Carb timing issues - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 24 (permalink) Old 08-14-2013, 10:24 AM Thread Starter
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Carb timing issues

Hey all hopefully Im not posting similar issues here but I couldnt quite find what I need searching....

Sooo 96' Vulcan w/ Vance and Hines my carb timing is all messed up. The bike used to run OK but it always seemed like it needed carb work. So I got the manometer and did the syncronization after checking the fuel level according to the Clymer manual. I definitely made it worse. Now I cant go more than 20 mph ha.

According to the previous owner the bike was rejetted bc of the increase of alcohol in gas to 10 % or whatever -- rednecked. this is ridic. its been that way for a while here in DC.

Anyway upon inspection looks here ive got a #132 Main Jet and a #38 Pilot. IS this stock??? Also there are no shims under the jet needle ( that long one with the spring and diaphragm under the top cover)

I feel like to get the bike running correctly it would be easiest to just go back to stock... but I really like this earshave procedure
http://06vn750.blogspot.com/2011/05/...nt-format.html
after taking the damn airbox and carb boots on and off and on and off . those k&n's look sick on the side and seem so much easier to work with. My dilemna is just if I can get it working under normal conditions how can i do the earshave!! If I did follow this procedure can I use all the parts he lists??

Thanks in advance for any advice.. Here are all the Jets listed from Carb Parts on the part diagrams.

Pilot Jet:
92064-1118, #38
92064-1123, #35

Main Jet:
92063-1014, #135
92063-1015, #138
92063-1069, #125
92063-1073, #122
92063-1074, #128
92063-1075, #130
92063-1076, #132

13091-1384, Needle Jet Holder ( threaded piece that holds Main Jet )

O and there was really no fuel gummed up in there, understanding it can be the smallest of things , it doesnt look like anything is wrong with these carbs.

Last edited by GENERA1; 08-14-2013 at 10:28 AM.
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post #2 of 24 (permalink) Old 08-14-2013, 11:45 AM
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I believe the stock size of main jet to be 138, but if you can't run faster than 20mph your not in main jet territory. I have junked the surge tank and emissions equipment and my bike runs fine with 138 mains, 38 pilots and no shims. These carbs are very, very fussy about being clean, that means every tiny little passage way and drilling. Synchronizing and setting the air screws is a waste of time until they are clinically clean, fuel levels spot on float needles sealing 100% and carbs fitted with no air leaks. I spent hours on mine before getting everything as it should be. I am assuming everything else is spot on, i.e. good compression, plugs HLA's etc.

One can never have too many alternative forms of transport.
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post #3 of 24 (permalink) Old 08-14-2013, 12:40 PM Thread Starter
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Cool. Can anyone else confirm the stock jet size before i call up a dealer and get them in? I feel like jets are pretty universal too...most places should have them.
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post #4 of 24 (permalink) Old 08-14-2013, 01:16 PM
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#132=750.
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post #5 of 24 (permalink) Old 08-14-2013, 01:22 PM
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132/32 is stock... no shims...
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post #6 of 24 (permalink) Old 08-14-2013, 03:18 PM Thread Starter
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Wait why is there no #32 pilot jet listed on the parts diagrams if its stock?
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post #7 of 24 (permalink) Old 08-14-2013, 03:35 PM
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Quote:
Originally Posted by GENERA1 View Post
Wait why is there no #32 pilot jet listed on the parts diagrams if its stock?

OEM pilot jet =#38.
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post #8 of 24 (permalink) Old 08-14-2013, 03:38 PM Thread Starter
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O ok. So maybe the previous owner of this bike literally drilled out the jets. But it does not look like that. hmm ,, rejetted my a$$!
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post #9 of 24 (permalink) Old 08-14-2013, 03:54 PM
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Quote:
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O ok. So maybe the previous owner of this bike literally drilled out the jets. But it does not look like that. hmm ,, rejetted my a$$!
Drilling jets is not a good idea, unless you are a machinist. It is possible/sometimes probable you can drill oversize and decrease the gas flow.
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post #10 of 24 (permalink) Old 08-15-2013, 05:47 AM
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The jets are not universal, there are many slightly differing lengths, diameters and thread sizes. Make sure you get the right ones.

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