Jet size for aftermarket exhaust and ear shave - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 24 (permalink) Old 09-29-2011, 11:17 AM Thread Starter
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Jet size for aftermarket exhaust and ear shave

For the ear shave, I have read that 142 is a good size. I am looking to buy the necessary parts to do the shave but I intend on putting on a loud aftermarket set of pipes and I am thinking I should go to a 145/8 main jet. What do you guys think? And how about the slow jet? 40? 42?

How does the ear shave and re-jet affect the reliability of the bike?
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post #2 of 24 (permalink) Old 09-29-2011, 11:52 AM
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Depends on the altitude you're at. 142/42 jets are usually for sea-level and near sea-level riders. I doubt you have to go all the way up to a 145, but I'm no expert either.

What's the altitude where you ride?

As far as reliability, I don't think it's affected at all. The only thing that has been mentioned is a bit lower fuel efficiency but increased throttle response and power.
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post #3 of 24 (permalink) Old 09-29-2011, 12:06 PM Thread Starter
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Im going to be riding the bike from NC to AK next summer, the remainder of this year will be spent between GA/IL/RI. I plan to ride in every altitude. Most of the riding will be in NC so just around 1000ft.
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post #4 of 24 (permalink) Old 09-29-2011, 12:13 PM
If only it had 6th gear..
 
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No adverse reliability. Runs better. Hardly use the choke and starts easier...not to mention having to hold on a lil tighter. I don't think you need 145/8's, overkill IMO. Are you running straights? If so maybe then I'd do the 5's but jets that big are used for racing. Also, do you ride highway a lot? Cuz these bikes are loud on HW anyhow because of the high rpm, so with louder pipes you're ears may burn off, lol. I'm not usually below 80 on the HW and I think I'd voluntarily split my skull open with a hatchet if I had to ride straight pipes for any length of time , just sayin'. Anyway, good luck.

Would be cool to have turn-outs on these tho wouldn't it? Then you could Blat around town p-in' off the neighbors along with the HD's and then turn 'em off when you hit the high road, lol
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Mods:
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
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Hmm....she was on the back when we left.... ??

Last edited by DavesVulster; 09-29-2011 at 12:20 PM.
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post #5 of 24 (permalink) Old 09-29-2011, 01:39 PM
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me too

I finally got my bike running yesterday but my throttle seems to be dragging. My ears are shaved and my pipes are dual right side cruizers. I live in Oklahoma so I went by the bike parts store right by my house and it turns out they have jets for $3 so I planned on doing this to help bring some more power back into the guts. I personally was thinking of going the 142 and 40 route and grab some shims from radio shack. My cruising under 40 is fine but it takes to much throttle to get over that so I think a little fine tuning will get it all covered. the 142/40 combo is just what I was thinking but it sounds good for what all you have described too. Hell I want some opinions on that before I even do it haha

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post #6 of 24 (permalink) Old 09-29-2011, 02:14 PM
If only it had 6th gear..
 
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your bike is shaved with stock jets?

Dave

Mods:
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
Tunes

Hmm....she was on the back when we left.... ??
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post #7 of 24 (permalink) Old 09-29-2011, 02:33 PM
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Correct. It came with the shave poorly done, but done. So I redid it cleaning everything up a bit and now I am going to replace my jets and adjust accordingly to see how that makes it feel.

1985 Vulcan 700 - Fenrir

No regrets. Thats my motto, that and everybody wang chung tonight.
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post #8 of 24 (permalink) Old 09-29-2011, 03:58 PM
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I typically ride around 1200-2500 feet, northern part of Georgia. Sometimes I go to TN where it is 6000+ feet. Sometimes to Florida where it is maybe 100 feet.

So...what jets would you suggest?

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1989 Kawasaki Vulcan 750

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post #9 of 24 (permalink) Old 09-29-2011, 04:16 PM
If only it had 6th gear..
 
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Quote:
Originally Posted by Zis44Zero View Post
Correct. It came with the shave poorly done, but done. So I redid it cleaning everything up a bit and now I am going to replace my jets and adjust accordingly to see how that makes it feel.
You'll love it...

Dave

Mods:
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
Tunes

Hmm....she was on the back when we left.... ??
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post #10 of 24 (permalink) Old 09-29-2011, 05:19 PM
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Quote:
Originally Posted by asbrand View Post
I typically ride around 1200-2500 feet, northern part of Georgia. Sometimes I go to TN where it is 6000+ feet. Sometimes to Florida where it is maybe 100 feet.

So...what jets would you suggest?
All of them! lol

I honestly only know what jets I'm supposed to use at near sea level.

People should probably do what I did and try to find someone at the same altitude you're at that has shaved the bike's ears and ask what jets work for them. Might take a while though, questions about jets don't usually get many responses as to which jet for which altitude.

Again, we SHOULD make a chart. But that requires everyone at different altitudes to chime in! Or to have someone knowledgeable enough about the topic.
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