Ear Shave Jetting - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 16 (permalink) Old 03-27-2014, 08:30 AM Thread Starter
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Ear Shave Jetting

I have a few questions about the earshave procedure and rejetting. I followed the earshave procedure last summer and rejetted my bike to 142 and 42. The bike runs Ok and definitely has more top end. However, I believe it is running a little rich. When I pull in the clutch the rpms drop very fast. If you beat on the bike it will shift no problem. When I try to drive it "normal" it seems a little sticky when you shift it. It started doing this immediately after the earshave procedure. I also noticed that even in high 80 degree heat the temperature gauge barely moves. I don't know if this is due to less crap sitting on top of the engine and more air flow or a too much fuel so it runs cooler. In either case I am going to rejet again. The stock sizes are 132 main and 38 slow jet. I decided to try 138 main and 140 slow. My question is should I leave two shims on the needle or should I try one or none? Or is this something I'm gonna have to experiment with?
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post #2 of 16 (permalink) Old 03-27-2014, 08:42 AM
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Its going to be something you have to experiment with. Every engine runs just a little different and you have to fine tune for your bike.

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post #3 of 16 (permalink) Old 03-27-2014, 08:46 AM
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Quote:
Originally Posted by M_Angell View Post
Its going to be something you have to experiment with. Every engine runs just a little different and you have to fine tune for your bike.
Ran mine with 140/40 and 2 shims and ran great.

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post #4 of 16 (permalink) Old 03-27-2014, 10:50 AM
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I do not know your elevation. I would never use shims and a main jet change both.

With no exhaust changes, I would probably keep OEM or a 135 main.
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post #5 of 16 (permalink) Old 03-27-2014, 11:18 AM
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Quote:
Originally Posted by wmsonta View Post
I do not know your elevation. I would never use shims and a main jet change both.

With no exhaust changes, I would probably keep OEM or a 135 main.
Yeah, I am curious of what exhaust mods ...if any.

Ear shave = more air ......also Open up Exhaust = Rejet
Ear shave w/Stock Exhaust .....no need to rejet.


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post #6 of 16 (permalink) Old 03-27-2014, 11:20 AM
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Didn't change jets on mine. Stock exhaust.

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post #7 of 16 (permalink) Old 03-27-2014, 02:14 PM
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I'm with M Angell.every bike is different.I've got 140/40,2 shims and screaming eagle mufflers with very little baffle.and my plugs look perfect and the bike runs great.

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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 16 (permalink) Old 03-27-2014, 03:09 PM
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Same jets on mine too. If I ever feel the need to remove and clean the carbs, I may reject the rear cylinder to see if it equalizes the thump I get from the front at idle.

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post #9 of 16 (permalink) Old 03-27-2014, 09:13 PM
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My '03 with 3000 miles on it (pretty sure factory carb setup when I bought it) came with 38/138 jets and factory sealed 1 5/8 turned out air screws. Did earshave with stock exhaust running 38/142 with 2 shims and air screws 2 1/2 turns out. Made bike too lean even with air screws later backed out to 3 1/2 turns and the pipes got a bit yellowed with chalky white plugs so after 500 miles swapped the slow jet to a 42. Pipe yellowing stopped. After 10,000+ miles plugs are a bit dark. Have ordered 140 mains and plan to swap in the next few weeks.

For my bike I suspect 40 or 42 slow jets and 140 mains with 2 shims is the way to go with a stock exhaust.

Update: Got a few thousand miles with the 40/140 setup (2 shims) and plugs look about right, great throttle response. I'll probably remove 1 shim just to see how she runs next time I pull the carbs.

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Last edited by Spencer1; 06-15-2014 at 06:47 PM.
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post #10 of 16 (permalink) Old 03-27-2014, 09:28 PM
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Hay Rottaway....you aint that far away from Dirty Doc....he buys his guns by you....

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