Shifts between 1st and neutral, rolls freely in both.. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Rear End Woes? Splines Shot? Discuss it here!

 
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post #1 of 10 (permalink) Old 09-10-2015, 08:17 PM Thread Starter
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Shifts between 1st and neutral, rolls freely in both..

Hello All,

I know this isn't the proper way, or section, to do an introduction, but I need some help with a vn750 that I recently acquired from my brother and figured I would jump right in. I've been lurking and searching the transmission section of the forum meticulously for a few weeks now.

Little backstory: My brother picked the bike up from a dealer about a year and a half ago, rode it for about 6 months or so before it broke down, then it sat in a garage for about a year. He is now stationed in NC (Marines) and didn't want to deal with the bike, so I took it off his hands. Plan is to get it going again and do a hard tail, bobber build.

Symptoms: When it broke down, the bike was still running fine but would no longer move while "in gear", just revved.

I now have it here in my own garage and have begun tearing into it a bit. The bike will still shift into first and back to neutral (neutral light turns on and off accordingly), but will still roll freely while in "first" gear. Occasionally, while doing this, the bike will not go back into neutral from first (no light) or back into first from neutral. Rolling the bike a little bit usually remedies this and I am able to get it back to neutral with the light on.

I already pulled the oil glass site cover and checked the pawl and spring. It seems to be OK, moving back and forth as normal. I can also see it shifting from first to neutral. I took the clutch cover off and removed the springs, but have not yet pulled the plates out. From what I can see so far, they look OK. My main concern is the fact that the bike is still able to be rolled forward and back while it is in "first" gear. Something, somewhere is not grabbing or engaging like it should. I did notice that neither the basket or inner plates are rotating when the bike is rolled in first gear.


I'm hoping that someone here may know a quirk with these bikes that may be causing this and will make my day by telling me that I don't need to split the case. It's not that I won't, I just REALLY don't want to. Would much rather spend my time building the bike and writing/updating a build thread than rebuilding the engine.

Any help is more than appreciated.

2008 Yamaha R6 - Plenty of goodies and go fast parts.

New Project:
2003 Vulcan 750
- Final drive spline problems
The bane of my existence...

Last edited by ProjectVulcan; 09-10-2015 at 08:32 PM.
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post #2 of 10 (permalink) Old 09-10-2015, 08:31 PM
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Rear splines on driveshaft are worn out from not being lubed

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post #3 of 10 (permalink) Old 09-10-2015, 08:35 PM Thread Starter
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Quote:
Originally Posted by OleDirtyDoc View Post
Rear splines on driveshaft are worn out from not being lubed
I was just reading about this. I wish I had been the one riding when it broke down, so I'm not taking so many shots in the dark. I'll take a look at driveshaft. Thanks!

2008 Yamaha R6 - Plenty of goodies and go fast parts.

New Project:
2003 Vulcan 750
- Final drive spline problems
The bane of my existence...
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post #4 of 10 (permalink) Old 09-10-2015, 09:10 PM
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Quote:
Originally Posted by OleDirtyDoc View Post
Rear splines on driveshaft are worn out from not being lubed
Yep yep yep. 99% of the time.
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post #5 of 10 (permalink) Old 09-11-2015, 11:02 AM
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CAn't be a broken shifter rod? Seems like you might think it was in gear. Seems like even wiuth worn splines it would slip a lot before finally dying.

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post #6 of 10 (permalink) Old 09-11-2015, 11:07 AM
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Sounds like the final drive splines for sure.

If that's the case I have a spare final drive floating around. PM me.

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 #7 of 10 (permalink) Old 09-15-2015, 04:02 PM Thread Starter
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Update:

Finally had some time to tear the bike apart some more. Before doing so, I decided to start her up and see exactly what was going on when it's running. With the back wheel off the ground and the trans in first gear, the wheel actually started spinning. Brought a tear to my eye.

I was able to shift to second as normal, so, luckily for me, transmission seems fine. I had a suspicion that once I put the bike back down on the ground, with its weight on it, that the driveshaft would begin slipping. I was correct. Fine in neutral, but as soon as I clicked to first it began whirring and making a grinding noise.

Put it back on the center stand and tore the back end apart and found some nice, fine red powder.



So, our suspicions have been confirmed. I haven't completely pulled everything apart yet, but plan on doing so tonight. I called it quits last night, after getting the wheel and everything off, when the final drive didn't immediately separate from the drive shaft. Granted I didn't put too much effort into it, but any advice on separating the two?

Will update later, thanks for the help guys!

2008 Yamaha R6 - Plenty of goodies and go fast parts.

New Project:
2003 Vulcan 750
- Final drive spline problems
The bane of my existence...
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post #8 of 10 (permalink) Old 09-17-2015, 09:20 PM Thread Starter
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Yep.

Had some time to tear the bike apart. Our suspicions have been confirmed. Looks like I will be needing a final drive and drive shaft. I've never been so happy to see stripped splines. I'm just glad I don't have to split the case open.
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2008 Yamaha R6 - Plenty of goodies and go fast parts.

New Project:
2003 Vulcan 750
- Final drive spline problems
The bane of my existence...
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post #9 of 10 (permalink) Old 09-17-2015, 09:24 PM
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Yup that's the tell tale red rusty color of death there my fine feathered friend

ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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post #10 of 10 (permalink) Old 09-17-2015, 09:32 PM
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I bet once you get that fixed you'll check it on a regular basis. That's probably the #1 thing we suggest to new members is to check your splines. Lots of us have used the Moly 60 lube that's available at most Honda shops.

"Show me a man who makes no mistakes, and I'll show you a man who doesn't do things." Theodore Roosevelt."

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