coastrd, shaved, easy start-- trouble? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 07-22-2011, 11:31 PM Thread Starter
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coastrd, shaved, easy start-- trouble?

I Coastered, did the ear shave- without rejetting, changed the coolant and did a major clean up of rust on the frame, painted it- (as well as the battery box) remounted the stator, cleaned all my nuts and bolts, and electrical, used clear nail polish, sanded and primed the tins, I also had a snapped header stud, I had to remove the front exhaust manifold and heat it with an acetylene torch to get it out, and replace it.

Coastered, Ear Shave, New 50/50 Coolant, Exhaust (sounds as if its leaking?) Slaping sound?

It started great! It started to get warm so.I turned it off to adjust something feeling great, confident. Exited to check the air pressure in the tires.


Excited about riding, I flooded it starting it... battery started to get weak, (all the electrical testing)
Attached the charger, turned off thefuel- let it warm up. Now with all the cleaning products degreasers rust beakers lubricants, new paint, I expected it to smoke. and it did but not much, I found a loose coolant hose under the radiator. There was how ever smoke pouring up off the now tight exhaust, I.let it get warmer listening to the 'slap' that was there before everything, (which I thought was the open exhaust).

So its still there, slapping as it idles 1100 rpm (fuel on) warming up hose tightened, still smoking rev it a few times can hear the carbs behind the K&N filters, check the temp, not even half, fan comes on then she stalls.

I'm terrified, my old man has been behind myback this whole time givingme horor stories of ruined engines. I've put a lot of time and love into this thing, maybe I'm just over reacting.

I'll check all the hoses avalon tomorrow. What might have caused it to stall?

I may need to adjust the carburators, I assume the Clymer manual will give a run down on rich and lean mixes, but the stalling- if there was another leak running onto the header flange, would it have shut down because of coolant pressure?

"Someone once told me that watching the birds fly, made them want to go on a journey."

Last edited by ourselfish; 07-23-2011 at 12:14 AM.
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post #2 of 5 (permalink) Old 07-24-2011, 12:12 AM
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Why did you do the ear shave without rejetting? It's going to run lean. The slapping at idle is probably acct's going bad. Very common. Stalling has nothing to do with coolant. You probably have your carbs out of whack..but I don't know if I'd ride it at all with an ear shave and stock jets.

Also, are you starting with the choke pulled all the way?

Oh, and it could have stalled because the battery died. It doesn't charge at idle

Bike is sold, thanks for the help guys. Ride safe.
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post #3 of 5 (permalink) Old 07-24-2011, 10:34 AM
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I hate to hijack but what kind of seat is that?
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post #4 of 5 (permalink) Old 07-24-2011, 10:56 AM
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Originally Posted by Freedom View Post
Why did you do the ear shave without rejetting? It's going to run lean. The slapping at idle is probably acct's going bad. Very common. Stalling has nothing to do with coolant. You probably have your carbs out of whack..but I don't know if I'd ride it at all with an ear shave and stock jets.

Also, are you starting with the choke pulled all the way?

Oh, and it could have stalled because the battery died. It doesn't charge at idle
thats what I was thinking, you said it stalled when the fan kicked on which would have been a lot more draw on the battery sitting and idling, how old is the battery, what kind and have you charged it lately. if not charge it and have it load tested at autozone or somewhere.

as for the slapping, is it in the front or rear cylinder or both?

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 #5 of 5 (permalink) Old 07-24-2011, 11:24 AM
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If your battery is weak, won`t hold a charge or is more than a couple of years old, change it out for a Maintenance Free- AGM battery. This Deka is a good one at a good price:
http://cgi.ebay.com/ebaymotors/Deka-...item3eee173adb

You can find similar high quality batteries locally too. Yuasa and Sears Die-Hard are a couple of more good brands. Stay away from cheap Chinese junk. Most of it is low quality and won`t last.

The slapping sound could be the Automatic Cam Chain Tensioners (ACCT) as mentioned.

Go to the Vulcan verses and read about the Grambo Trick. Basicly you just screw the little sealing bolt off the end of the ACCT, stick a small flathead screwdriver inside, back the screw off half a turn CCW and let the spring snap back to see if it will apply more pressure on the tensioner. If the noise doesn`t diminish, put the screwdriver back in and apply some pressure Clockwise. If the noise lessens or stops you have a weak spring in the ACCT.

There are several cures ranging in cost from just a few $, up to ~$50 apiece for new Manual CCTs from TOC manufacturing. Try the grambo trick and report your results. We will help you find the right solution. Be careful with the small screw that seals the end of the ACCT. Don`t apply much torque when you put it back in or you will strip out the threads.

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

Last edited by OlHossCanada; 07-24-2011 at 12:20 PM.
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