Tap in tank and jet question - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 06-27-2011, 12:16 AM Thread Starter
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Tap in tank and jet question

I have started hearing a tap and while I was looking for the source I put my ear up to the tank and heard it coming through there. I know the carbs are vacuum fed and was wondering if there is something inside that could be tapping. The tap is not always there.

I have also cleaned my carbs out and wanted to know about how far the jets got screwed in. The middle jet in particular. I did not count the turns to put back in the same way. Is there a particular way of doing it? Thanks.
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post #2 of 5 (permalink) Old 06-27-2011, 12:58 AM
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This is pretty crucial from what I know, the jets can be adjusted? Too rich a fuel mixture can scar the cylander walls, by burning off the lubricant, this is what (if I remember right) the clymer manual said anyway.

Clymer Manual m356-5 1985-06, page 252-3 Carburator Service.

"...Changes in (jet needle position) should only be attempted if your experienced with this type of 'tuning' work; a bad guess could result in costly engine damage or, at least, poor performance. If, after servicing the carburetor and making the adjustments described in this chapter, the bike does not perform correctly (and assuming that other factors affecting performance are correct, such as ignition component condition, etc.), the bike should be checked by a dealer or a qualified performance tuning specialist."

Last edited by ourselfish; 06-27-2011 at 01:15 AM.
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post #3 of 5 (permalink) Old 06-27-2011, 10:02 AM
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The "tapping" sound heard coming from you tank could be the air valve located by the rear coil & battery under your seat. Being you don't have any details as weather or not you've coastered or anything I can't say if this could be the culpret.

It looks like this. It has been a "tapping" culpret of many a bike. If you are stock it would probably have to be replaced to fix the tapping sound.

It's part #16126 in the diagram. There really isn't anythin inside the tank it's self that would to the tapping you hear unless your fuel level unit some how came loose. See inside a tank here.

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post #4 of 5 (permalink) Old 06-27-2011, 01:12 PM
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The jets get screwed in until they stop.... There is no adjustment here.

The "air screw" under the lead seal on the outside of the carb is basically a faucet... Turning it in or out changes the amount of fuel in the idle circuit.... But all the internal jets must be screwed in tight...

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post #5 of 5 (permalink) Old 06-28-2011, 12:28 AM Thread Starter
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It was mainly the middle jet that concerned me. There was quite a bit of thread still available but felt as if it was getting tighter. I have the carbs back on the bike and it idles perfect and has been running excellent. I do get some deceleration pops out the exhaust but nothing too bad. Of the middle jet wasn't seated completely, what problems could I expect?

Also the bike is a bone stock 01 750 with 3700 miles on it.

Thanks for all the help guys.

Last edited by 01vulcan; 06-28-2011 at 12:49 AM. Reason: Forgot to add so
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