Testing Ear Shave, Rough at high RPM - Page 5 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #41 of 54 (permalink) Old 05-02-2019, 11:36 AM
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Altitude doesn't really come into play until around 5000ft and above.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
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post #42 of 54 (permalink) Old 05-02-2019, 11:41 AM
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I'm at the same altitude, complete ear shave, stock pipes/mufflers, K&N cone filters and running 40/140 no shims, three turns out and runs perfect... but there are differences in these bikes.

"I need yo clothes, yo boots and yo motocycle."- Uncle Bob

Last edited by roadpouring; 05-02-2019 at 11:43 AM.
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post #43 of 54 (permalink) Old 05-04-2019, 07:23 PM Thread Starter
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I tried 40/143 with 1 shim today. I logged 135 miles on this configuration. Idles great, pulls good, cruises poor. When maintaining speed anywhere between 30 and 60 mph, it stutters. This is right around the 1/4 throttle position. At 70 mph, it clears up.

Edit: It seemed worse after slow speeds or stopping. The engine temp was higher (vs 70 mph). This leads me to believe it's rich. I am second guessing the shim. Maybe it doesn't need it?

I logged 38.8 and 38.2 mpg for the trip, with most cruising at 70mph with some at 60-65 mph.

Top speed showed bearly over 100 mph without tucking out of the wind. However, it appears my speedometer loses accuracy at those speeds. GPS matched at 60 and 70 mph, but showed a max speed of 117.9 mph. I was having speedometer issues before, so that's not surprising.

117.9 is pretty decent!


'89 VN750 Bought stock 4/12/18 @ 17805.9 miles $800. Wrecked once. 27454.5+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB. 110/90 Front Tire. Pick-up coil mod. Shindengen MOSFET FH020AA r/r. USB Outlet + Voltmeter. Repainted Metallic Blue w/ new tank bages. Ear Shave (wo/ coasters) 40/140 NO shims 45MPG. MCCT conversion.

Planned modifications:
Custom LED turn signals. Windshield. Highway Pegs. (Possible) ignition adv. Tuxedo Mod. Ignition coil mod.

Last edited by Jason Pittenger; 05-04-2019 at 10:06 PM.
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post #44 of 54 (permalink) Old 05-10-2019, 03:08 PM Thread Starter
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I took the shims out. I am running 40/143, and it ran great on my commute today! I think I'm finally tuned in!

Thank you all for the assistance!


'89 VN750 Bought stock 4/12/18 @ 17805.9 miles $800. Wrecked once. 27454.5+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB. 110/90 Front Tire. Pick-up coil mod. Shindengen MOSFET FH020AA r/r. USB Outlet + Voltmeter. Repainted Metallic Blue w/ new tank bages. Ear Shave (wo/ coasters) 40/140 NO shims 45MPG. MCCT conversion.

Planned modifications:
Custom LED turn signals. Windshield. Highway Pegs. (Possible) ignition adv. Tuxedo Mod. Ignition coil mod.
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post #45 of 54 (permalink) Old 05-10-2019, 07:00 PM
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Quote:
Originally Posted by Jason Pittenger View Post
I took the shims out. I am running 40/143, and it ran great on my commute today! I think I'm finally tuned in!

Thank you all for the assistance!
Uh, there's a 140 and there's a 142.

There's no 143, that I know of.

But... I'm glad it's running good for ya'!

"I need yo clothes, yo boots and yo motocycle."- Uncle Bob
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post #46 of 54 (permalink) Old 05-10-2019, 11:48 PM Thread Starter
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Quote:
Originally Posted by roadpouring View Post
Uh, there's a 140 and there's a 142.

There's no 143, that I know of.

But... I'm glad it's running good for ya'!
Technically there's no 142 either. The one we know of as 142 is actually 142.5. Just like 38 is actually 37.5. This one just happened to be rounded up instead of down.

I guess it would be less confusing to call it 142. I just went with what was actually stamped on it.


'89 VN750 Bought stock 4/12/18 @ 17805.9 miles $800. Wrecked once. 27454.5+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB. 110/90 Front Tire. Pick-up coil mod. Shindengen MOSFET FH020AA r/r. USB Outlet + Voltmeter. Repainted Metallic Blue w/ new tank bages. Ear Shave (wo/ coasters) 40/140 NO shims 45MPG. MCCT conversion.

Planned modifications:
Custom LED turn signals. Windshield. Highway Pegs. (Possible) ignition adv. Tuxedo Mod. Ignition coil mod.
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post #47 of 54 (permalink) Old 05-11-2019, 12:10 AM
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Quote:
Originally Posted by Jason Pittenger View Post
Technically there's no 142 either. The one we know of as 142 is actually 142.5. Just like 38 is actually 37.5. This one just happened to be rounded up instead of down.

I guess it would be less confusing to call it 142. I just went with what was actually stamped on it.
Oh... okay! That's new to me 'cause I've got sets of the progressive sizes of jets and none of them have decimal points or odd numbers. Not disputing what you've found but it's just something I haven't encountered before.

Again, I'm glad you've got it running good!

"I need yo clothes, yo boots and yo motocycle."- Uncle Bob
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post #48 of 54 (permalink) Old 05-26-2019, 08:35 PM Thread Starter
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I thought I was done, but I have one final issue. My bike is gutless above 8000 and will not pass 8500 in 3rd gear. It's nice, in the sense that it's a natural rev limiter, but that's not how it's supposed to act. I feel it's worse now that the weather is warm.

Miles per gallon are good, idle is good, and it pulls strong up to about 7500. There is no hesitation throughout the throttle range. It pops on decel, but I have the coasters still stock. I also get a strong pop on gear changes under wide open throttle. It still needs a little choked to start on warm days.

This all leads me to believe that I should go down a size on the mains, to a 140.

Thoughts?

EDIT: I should clarify that using 4th/5th gear, I was able to hit 105-110 mph. It just dies out at 8500 rpm.


'89 VN750 Bought stock 4/12/18 @ 17805.9 miles $800. Wrecked once. 27454.5+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB. 110/90 Front Tire. Pick-up coil mod. Shindengen MOSFET FH020AA r/r. USB Outlet + Voltmeter. Repainted Metallic Blue w/ new tank bages. Ear Shave (wo/ coasters) 40/140 NO shims 45MPG. MCCT conversion.

Planned modifications:
Custom LED turn signals. Windshield. Highway Pegs. (Possible) ignition adv. Tuxedo Mod. Ignition coil mod.

Last edited by Jason Pittenger; 05-26-2019 at 08:50 PM.
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post #49 of 54 (permalink) Old 05-30-2019, 08:35 PM Thread Starter
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I'm worried that going down to 140s will cause the rest of the riding range to suffer, for the sake of the last 500 rpm.


'89 VN750 Bought stock 4/12/18 @ 17805.9 miles $800. Wrecked once. 27454.5+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB. 110/90 Front Tire. Pick-up coil mod. Shindengen MOSFET FH020AA r/r. USB Outlet + Voltmeter. Repainted Metallic Blue w/ new tank bages. Ear Shave (wo/ coasters) 40/140 NO shims 45MPG. MCCT conversion.

Planned modifications:
Custom LED turn signals. Windshield. Highway Pegs. (Possible) ignition adv. Tuxedo Mod. Ignition coil mod.
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post #50 of 54 (permalink) Old 05-31-2019, 10:50 AM
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Have you considered hitting the kill switch at 8000rpm or so and pulling a plug?

1986 VN750 27k miles
1999 EN500 32k
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