86 knocker is running - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 07-08-2012, 05:01 PM Thread Starter
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86 knocker is running

Here's a video of the "knocker" running. You can hear the knock very well in it.

http://www.youtube.com/watch?v=s7-Ar...ature=youtu.be

Sometimes it sounded like the bottom end, but also sounded like the top end front at times. The rear cylinder seemed nice and quiet. I tried the grambo trick, and it didn't seem to help. I only turned the screw CCW about 1/4 turn. What to you guys think?

Last edited by Jacknh; 07-08-2012 at 07:29 PM.
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post #2 of 10 (permalink) Old 07-08-2012, 05:31 PM
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The cam chain could have slipped a tooth? Wolfie got his back in timing without an engine pull.

Have you used a screwdriver on it? Not that I advise running it really, but using a screwdriver as a stethoscope can help pinpoint the location.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
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Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
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1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

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post #3 of 10 (permalink) Old 07-08-2012, 05:46 PM Thread Starter
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Yeah I did the screwdriver routine. Just can't seem to point it out. Maybe I should try to find a real stethoscope.

Think it's safe to rule out the ACCT, though?
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post #4 of 10 (permalink) Old 07-08-2012, 06:17 PM
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Quote:
Originally Posted by Jacknh View Post
Yeah I did the screwdriver routine. Just can't seem to point it out. Maybe I should try to find a real stethoscope.

Think it's safe to rule out the ACCT, though?
It's way too loud to be an acct (unless it completely failed and your timing is off)

On the right, bottom side of the engine there is the water impeller. Maybe it's breaking down.

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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post #5 of 10 (permalink) Old 07-08-2012, 06:48 PM
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Ouch, sounds like the crankshaft is shot. Complete rebuild needed if your going to keep it.
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post #6 of 10 (permalink) Old 07-08-2012, 07:06 PM
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that sounds just like what my 86 is doing
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post #7 of 10 (permalink) Old 07-08-2012, 07:18 PM Thread Starter
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Okay, I'll look around for an engine and tear this one down and see exactly what we've got here. Thanks for the responses!
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post #8 of 10 (permalink) Old 07-10-2012, 05:49 PM
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Check your valve train and see if a rocker has come off of the HLA, or one of the HLA's has collapsed.
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post #9 of 10 (permalink) Old 07-12-2012, 08:45 PM Thread Starter
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I've got the top end torn down (minus removing valves from the heads.) I see a lot of wear, but nothing to cause a slap like that. I'll post some pics tomorrow.
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post #10 of 10 (permalink) Old 07-22-2012, 11:35 PM
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Did you find any more out? I got an '86 to work on and it has the same exact noise. I will be tearing it down this weekend but wanted to see if you could steer me in the right direction.
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