New bike, having air and fuel issue - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 111 (permalink) Old 10-12-2015, 07:19 AM Thread Starter
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New bike, having air and fuel issue

Hello group, pretty new hear, I have recently picked up a 1985 vulcan 700, the bike has been well for best use of words "custom" built, I bought the bike as a project as I can't seem to get the bike to properly run. I have had the bike starting and running which adjustment to mixture, but dies shortly after. Reading up here about these bikes I've gathered that the carb jets are pretty maxed out from factory and changing the exhaust or airfilter set up sometimes results in changing the jets. So this bike I have has straight pipes and no air filter box but has k&N filters directly on the carbs. Any recommendations of what I need to check, or things I should do to try and get this "custom" bobber running properly? Thanks in advance
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post #2 of 111 (permalink) Old 10-12-2015, 08:04 AM
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Might need to rejet and possibly clean carbs. Read upon the earshave on the Vulcan verses. Can you get me some close up pics of the rear exhaust where it comes off the head?

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post #3 of 111 (permalink) Old 10-12-2015, 09:09 AM Thread Starter
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Certainly planning on having them properly cleaned, I read about the earshaving, and im kind of thinking they need to be resized because when the bike would start and run you couldn't give it any gas or it would bog out and cut off, the plugs show sign or it running lean as well
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post #4 of 111 (permalink) Old 10-12-2015, 09:13 AM
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Quote:
Originally Posted by Enginewolf View Post
Hello group, pretty new hear, I have recently picked up a 1985 vulcan 700, the bike has been well for best use of words "custom" built, I bought the bike as a project as I can't seem to get the bike to properly run. I have had the bike starting and running which adjustment to mixture, but dies shortly after. Reading up here about these bikes I've gathered that the carb jets are pretty maxed out from factory and changing the exhaust or airfilter set up sometimes results in changing the jets. So this bike I have has straight pipes and no air filter box but has k&N filters directly on the carbs. Any recommendations of what I need to check, or things I should do to try and get this "custom" bobber running properly? Thanks in advance
I guess your buddy that you got this from couldn't figure it out either. That may be why he was finally willing to let you take it off his hands. lol Your only other posting (under Newbie Check-In) doesn't tell us too much about your wrenching and/or riding experience so it will be a little difficult for one of us to tell you exactly what to check or change initially but we will do our best as we always do. If we know you have some experience wrenching on bikes it is easier to direct you. Make sure you tell us all the changes from stock that you are aware of which could be difficult if you are not totally familiar with a stock VN 700. You explained about the filters and pipes already. Do you know what jets are in it at present? They may have been changed previously.

Good luck and post a few more pictures if possible.

and always remember, "Ride until you rot!"
**Really not sure if the Big "C" is back right now
but having to face the fact that this is a lifetime routine
going forward. Five operations done and it still continues.

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post #5 of 111 (permalink) Old 10-12-2015, 09:16 AM
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X2 with Doc. Maybe check fuel flow out of the petcock, but otherwise, I'd say get into the carbs and see what's in there.

What do the plugs look like?

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post #6 of 111 (permalink) Old 10-12-2015, 11:10 AM
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I can say safely that for sea level, open pipes, and an earshave, you need 42 pilots, 142 mains and 2 shims under the needle. With 40 pilots my rear cyl would drop out at idle when warm. Spent a year and 2 carbs figuring that one out.

1986 Kawasaki Vulcan 750
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post #7 of 111 (permalink) Old 10-12-2015, 11:10 AM
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Yes I am curious as a former member here(named Wolfie)and I have been thinking of doing the exhaust like that and would like to see the manifold.sweet bike

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
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post #8 of 111 (permalink) Old 10-12-2015, 11:45 AM Thread Starter
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I Apologize for not mentioning, I have mechanical experience with automobiles both fuel injection and carb, but have only had time to get my hands into a few bikes. Mechanically speaking the motor is stock as far as internally along with the carbs, so still running stock jets. Your correct I'm not exactly sure the original specs and layouts of a stock vn700 to really tell what has been changed and what hasn't. I've been doing my best to read up about it though I've checked fuel delivery and seem to getting plenty of fuel to the carb I truly believe the bike is leaning out honestly based on the plugs seeming burnt, a redish brown tent to them. As far as pictures go I will take some when I get off work to show the pipes placement specifically for those that are curious
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post #9 of 111 (permalink) Old 10-12-2015, 12:14 PM Thread Starter
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Quote:
Originally Posted by thtanner View Post
I can say safely that for sea level, open pipes, and an earshave, you need 42 pilots, 142 mains and 2 shims under the needle. With 40 pilots my rear cyl would drop out at idle when warm. Spent a year and 2 carbs figuring that one out.
Well my bikes located in South Carolina just a short ways from the ocean, so this might be quite useful information, I've been looking online now for a decent place to order jets, figure id get a handful of different sizes and see what works best
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post #10 of 111 (permalink) Old 10-12-2015, 12:26 PM
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Well my bikes located in South Carolina just a short ways from the ocean, so this might be quite useful information, I've been looking online now for a decent place to order jets, figure id get a handful of different sizes and see what works best
Pilots are N424-22 style - I use 42 but your exhaust may even be less restrictive so it may need 44? I got 4 PK Pilot Jet N424 22 42 Kei | eBay

The 142 jets I got were p/n KE019.195 4 PK Main Jet Rnd 142 Keihin | eBay

I got 4 packs because I have 2 VN750s.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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