/1/07 (about 1,500 are mine)
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post #5 of 16 (permalink) Old 08-09-2007, 12:07 PM
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Try the Grambo trick first to see if it helps. It will only take about 10 minutes and costs nothing.

2001 VN750
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post #6 of 16 (permalink) Old 08-09-2007, 02:43 PM Thread Starter
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Yep, already did, doesn't affect it.

1986 Vulcan 750
Newbie rider (2006) and lovin' it.
Always appreciate bike tips!
r/r relocated, stator replaced (by mech).
My splines are fine!
Kury ISO grips, throttle boss, wide levers and Vista Cruise.
Marbled (copper plumbing caps)
22,392 as of 8/1/07 (about 1,500 are mine)
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post #7 of 16 (permalink) Old 08-09-2007, 05:30 PM
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Huh. Could be the vacuum piston after all - have you pulled the carbs ever? Might be worth taking a look to see what's going on in there.

C
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post #8 of 16 (permalink) Old 08-09-2007, 06:32 PM Thread Starter
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I havn't myself but my mech did last year and didn't seem to be worried about it.

1986 Vulcan 750
Newbie rider (2006) and lovin' it.
Always appreciate bike tips!
r/r relocated, stator replaced (by mech).
My splines are fine!
Kury ISO grips, throttle boss, wide levers and Vista Cruise.
Marbled (copper plumbing caps)
22,392 as of 8/1/07 (about 1,500 are mine)
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post #9 of 16 (permalink) Old 08-09-2007, 07:47 PM
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Well, I guess since it's not affecting performance any...may be driving you nuts while riding, but that's another matter! Actually, McKnight has almost 42,000 miles on him (all but 330 of them mine), and there's a crackle or clacking to the engine that I didn't have on my '92 (that only had 11,000 miles on it). I thought it was the exhaust header, but I'm also not having any problems with performance - so it may be just the nature of the vacuum piston beast.

Hyper's got a lot of miles on his baby - maybe he's come to know that sound, too?

C
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post #10 of 16 (permalink) Old 08-10-2007, 02:56 AM
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Can't say I've noticed any sounds that seems to be coming from the carbs.

Have you tried pin pointing the sound with the 'screwdriver to the ear' trick (ask if ya don't know about that, I'd hate to have ya poke an eardrum out!! LOL), or a real mechanics stethescope?
You can really notice where sounds are or aren't coming from that way.


AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC


"When life throws you curves,
Aim for the apex."

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