Has the carb changed from 86-93? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 22 (permalink) Old 01-28-2009, 09:31 AM Thread Starter
 
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Has the carb changed from 86-93?

I have had problems since last summer with a poor running(if it even starts) VN750 -86.
After some suggestions from this forum I took the Carbs apart and cleaned everything but it didn't help.
The last suggestion I got was to change the float valve, which I have been planning to do.
Now I have the oppurtunity to buy a complete carb assembly from a scrapped VN750 from 1993, so I'm thinking why take my apart again if I can buy a newer one and hopefully get rid of my problems?

The question is: Will a carb assembly from a 1993 fit my 1986 VN without mods?
My petcock has PRI-ON-RES if that affect the carbs in any way.
The bike is probably American from the beginning and has since then moved to Belgium and now finally Sweden.

/Tony
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post #2 of 22 (permalink) Old 01-28-2009, 09:57 AM
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The carb assembly part numbers are different at bikebandit.com, but I have no personal knowledge about interchangeability. Those more familiar will probably chime in.

Do you know how the carbs were performing on the other bike, and how long since it ran? Carb problems are very common on bikes that haven't run for a while. Those carbs may need to be cleaned too! Too bad they don't sell Sea Foam in Sweden. That might solve your problem without removing the carbs for cleaning. Have you tried using a locally available carb cleaner that can be added to your fuel? If you haven't, I'd try that first; just follow the instructions on this site about adding Sea Foam to the carbs and fuel. Ask around about what is the best product available to you.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
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1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

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post #3 of 22 (permalink) Old 03-31-2009, 03:28 AM Thread Starter
 
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The carbs haven't changed!

I have finally had the time to change carbs on my bike.
I can now say that a carb from a 1993 VN750 fits a 1986 VN750 without any problems! So as a info to anyone that of some reason needs to change their carb, it seems as they should be interchangeable between the different modelyears.
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post #4 of 22 (permalink) Old 03-31-2009, 04:55 AM
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So did that take care of the poor running problem you mentioned?
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post #5 of 22 (permalink) Old 03-31-2009, 09:21 AM Thread Starter
 
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It seems like it solved the problem.
I haven't been able to ride it yet, still to much sand on the roads here.

After changing the carbs and the battery I started it and the engine runs better than before, no backfire and misfire.
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post #6 of 22 (permalink) Old 03-31-2009, 11:58 PM
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Good to hear you got her fixed, carbs haven't changed since first produced!


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

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post #7 of 22 (permalink) Old 04-01-2009, 02:44 PM
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It`s good to hear you got her up and running good again. Did you just get the bike last summer? The first post sounds like you have been riding for some time and the bike then started acting up. It would be interesting to know why you didn`t find anything wrong with the original carbs when you pulled and cleaned them. Enjoy the new riding season and stay safe.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
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MF-AGM battery
Fiamm Freeway Blaster horns
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Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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post #8 of 22 (permalink) Old 04-06-2009, 02:35 AM Thread Starter
 
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Angry Problem not solved

It still doesn't work!!!

It works at idle but as soon as I turn the handle it dies..
I had a nice 15min walk home when I took a test ride the other day..

I have started to suspect the RR or alternator but don't know what is supposed to be normal.
When the bike idles it reads 13.5v on the battery but I can hear it's not idling alright. Then from time to time it "jumps up" to a higher rpm(3000rpm) and runs ok, then it's around 14v instead.
What is a correct volatage for a idling bike?

OR is it maybe the "new" carbs I put on that are stuck somehow, they have been lying around totally dry for a while before I put them on.

It feel like the bike gets closer and closer to a dealer or the scrapyard...

HELP!


I got the bike 4 years ago for my wife.
It has been OK for a while but started acting strange when we came home from the summer vacation last year.
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post #9 of 22 (permalink) Old 04-06-2009, 03:22 AM
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when the bike died the and u had to walk home was the bat dead? what makes u think its fuel? do you have spark ? how are the plugs and wires? air filters ? just trying to get info, where did your carbs come from? was the 93 from the same elevation ? or did the old bike have an ear shave? did u happen to run her out of gas or lower then "normal"
bad gas caused my bike to die on me once i blew out all the passages and and she fired up ... im thinking your on the right track with fuel but what about the other variables the screen on your petcock is it clean, was there rust in your tank or in the carbs that were clear when u fired it up but when the rust re settled it got pumped into a jet. If she fires try this try pulling a boot off and rev the engine to 3-4k and plug the carb (with your hand) for a half a second. Seafoam (http://www.seafoamsales.com/motorTuneUpTechGas.htm) i dont know what the equivalent is there but there has to be something like it ...can you identify if your issues are both cylinders or just one?



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If u dont have it already Here is the Service Manual
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post #10 of 22 (permalink) Old 04-06-2009, 04:32 AM
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Normal voltage is 12.5, your regulator is working so that is not the problem. I also believe you problem lies with fuel valve "petcock/filter assembly" since you have the same problem with two different carbs. It could also be a clogged fuel cap vent.

Unlock and open the fuel cap with the bike on the center stand. Start the engine and let run for a few minutes, twist the throttle and see if there is any change. If not then proceed below.

Did you drain the tank and put in fresh fuel?
Is the carb vent hose clear and venting to atmosphere?
Have you replaced the vacuum line going to the fuel tap?
Is there fuel leaking from the fuel tap into the vacuum line?
What position do you have the fuel tap lever set on?

If the vacuum diaphram in the fuel tap is bad it will allow little to no fuel to flow with the lever in the "ON" or "RES" position. Open the drains on the bottom of both carbs to see if you have fuel and if it is contaminated.

Set the fuel tap lever to "PRI" which is prime and it will bypass the vacuum diaphram and let fuel flow into the carbs. With Carb drains open and lever on "PRI" fuel should flow until you switch lever to "ON" and carb bowls drain. If fuel does flow you have a problem with the fuel tap "filter/petcock assembly"


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
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