earshave problem - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 15 (permalink) Old 05-05-2007, 05:55 PM Thread Starter
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earshave problem

As of my last post i had a spun rod bearing. Got parts motor tore down and back it runs great and decided while it was tore down to do an ear shave. Like i said motor runs great but now when cruising say 55 mile an hour motor is stumbling if i turn the throttle picks up and pulls hard like it should shuts down good. All seems well except for that stumble while crusing. So i was curious about what others with an earshave are running for pilot jets and main jet. Seems to be leaning out and i cant seem to make up the difference with mixture screws. I am running staight out exhaust independent no goat belly or H-pipe. A 145 main jet a 40 pilot jet and #4 position on adjustable needle which is equivilent to stock needle with 2 shims and i beleive i am at 3 1/2 out on mixture screws any help would be appreciated.
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post #2 of 15 (permalink) Old 05-05-2007, 06:03 PM
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The stumble at cruising is not related to the main jet. Remember, it's throttle position that determines where the gas flows from, not rpms.

So if you are crusing at 55 mph, take note of your throttle position, is it 1/8 full, 1/4 full, etc. Then you can take action at the right place.

As a guess, I would think you've got too much needle in it. I tossed my adjustable needles and am running stock needles with one shim. The adjustable needles may not be tapered the same as the factory ones.

I am also only 2.25 - 2.5 turns out on the screws.

Lets us know.

Jon

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Iridium's
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post #3 of 15 (permalink) Old 05-05-2007, 06:20 PM Thread Starter
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yea i didnt want to use the aftermarket needle in the begining started with stock needle with 1 shim then 2 did the same thing only went with 2 because it seems to be leaning out. What size pilot jet are you using.
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post #4 of 15 (permalink) Old 05-05-2007, 06:45 PM
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40 pilot, stock needle with 1 shim (may add another), stock main, about 2.5 out on the screws.

Are you sure it's leaning out? Try adding a little choke, if it improves then you were lean, if it gets worse, you're too rich.

Jon

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Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
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post #5 of 15 (permalink) Old 05-05-2007, 10:59 PM
 
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I had the same problem. Check the boots that contect the carbs to the cylinders. They go in a certain way. There are little tabs on the boots that line up with nubs on the cylinder. I spent a lot of money on stuff I did not need to try and fix it, and that's all it was.
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post #6 of 15 (permalink) Old 05-06-2007, 02:04 PM Thread Starter
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Thanks gang. I changed back to the stock needle with shims and corrected boot position she is running great!!!!
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post #7 of 15 (permalink) Old 05-06-2007, 02:38 PM
 
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Sweeeeeeeet
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post #8 of 15 (permalink) Old 05-06-2007, 03:00 PM
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Can either of you tell me where the projection is on the rear boot as mine must have worn off during the numerous on/off cycles.

Perhaps reference where the part number is stamped into the end, or in relation to the seam.

I don't want to do this again.

Slim - What jetting, how many shims, and what mixture screw turns did you wind up with?

Jon

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vn750.com Member # 828

Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
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post #9 of 15 (permalink) Old 05-06-2007, 04:40 PM
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Originally Posted by slim View Post
Thanks gang. I changed back to the stock needle with shims and corrected boot position she is running great!!!!


AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC


"When life throws you curves,
Aim for the apex."

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post #10 of 15 (permalink) Old 05-06-2007, 06:00 PM Thread Starter
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I ended up with 140 main, 40 pilot, stock needle with 2 shims each. (Stock needle works much better than aftermarket) and 3 turns out on mixture screws. I am pretty sure i originally had an intake leak.
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