Jets Again - Sorry!! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
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post #1 of 12 (permalink) Old 02-03-2014, 09:51 PM Thread Starter
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Jets Again - Sorry!!

I know this has been done to death but the more posts I read the more confused I get.
Bought the bike and it had the standard exhaust but with the goat removed and I think I will keep it like that unless there is some reason not to.
I am planning to do the ear shave but with the single larger filter under the tank as per a thread somewhere.
I have the carbs off for a clean and inspect and am running 140/38 jets and wondering if I should change them while apart. If I go to 140/40 is there any adverse affect by jetting to big (not really worried to much about fuel consumption as I will be riding for fun rather than transport)
Have attached a pic of a plug from each cylinder although the fuel lines where pretty loose so may have been sucking air in if that makes a difference.
Is it possible to change jets once carbs are back on the bike?
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post #2 of 12 (permalink) Old 02-03-2014, 10:10 PM
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That left plug looks pretty crusty almost looks like burned oil more than running rich.. Probably running a little rich from that 140 jet. If you're loosing the ears leave the 140 jet and change the 38 pilot jet to a 40. Degoating your ride sometimes may actually hurt the scavenging effect in your exhaust so your stock main jet probably didn't need to be moved up to a 140 (I know you didn't do it, previous owner). But with the earshave you will be pulling more air in and a 42 jet may be a bit too much, it was a hair to big on my bike after my earshave.

You may need a bit larger but I'd start with the 140/40 with 2 shims under the needle.

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post #3 of 12 (permalink) Old 02-03-2014, 10:17 PM
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Quote:
Originally Posted by FoolAmI View Post
That left plug looks pretty crusty almost looks like burned oil more than running rich.. Probably running a little rich from that 140 jet. If you're loosing the ears leave the 140 jet and change the 38 pilot jet to a 40. Degoating your ride sometimes may actually hurt the scavenging effect in your exhaust so your stock main jet probably didn't need to be moved up to a 140 (I know you didn't do it, previous owner). But with the earshave you will be pulling more air in and a 42 jet may be a bit too much, it was a hair to big on my bike after my earshave.

You may need a bit larger but I'd start with the 140/40 with 2 shims under the needle.
Sounds right to me

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post #4 of 12 (permalink) Old 02-03-2014, 11:09 PM Thread Starter
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thanks guys have just ordered a couple of 40's
how thick are the shims each?
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post #5 of 12 (permalink) Old 02-03-2014, 11:17 PM
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Originally Posted by kitecrazy View Post
thanks guys have just ordered a couple of 40's
how thick are the shims each?
Radio Shack #4 washers - maybe $2.00 for 100.


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post #6 of 12 (permalink) Old 02-03-2014, 11:18 PM
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If your main jets have already been changed to 140's you may already have shims under the needles. Stock is no shims.

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post #7 of 12 (permalink) Old 02-03-2014, 11:21 PM
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Originally Posted by WilliamTech View Post
Radio Shack #4 washers - maybe $2.00 for 100.

My local radio shack only had em In a variety pack

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lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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post #8 of 12 (permalink) Old 02-04-2014, 08:20 AM
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Looks rich to me, already.
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post #9 of 12 (permalink) Old 02-04-2014, 08:36 AM
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Quote:
Originally Posted by kitecrazy View Post
I know this has been done to death but the more posts I read the more confused I get.
Bought the bike and it had the standard exhaust but with the goat removed and I think I will keep it like that unless there is some reason not to.
I am planning to do the ear shave but with the single larger filter under the tank as per a thread somewhere.
I have the carbs off for a clean and inspect and am running 140/38 jets and wondering if I should change them while apart. If I go to 140/40 is there any adverse affect by jetting to big (not really worried to much about fuel consumption as I will be riding for fun rather than transport)
Have attached a pic of a plug from each cylinder although the fuel lines where pretty loose so may have been sucking air in if that makes a difference.
Is it possible to change jets once carbs are back on the bike?
I did the single element ear shave, I am running 140/40 with no ill effects, and the plugs are light tan colored.
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post #10 of 12 (permalink) Old 02-04-2014, 09:02 AM
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slimvulcanrider, Tell him how you joined the intakes. Someone on here was asking that question yesterday.

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