Testing Ear Shave, Rough at high RPM - Page 4 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

 6Likes
Reply
 
LinkBack Thread Tools Display Modes
post #31 of 47 (permalink) Old 04-11-2019, 01:56 PM
FREEBIRDS MC CENTRAL NY
 
OleDirtyDoc's Avatar
 
Join Date: May 2011
Location: Norwich,NY
Posts: 15,819
iTrader: (0)
     
Garage
Send a message via Yahoo to OleDirtyDoc
Quote:
Originally Posted by VN750Rider/Jerry View Post
Ok ok, I get it. I will stop posting on this topic. I'm still not a fan of it, but to each their own.
You've got your opinions, I have mine and we've been hashing it out for what, ten years now? And I've come back with the same comments every time. If they distroyed engines by letting dirt in, people would not buy them, and if it could be proven, there would be lawsuits. I've seen a lot of people use K&N pods on numerous bikes with none of the Ill effects you state. Like with the UNI's, you need to use filter oil, otherwise they pass dirt through them, just like with the UNI's. The only issues I've seen with K&N pods are damaged pistons from lack of tuning (too lean).

Sent from my A502DL using Tapatalk
roadpouring likes this.

ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

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
OleDirtyDoc is offline  
Sponsored Links
Advertisement
 
post #32 of 47 (permalink) Old 04-14-2019, 06:22 PM Thread Starter
Senior Member
 
Jason Pittenger's Avatar
 
Join Date: Apr 2018
Location: Northern Illinois (Not Chicago)
Posts: 173
iTrader: (0)
 
Garage
Alright, filters on, and it took it for a short ride. It revved better with the filters on (who knew, right? ). Seems like it had decent power. Only issue was a bit of hesitation when applying throttle from cruise. I won't fault it too much. It was 40 degrees and the temp gauge hardly moved during the whole ride (less than 5 miles). I'll check back in once I have a +60 degrees ride on it.


'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
21460.1 miles & counting

Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/143 NO shims 45MPG

Planned modifications:
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance
Jason Pittenger is online now  
post #33 of 47 (permalink) Old 04-24-2019, 11:00 PM Thread Starter
Senior Member
 
Jason Pittenger's Avatar
 
Join Date: Apr 2018
Location: Northern Illinois (Not Chicago)
Posts: 173
iTrader: (0)
 
Garage
Still had a vacuum leak during my last ride. It's fixed now.

I rode across town. It stumbles pretty bad at 4k light throttle. It got better with choke and as the engine warms up. This suggests lean tuning.

I did resync my carb AFTER tonights ride, because I had previously synced with the vacuum leak. Didn't have a chance to ride after syncing.

What should I try next?


'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
21460.1 miles & counting

Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/143 NO shims 45MPG

Planned modifications:
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance
Jason Pittenger is online now  
 
post #34 of 47 (permalink) Old 04-24-2019, 11:11 PM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 6,179
iTrader: (5)
   
Choices: Shim the needles higher or get larger main jets. If you go larger on the mains, you'll still have to adjust the shims.

As engines warm up, they need less fuel.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
post #35 of 47 (permalink) Old 04-25-2019, 07:21 AM Thread Starter
Senior Member
 
Jason Pittenger's Avatar
 
Join Date: Apr 2018
Location: Northern Illinois (Not Chicago)
Posts: 173
iTrader: (0)
 
Garage
Quote:
Originally Posted by Spockster View Post
Choices: Shim the needles higher or get larger main jets. If you go larger on the mains, you'll still have to adjust the shims.

As engines warm up, they need less fuel.
Thanks!

Do I need new seals every time I change jets?


'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
21460.1 miles & counting

Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/143 NO shims 45MPG

Planned modifications:
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance
Jason Pittenger is online now  
post #36 of 47 (permalink) Old 04-25-2019, 11:29 AM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 6,179
iTrader: (5)
   
Quote:
Originally Posted by Jason Pittenger View Post
Thanks!

Do I need new seals every time I change jets?
No, not unless they're damaged or crushed out.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
post #37 of 47 (permalink) Old 04-26-2019, 08:22 PM Thread Starter
Senior Member
 
Jason Pittenger's Avatar
 
Join Date: Apr 2018
Location: Northern Illinois (Not Chicago)
Posts: 173
iTrader: (0)
 
Garage
I pulled the carbs again tonight. It turns out that my carb rebuild kit had the wrong needle in it! It had a D636 when it is supposed to have a N53A. Do you think I should still rejet after correcting the needle? Or should I put it back in and see where I'm at?

Near as I can tell, that wrong needle has a shallower taper starting at a further distance on the needle. That could potentially make it lean all the way across is range. Now that I have the correct needle, should I keep the shim in or take that out? I really don't want to pull the carb again.


'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
21460.1 miles & counting

Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/143 NO shims 45MPG

Planned modifications:
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance
Jason Pittenger is online now  
post #38 of 47 (permalink) Old 04-26-2019, 09:31 PM
Senior Member
 
ubertalldude's Avatar
 
Join Date: Jun 2016
Location: NE Florida
Posts: 632
iTrader: (0)
 
I think I run with 1-2 shims on stock pilots w/ 1-size-up mains, you can probably leave the shim in

additionally, you don't have to pull the carbs to fiddle with the shims, if you take the gas tank off you can access the diaphragm caps from the top

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)
ubertalldude is offline  
post #39 of 47 (permalink) Old 04-27-2019, 04:54 PM Thread Starter
Senior Member
 
Jason Pittenger's Avatar
 
Join Date: Apr 2018
Location: Northern Illinois (Not Chicago)
Posts: 173
iTrader: (0)
 
Garage
I'm back to the correct needles with 1 shim, stock pilots and 138 mains.

I left the surge tank in (just not used) so I have the option to go back to stock. That also means pulling the carbs to change shims. 😞 At least I can pull the carbs in under 1 HR now!

It seems much better, but there is about 2 inches of snow on the ground so riding is out of the question.

Thank you everyone for your help! Time to change my signature by moving Ear Shave to the complete category!


'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
21460.1 miles & counting

Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/143 NO shims 45MPG

Planned modifications:
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance
Jason Pittenger is online now  
post #40 of 47 (permalink) Old 05-02-2019, 10:30 AM Thread Starter
Senior Member
 
Jason Pittenger's Avatar
 
Join Date: Apr 2018
Location: Northern Illinois (Not Chicago)
Posts: 173
iTrader: (0)
 
Garage
Last night I finally burned through the remainder of last September's gas in my tank.
It had Stabil in it, but it was still 8 month old gas.
It had a little bit more power on fresh gas, but it still pops and runs rough at 1/4 throttle.
WOT it's smooth, but doesn't seem stronger than before the ear shave.
I've verified that there are no vacuum leaks.

I'm reading through "Ear Shave Procedure - Enjoy!" and I'm at page 16 so far.
The consensus seems to be 42/142 jets with earshave and aftermarket exhaust, with some reporting the 42s being too rich at idle.
However, the first page of https://www.vn750.com/forum/22-carbs...rbs-vn750.html suggests 38/138 for my setup.

Quote:
Originally Posted by Hexadecimus View Post
1. Start over from stock.
2. #38 pilots with opened screws, or for pods AND pipes AND low altitude consider the BIG 15% jump to #40s, but be prepared to dial your pilot screws way back to compensate for that excessively rich mixture and SKIP SHIMS at this point.
3. Now tune your high end to eliminate any stuttering at WOT under high load and speeds. I've found that most people are best with stock jets for just the ear shave, #138s for intake and exhaust and only occasionally #140. Most people don't need more fuel. Only very rarely and I mean once have I seen a VN750 that actually needed #142s to avoid a lean top end and that's because it did best with #38 and zero shims. I'm still not sure it didn't have another unknown problem because #142 is an excessive 16% more fuel.
4. Re-check your idle and throttle response. It should purr like a kitten even below 1000 RPM and tear up the highway at 100+mph at WOT without skipping a beat. If not, clean your carbs (take them APART and MANUALLY clean everything) and do a full tuneup. Then try again. I don't know of a VN750 with forced induction, so you do NOT need 40/142s or #42 pilots with any mains. If those run better, you have something WRONG with the bike to fix FIRST.
5. Shim only if you have a rough transition. I had one bike that would "surge" a bit only at a 55-65 mph constant speed due to slightly mistuned transition fueling. This is a case where you'd add 1 shim to each needle and test before going to 2. Shims will screw up your low end and idle if it isn't done right.
I'm running 38/138 with 1 shim and 4 or 4.5 turns out on the idle screws.
My exhaust is straight pipes after the GB.
I'm at 850' above sea level.

Is Hexadecimus wrong?
I know everyone says that each bike is different, but I don't see how there could really be that much variance between bikes.

My next try will be 40/140 jets with 1 shim.


'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
21460.1 miles & counting

Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/143 NO shims 45MPG

Planned modifications:
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance
Jason Pittenger is online now  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome