Snow-white plugs after full ear shave - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 42 (permalink) Old 06-27-2018, 12:08 PM Thread Starter
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Snow-white plugs after full ear shave

My 2006 750 Vulcan, having sat idle for a number of years, would not go above 50 mph.
I had intended to leave the bike stock but when faced with the task of removing the carbs to clean, I elected to do the full ear shave.

I cleaned the carbs thoroughly and the bike seemed to run well after reassembly though I suspected lean but didn't get around to a plug chop until yesterday. One new plug in each cylinder and snow-white and bone dry, looking like they had just come out of the box and never been in an engine. Also, the engine has been running a little bit on the hot side with the temp needle just to the right of the little white temp symbol but never into the red zone.

Having read as much as I can find on this forum, I've decided to take out the 132 stock main and put in a 135 main and leave the pilot stock 38. A 40 pilot seems to me to be to big a jump in size.


Any suggestions?

Should I go with a 138 main instead of a 135?

Am I safe on the low end from being too lean with the stock 38?

If I keep the stock 38, how many turns out on the idle screws should I go to avoid being too lean on the low end?

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post #2 of 42 (permalink) Old 06-27-2018, 12:58 PM
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that's exactly what I did after putting the previously recommended 142/42 in there (far far far too rich!)

I now run 138/38, which runs great. I am constantly trying to tune the idle mix screws to eliminate the burbling/popping on decel, but it doesn't bother me too much, I just haven't gotten it dialed in perfect yet
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Earshave+Rejet (38/135) – NGK Iridiums – MCCT Conversion – Slipstreamer S03 Windshield – Custom Extended Backrest – Custom Highway Bars – MOSFET R/R – LED Underglow – Volt+USB In-Dash – Two-Wire & Blue-Wire Mod – Satin Black Engine Paint – Dampers Parts - Jets: Main=99101-393(#132 stock)/Pilot=n424-22 Pilot(#38 stock)
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post #3 of 42 (permalink) Old 06-27-2018, 01:11 PM Thread Starter
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Quote:
Originally Posted by ubertalldude View Post
that's exactly what I did after putting the previously recommended 142/42 in there (far far far too rich!)

I now run 138/38, which runs great. I am constantly trying to tune the idle mix screws to eliminate the burbling/popping on decel, but it doesn't bother me too much, I just haven't gotten it dialed in perfect yet
I was hoping to hear from you. I've read your posts on the subject and was wondering if you had gotten around to doing it.

Therefore, I shall go with the 138 instead of the 135 and leave the stock 38. You likely have saved me a third-time carb removal.

Thankyou!

Wish they made a 39 pilot. Might be just right on the low end, but perhaps the screw adjustment will suffice.

Thanks again!

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Last edited by roadpouring; 06-27-2018 at 01:15 PM.
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post #4 of 42 (permalink) Old 06-27-2018, 02:52 PM
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These carbs get onto the main jet pretty early, maybe 2500-2800rpm.

Looks like a good plan, just read the plugs again after you jet.

Curious about what air filters you went with?
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post #5 of 42 (permalink) Old 06-27-2018, 03:39 PM Thread Starter
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[quote=Spockster;1265013]These carbs get onto the main jet pretty early, maybe 2500-2800rpm.[QUOTE]

Oh!, Good to know. So the 38 pilot only matters below that, so shouldn't be a problem for scorching anything. Right?

Quote:
Looks like a good plan, just read the plugs again after you jet.
I hope so! Yep, will do.

Quote:
Curious about what air filters you went with?
K&Ns conical, right on the carbs.

You were another whom I had hoped to hear from.

Thank you!

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post #6 of 42 (permalink) Old 06-27-2018, 03:52 PM
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What I exhaust?

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post #7 of 42 (permalink) Old 06-27-2018, 03:57 PM Thread Starter
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What I exhaust?

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Stock.

Thanks fer writin'!

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post #8 of 42 (permalink) Old 06-27-2018, 04:17 PM
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ooh wait I re-read my signature and remembered that I did 135, not 138. Then again, 138 vs 135 isn't much, but stock was 132 in mine. I went up one size to 135. 138 would probably be fine, tbh

also worth mentioning that I have one needle shim on each needle, so my overall mix is up one size at the very top of the carb, but is slightly advanced due to the shim as well.

Earshave+Rejet (38/135) – NGK Iridiums – MCCT Conversion – Slipstreamer S03 Windshield – Custom Extended Backrest – Custom Highway Bars – MOSFET R/R – LED Underglow – Volt+USB In-Dash – Two-Wire & Blue-Wire Mod – Satin Black Engine Paint – Dampers Parts - Jets: Main=99101-393(#132 stock)/Pilot=n424-22 Pilot(#38 stock)

Last edited by ubertalldude; 06-27-2018 at 04:21 PM.
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post #9 of 42 (permalink) Old 06-27-2018, 04:25 PM Thread Starter
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Quote:
Originally Posted by ubertalldude View Post
ooh wait I re-read my signature and remembered that I did 135, not 138. Then again, 138 vs 135 isn't much, but stock was 132 in mine. I went up one size to 135. 138 would probably be fine, tbh
I've got both on their way by mail.

So, to be clear, you're using the 135 and it's running great. Right?

Did you test any plugs after the earshave and before you did any jetting?

I'm just wondering if it's possible that mine is running more lean than yours was and if I need to go with the 138.

But the 135 would suit me. Better mpg and I'm not looking for more power.

Thanks for comin' back to let me know about your 135!

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post #10 of 42 (permalink) Old 06-27-2018, 04:41 PM Thread Starter
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Originally Posted by ubertalldude View Post
also worth mentioning that I have one needle shim on each needle, so my overall mix is up one size at the very top of the carb, but is slightly advanced due to the shim as well.

Thanks for that, too.

I have the shims, so I could do it.

Could you describe to me the difference that the shim would make if I were to use it?

In his thread, "Tuning (jetting) Keihin Carbs for the VN 750", Hexadecimus said that "....shims often cause more trouble than good" and that "Shims were the sole cause of poor idle and hot start problems..." on two of his VN750s.

*shrug* So I don't know, I'm listening to you guys and weighing things out.

Thanks much!

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