Bike Runs Terribly After Re-Jetting.... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 12-31-2006, 02:49 PM Thread Starter
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Bike Runs Terribly After Re-Jetting....

I pulled motor, did stator, shaved the ears, re-jetted (40/140F, 40/142R), put on MAC aftermarket pipes, synch'd the carbs, and it runs terribly.

Does not want to rev up, load or no load. I struggled to get to 65mph, don't think it would have gone much faster if I tried.

Idles better than ever, starts instantly.

I don't know if it's too lean or too rich now, but it's bad. Should I have gone ever bigger on the jets due to shave and pipes?

Any thoughts?

Jon

93VN750, under re-construction
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 #2 of 10 (permalink) Old 12-31-2006, 04:26 PM
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What do the spark plugs look like ? They are your jetting meter...

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post #3 of 10 (permalink) Old 12-31-2006, 04:49 PM
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There is also mention of shimming the carb needles in the Verses. Did ya do that too?

Going by what it says in the Verses, you end up needing to shim them nearly 1/4 inch each (2-.126" shims per side).

Pick had mentioned adding 4 shims to each needle, but didn't say what size he used.


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post #4 of 10 (permalink) Old 12-31-2006, 05:05 PM
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What did you do with the vent hose that was behind the right ear?

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post #5 of 10 (permalink) Old 12-31-2006, 05:25 PM Thread Starter
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Quote:
Originally Posted by hyperbuzzin View Post
There is also mention of shimming the carb needles in the Verses. Did ya do that too?

Going by what it says in the Verses, you end up needing to shim them nearly 1/4 inch each (2-.126" shims per side).

Pick had mentioned adding 4 shims to each needle, but didn't say what size he used.
Thanks, forgot, put 2 shims under each needle.

Jon

93VN750, under re-construction
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 #6 of 10 (permalink) Old 12-31-2006, 05:28 PM Thread Starter
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Quote:
Originally Posted by Ironman View Post
What did you do with the vent hose that was behind the right ear?
The vent hose is tied to a coolant line out of sight.

Jon

93VN750, under re-construction
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!!!)
93VN750 is offline  
post #7 of 10 (permalink) Old 12-31-2006, 05:30 PM Thread Starter
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From what I have read, this thing screams lean. The 40/140F and 40/142R, + 2 shims is for ear shave alone. I think that adding an aftermarket exhaust (removing the goat belly) requires more when coupled with an ear shave.

The question is how much and where, jets, needle shims, both??

Jon

93VN750, under re-construction
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!!!)
93VN750 is offline  
post #8 of 10 (permalink) Old 12-31-2006, 10:52 PM
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Quote:
Originally Posted by 93VN750 View Post
From what I have read, this thing screams lean. The 40/140F and 40/142R, + 2 shims is for ear shave alone. I think that adding an aftermarket exhaust (removing the goat belly) requires more when coupled with an ear shave.

The question is how much and where, jets, needle shims, both??

Jon
Hate to say this, but this is some of the fun of carbs. you have to play with them. without an o2 sensor to put in the exhaust to see where your burn lies in, that adds to it. I would start with what was suggested, and go from there.

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post #9 of 10 (permalink) Old 01-01-2007, 01:53 AM
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Again, watch your spark plugs. They will tell you.

Ron from Jersey
2005 VN750
HellFire windshield
Kaw extended backrest
Cobra exhaust
Re-located stator wires
Side bags
15,000 Miles July/2012
It's PAID OFF ! May 2009
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post #10 of 10 (permalink) Old 01-01-2007, 08:59 AM Thread Starter
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I have 8 more shims to play with, I'll order some higher size jets, and begin playing!

Thanks all.

Jon

93VN750, under re-construction
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!!!)
93VN750 is offline  
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