Runs rough sometimes...... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 16 (permalink) Old 08-03-2011, 09:52 PM Thread Starter
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Runs rough sometimes......

First off let me say thanks to all who contribute their knowledge here, I am a new member and this kind of stuff really helps out a guy like me. I have a 97 VN 750 with about 23K miles. The guy I bought it from said it would run like crap sometimes, but then would be great. It ran great for me the first two weeks I had it, then I couldnt keep it running, then it would be fine. I have added Seafoam and am currently running that in the tank right now, is there any other obvious things I should be checking??? I am new to motorcycles but not new to working on engines so any info would be great.
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post #2 of 16 (permalink) Old 08-03-2011, 11:32 PM
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Garage
what year bike? I just replaced a couple vacuum lines on my 86= big difference.

1986 vn 750 aka "Huck Farley"
42,000 miles
Rick's stator and rr
Tuxedo stator cover mod
pickup coil mod
dampers replaced
agm m/f battery
Harley sportster exhaust, degoated
Hid conversion
splines lubed
custom "vn750.com" grill cover
NGK Iridium spark plugs


acct to mcct mod https://www.vn750.com/forum/showthread.php?t=17917

rekeying locks, https://www.vn750.com/forum/showthread.php?t=7309

stator replacement walkthrough, https://www.vn750.com/forum/showthread.php?t=11369
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post #3 of 16 (permalink) Old 08-03-2011, 11:45 PM
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I would first check the color of the sparkplugs to determine how the carbs are working. They should be light tan or grey. If one or both are black or wet you are running too rich. You may need to adjust the air/fuel mixture. You may have weak plugs or a bad spark plug wire. Iridium plugs work great. The good then bad condition could be a sticking carb float, flooding one carb. If you switch gas stations you may be getting moisture in the gas from one of them. These are my obvious first looks.

JM2001

" Loud Pipes Risk Rights "

2001 Vulcan 750
marbled
TOC upgrade on ACCT
Air/fuel mixture set to 2 1/2 out
rectifier relocated
splines lubed
iridiums
decals removed
upgraded mirrors
Pic up coil mod done
degoated
All LED lighting
Upgraded Mosfet rectifier
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post #4 of 16 (permalink) Old 08-04-2011, 01:14 AM
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If you do need new plugs, get the NGK Iridium DPR7EIX-9.

When you need a new battery get a Maintenance Free- AGM.
This Deka is a good one:
http://cgi.ebay.com/ebaymotors/Deka-...item3eee173adb

The next thing to do after getting the engine running properly is check and lube your rear splines before riding too far.
See fergy`s spline lube link here:
https://www.vn750.com/forum/showthread.php?t=17274

Since you are new to wrenching on motorcycles this link may interest you:
http://www.dansmc.com/MC_repaircourse.htm

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
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
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 #5 of 16 (permalink) Old 08-04-2011, 09:02 AM
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1988 VN750[SIGPIC][/SIGPIC]

Last edited by FlacoLove; 03-25-2013 at 09:00 AM.
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post #6 of 16 (permalink) Old 08-06-2011, 12:48 AM Thread Starter
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Starts good hot, a little rough cold, yes i do use the choke, idle seems alright no noticeable hesitation, tank looks good no rust that i can see. Definitely going to start with a good tune up, have some chugging from the pipes on decel as well. Will change the plugs and try to tune the carbs, manual is on order. Thanks to all for the input, makes things much easier.
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post #7 of 16 (permalink) Old 08-10-2011, 09:29 PM Thread Starter
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Now this damn thing actls like its starving for fuel, idle is very low and doesnt want to stay running. Been riding non stop for a week, just put in fresh gas from a different gas station. This is nothing like it was before. Waiting on my parts to get here for a tune up, I am thinking I have carb issues. The PO said it would do this sometimes and was told that it could be a clogged gas vent tube. Until I get some new parts on this thing, I think I am screwed. Plan on doing electrical checks this weekend. I am running out of riding time here in Washington so I want to fix this quick!! Any other ideas?
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post #8 of 16 (permalink) Old 08-10-2011, 09:39 PM
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look up POOGS... it is sounding like you have a vacume issue fromt he tank.. check you hoses then useing some WD40 check your boots at the carbs... how does it idle?
if this dosn't do ya.. run strait seafoam thru the carbs or pull em and clean them. check and clean your plugs. check all of your ground points ont he beast and then see what you got.
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post #9 of 16 (permalink) Old 08-10-2011, 09:53 PM Thread Starter
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Thats the plan, waiting on my parts, no one seems to carry the iridium plugs. Will have to spend some time on it this weekend....
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post #10 of 16 (permalink) Old 08-10-2011, 10:47 PM
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Quote:
Originally Posted by cizorey View Post
Now this damn thing actls like its starving for fuel, idle is very low and doesnt want to stay running. Been riding non stop for a week, just put in fresh gas from a different gas station. This is nothing like it was before. Waiting on my parts to get here for a tune up, I am thinking I have carb issues. The PO said it would do this sometimes and was told that it could be a clogged gas vent tube. Until I get some new parts on this thing, I think I am screwed. Plan on doing electrical checks this weekend. I am running out of riding time here in Washington so I want to fix this quick!! Any other ideas?
Gas vent tube.... First check the hose off the back end of the tank that goes down by the battery. Some guys have said that they found the end clogged with crap because it is near or even touching the tire. I used A couple of feet of weed whacker line, fed it down the hole by the gas cap until it popped out at the back of the tank. Then two screws and the cap comes apart to check / clean the little check valves in there. Careful, the parts can pop out when you crack it open. You've checked the carb vent that goes into the right side ear? that can be bottomed out against the case and cause fuel issues too. Hope you get er running nice this weekend
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