Thunk thunk thunk?? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 14 (permalink) Old 08-04-2008, 09:06 AM Thread Starter
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Thunk thunk thunk??

What? That isn't the noise the rear wheel is suppose to make.
Sere is down for a major overhaul, engine pulled to fix a stator cover leak and figured do a spline lube while we're at it too. Engine back together (hate getting that bevel gear up into place ), splines lubed and did the customary spin of the wheel to make sure everything is ok. One spin, three thunks and it sounds like it is coming from the bevel gear.

So before I take the darn thing off again (luckily won't have to tilt the engine for that) anyone have any ideas what to look for? I thought stuff in there was pretty tight enough to where you couldn't put it back together wrong, but something obviously isn't right.
The clutch hasn't been adjusted yet and I did pull the push rod when I had the bevel gear off, but it's a thunk not a grab..
Driveshaft is connected can see it turn, maybe not fully seated into the bevel gear?
Anyone run into this before?

Dianna
Conway, AR
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)
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post #2 of 14 (permalink) Old 08-04-2008, 11:27 AM
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Dianna, here's a link to the same problem I had. https://www.vn750.com/forum/showthread.php?t=5035 It turned out to be the universal in the shaft is my best guess. I bought a shaft off Cindy & it moooved alot more freely than mine. Changed it out, no more problem. By the way I had come home, parked the bike, went out the next morning & thunk! thunk! thunk! I'd guess it's the culprate!
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post #3 of 14 (permalink) Old 08-04-2008, 11:53 AM
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I thunk the same thing that kan69 thinks. I thunk that as I was reading your post. It is probly cocked over to the side instead of in the splines.

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post #4 of 14 (permalink) Old 08-04-2008, 12:20 PM
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Quote:
Originally Posted by niterider View Post
It is probly cocked over to the side instead of in the splines.
I thunk it too...
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post #5 of 14 (permalink) Old 08-04-2008, 12:30 PM
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All this thunking gives me a headache!

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1989 VN750-A5
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-Replaced/Fused Stator & Replaced/Relocated R/R (15K mi.)
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post #6 of 14 (permalink) Old 08-04-2008, 12:30 PM Thread Starter
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Ok, did the detective work, screwdriver to the bevel gear could hear the thunk, screwdriver to the universal, could definitely hear the THUNK.
So I pulled the rear wheel off again, pulled the shaft back and reseated.
Turn and thunk.. pulled back a bit (and still seated) and no thunk.
Well ain't that just dandy!
Ok, problem located at least, now to find out why that thing is pushing forward so much...

Dianna
Conway, AR
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)
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post #7 of 14 (permalink) Old 08-04-2008, 04:24 PM
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I dunno. I replaced mine, doing everything the same, pack with grease ect & my thunk was gone. Same spring even.
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post #8 of 14 (permalink) Old 08-04-2008, 04:44 PM
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Since you guys are pulling the shaft and reassembling the rear cover, maybe someone can give me some info regarding the rear seal. A mechanic friend of mine, last summer noticed streaks of grease on my rear wheel. He convinced me that it was dangeous and talked me into letting him reseal the rear drive with a new gasket. Hundreds of dollars later, there is still grease streaks on the rear wheel. I called Kawi about it and they were very casual about it and told me that sometimes there is excess grease in there and it will continue to leak out until the excess is gone. Spoke to my mechanic friend who insists that there was a recall on this a few years back. Anyone can shed some light on this for me?
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post #9 of 14 (permalink) Old 08-04-2008, 04:54 PM Thread Starter
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Quote:
Originally Posted by kanuck69 View Post
I dunno. I replaced mine, doing everything the same, pack with grease ect & my thunk was gone. Same spring even.
I'm thinking that is the case with mine too. It's not a drive-shaft and universal from my 2000. I had replaced them with used ones out of an 86 with unknown miles. Luckily now I still have my 2000 driveshaft and a brand new coupling.
Gheeesh Louieees! Just wish I would have known about it before the dang engine was back in place!
When I told my husband he said "Yeah that sounds possible.. It could have been making the noise and was just so faint we never heard it until now"
I mean how many times do you spin the wheel with the engine off? Tire changes and lube splines.
Well guess it's nest I found it now instead of half way to Kentucky Lake.
Also found a hairline crack in my right header pipe down by the floorboard. Looks like something gouged it. So I'm going to JB weld a piece of pipe over it.
Luckily that's on the inside.
Thanks and hopefully she'll be back on the road better than before and no stator cover leak (that's how this all started!)

Dianna
Conway, AR
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)
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post #10 of 14 (permalink) Old 08-04-2008, 04:59 PM Thread Starter
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Quote:
Originally Posted by Gemguy View Post
Since you guys are pulling the shaft and reassembling the rear cover, maybe someone can give me some info regarding the rear seal. A mechanic friend of mine, last summer noticed streaks of grease on my rear wheel. He convinced me that it was dangeous and talked me into letting him reseal the rear drive with a new gasket. Hundreds of dollars later, there is still grease streaks on the rear wheel. I called Kawi about it and they were very casual about it and told me that sometimes there is excess grease in there and it will continue to leak out until the excess is gone. Spoke to my mechanic friend who insists that there was a recall on this a few years back. Anyone can shed some light on this for me?
I've never heard of a recall but a bad o-ring or too much lube can sling out. Usually if it's an overfill it goes away after a couple of hundred miles. With a bad o-ring (they get mashed sometimes) replacing that fixes it
But.. hundreds of dollars? Is he a Harley Mechanic? Sure he's a friend?
BTW, if there was a recall then I sure haven't seen it and it would be on the Kawasaki site. PLUS.. if there was a recall, the work should have been covered under the recall.

Dianna
Conway, AR
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)

Last edited by Dianna; 08-04-2008 at 05:01 PM.
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