Surge tank question... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 19 (permalink) Old 01-28-2009, 12:17 PM Thread Starter
 
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Surge tank question...

Hello everyone,

I'm new to the forum, thank you for allowing me to participate. I hope I am not doing anything improper with my first post here.

I'm rebuilding a VN750 - 1996. It a really nice bike.
I have a question about the VN750 surge tank and how it affects the carbs. I cleaned my carbs because I had a float valve sticking open, and I am attempting to reinstall them, but I can't (so far) to get the surge tank hoses connected back to the carbs.

So, before going ahead and connecting the surge hoses, I tried starting the bike without them in place, just to see if the carbs were okay. I found it will not start without starting fluid. Then it starts, but will only keep running at high rpms and it also backfires. It runs really bad.

I welcome any comment or suggestions.

Thanks,
Ray H.
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post #2 of 19 (permalink) Old 01-28-2009, 01:06 PM
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Quote:
Originally Posted by Ray_hensley61 View Post
Hello everyone,

I'm new to the forum, thank you for allowing me to participate. I hope I am not doing anything improper with my first post here.

I'm rebuilding a VN750 - 1996. It a really nice bike.
I have a question about the VN750 surge tank and how it affects the carbs. I cleaned my carbs because I had a float valve sticking open, and I am attempting to reinstall them, but I can't (so far) to get the surge tank hoses connected back to the carbs.

So, before going ahead and connecting the surge hoses, I tried starting the bike without them in place, just to see if the carbs were okay. I found it will not start without starting fluid. Then it starts, but will only keep running at high rpms and it also backfires. It runs really bad.

Thanks,
Ray H.

Those boots are a PITA! make sure you have the corrcet one for carb, they are marked F and R. It sounds like you have more problems than a stuck float. If the carbs sat with old gas your enrichment circuit and idle/pilot jets are probably clogged. You may need to completely dissasemble the carbs and soak them in carburetor parts cleaner. You can get at any autoparts store. it is in a gollon can and it has a basket for small parts. Put all the small part in the basket sepaerating the front and rear parts. Put the main body in the bottom and let soak for 2-3 days. Make sure the jets are clear before you install them.


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
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PLEXISTAR 2 WINDSHIELD
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PICKUP COILS GAPPED AT .018"
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ORIGINAL STATOR & R/R 14.5v
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Last edited by lance328; 01-28-2009 at 07:17 PM.
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post #3 of 19 (permalink) Old 01-28-2009, 07:13 PM
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I used some silicone spray lube on the boots and it helps to let parts "slide" by when pushing the carbs in...wipe off the excess when finished. It also helps on the hoses from the carb intakes to the airbox....mine popped right in after lubing it.
good luck and welcome to the forum!

LETS RIDE!! VROC# 26137
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post #4 of 19 (permalink) Old 01-29-2009, 09:21 AM Thread Starter
 
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Thanks to Lance and Dave for the advice..... Yesterday, I was able to get the bike running better. I adjusted the carbs a little leaner than it was before I cleaned them. I also sprayed some WD40 in the throats while it was running. It seemed to help.

I'll have to try the silicone spray lube on the boots. It will be getting on those hose clamps on the boots and tightening them..... that will be the next problem to tackle.

I'll leave this carb on now that it's running better. I have another carb for this bike that I will take my time and rebuild per the advice from Lance. I really appreciate the help gentlemen.

Thank you,
Ray H.
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post #5 of 19 (permalink) Old 01-31-2009, 08:45 PM
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Have you made any more progress? Let us know.


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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post #6 of 19 (permalink) Old 01-31-2009, 08:59 PM
 
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If it's backfiring, it's lean, if it's blowing black smoke, she's too rich.
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post #7 of 19 (permalink) Old 01-31-2009, 09:33 PM
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post #8 of 19 (permalink) Old 02-01-2009, 12:46 AM
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I don`t have any further tech advice for you, but welcome the forum Ray.

Gordon

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

H-D windshield
Relocated R/R
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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 #9 of 19 (permalink) Old 02-16-2009, 03:23 PM Thread Starter
 
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Okay, guys...I have ridden the bike some 3 or 4 miles since last post. It needed to choke full to run well.???? got the fuel /air mixture screws open 3 turns..

Also, I noticed sometime unusual.... if I put my three fingers partially spread over the throat of the carbs (no boot to the surge tank on yet) I get totally different effects. Whith the front carb it speeds up the bike (accererates), but the same 3 fingers over the rear carb intake..... chokes it down? I checked all hoses...and fuel from the tank to both carbs...it check okay.

Anyone have any ideas why?
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post #10 of 19 (permalink) Old 02-16-2009, 03:30 PM
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My guess is that having the boots off really messes up the air intake and will allow 'nasty stuff' in your carbs and also a poor running condition...

'99 VN750 with 8900 miles and growing (3,111 when I bought it 03-22-08)
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