A little info on Jet size for VN 750 1986 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 09-05-2011, 06:45 PM Thread Starter
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A little info on Jet size for VN 750 1986

Hi again everyone my bike has been earshaved and i need to have her rejetted as at top speed i do about 80mph screaming, i feel theres more power to be had but it doesnt go any further or faster then that sadly.
I am wondering ( as a total novice) what is the correct jet size i should put in my carbs, i would rather get the info of all of you here as your much more knowledgeable about our VN's then a regular mechanic.
I know i need 2 types of jets, some sizes would be great so i can ask my mechanic to order and fit them and all is sorted without having to take it back and get a different size that he could have possibly recommended.
I trust you guys and girls much more then the mechanics around were i live
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post #2 of 5 (permalink) Old 09-05-2011, 07:14 PM
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You'd need to say what your altitude is... I THINK for near sea level 142/42 seem to be a good choice.
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post #3 of 5 (permalink) Old 09-05-2011, 08:33 PM Thread Starter
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Hi i didnt realise that altitude would be a factor for jet size but you learn something new everyday.
I am at sea level, i live in the UK and its pretty much flat here.
Thankyou for the info on sizes.
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post #4 of 5 (permalink) Old 09-05-2011, 08:47 PM
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I'm at sea level, 27 ft (8.2m) to be exact, and running a 42/142 set up without a problem.

1986 Black Kawasaki Vulcan VN750 "Black KAWK"
VN750 #9300 & VROC #33453

EMGO Handlebar, V&H Exhaust, Drop Shocks, Raised/Painted Fork, MeanStreak Seat, Tank Bib, ME880 Oversize Tires, Engine Guard, Custom Mirrors, Chris Products Turn Signals, Ear Shave, 150/42 Jets, PINGEL Fuel Valve, MCCT, Volt Meter, Shendegen R/R, AGM Battery, Coastered, .020 Coils, Relo Gauges & Headlamp, SilverStar Ultra, LED Flashing Brake Light, Center Stand Delete, WOLO Airhorn.
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post #5 of 5 (permalink) Old 09-05-2011, 09:13 PM
If only it had 6th gear..
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40/142 here, north of Boston Massachusetts. Smooth all the rpm range. Had it up to 100 and it had more left to give, so you've got more top end to look forward to when it's done I'd say.


Jetted, shaved & coastered
Home made under-tank single filter
Converted ACCT's to manual (thanks wib714)
Dual vac lines on petcock (my cure for ticking)
LED tail/plate lights
Relocated helmet lock to license plate

Added stuff:
Customized hard bags w/ lights
Chrome levers
Hellcat windscreen
LED running lights
Home made 'Vita-Volt' meter
Foot rests on engine guard

Hmm....she was on the back when we left.... ??
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