Clutch Slipping? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 08-22-2018, 10:07 AM Thread Starter
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Clutch Slipping?

Hey ya'll,

I've got my '95 that I've been bumming around town on the last couple weeks and never really had a chance to open it up in 5th gear on the highway until recently. I was looking for some guidance/opinions from you guys.

It seems to be revving a little higher than I seem to remember so I adjusted the clutch lever as many of you have mentioned in other threads but I'm still concerned about possible slip in 5th gear. I'll explain the scenario below:

I'm in 4th going 45 mph to 50 mph and then shift up to 5th gear. The revs drop to about 3000 RPM and then quickly climb back to 4500 (and 5000) RPM before I get above 70 mph.

I guess I want to know what your highway experiences are with your bike (RPM's to MPH, etc.). I'm wondering if it might be time to change out the springs and clutch pack. FYI the bike has 17,500 miles on it.

Thanks,

Brandon Ollhoff
1995 VN750
Milwaukee, WI

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post #2 of 8 (permalink) Old 08-22-2018, 10:44 AM
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What happens if you shift to 5th and give it full throttle? Do the rpms just run away without gaining speed in proportion to rpm? That's slipping.

Just in case ... What oil and weight are you using?

I found on my bike, it's a fine line between clutch not dragging and clutch not slipping, as far as cable adjustment. I had to go past the dragging stage to slipping, then adjust very slightly until there was no slippage and no dragging. It had just one spot where it had to be.

The bike had the wrong oil when I first got it, so those adjustments were just after switching to Rotella 15w40. Clutch adjustment is one thing I haven't experimented with, once it worked, I left it alone.

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post #3 of 8 (permalink) Old 08-22-2018, 12:24 PM
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I can always tell I'm in 5th gear if my tach is [email protected], [email protected] Can't remember what 80 mph is, been a while since I rode those speeds. 5th is not very tall, your rpms at 70 sound fairly normal to me

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post #4 of 8 (permalink) Old 08-22-2018, 04:19 PM Thread Starter
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Quote:
Originally Posted by Spockster View Post
What happens if you shift to 5th and give it full throttle? Do the rpms just run away without gaining speed in proportion to rpm? That's slipping.

Just in case ... What oil and weight are you using?

I found on my bike, it's a fine line between clutch not dragging and clutch not slipping, as far as cable adjustment. I had to go past the dragging stage to slipping, then adjust very slightly until there was no slippage and no dragging. It had just one spot where it had to be.

The bike had the wrong oil when I first got it, so those adjustments were just after switching to Rotella 15w40. Clutch adjustment is one thing I haven't experimented with, once it worked, I left it alone.
RPM's climb quicker than when I initially got the bike but almost proportionally to the mph.

I don't know what the PO used but I was going to change it out with Castrol GTX High Mileage 10w40 since that's what the manual calls out.

Brandon Ollhoff
1995 VN750
Milwaukee, WI

Planned modifications:
USB Outlet + Voltmeter
LED headlamp
LED turn signals
Windshield
Ear Shave (possible)
BOllhoff is offline  
post #5 of 8 (permalink) Old 08-22-2018, 04:20 PM Thread Starter
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That's good to know that I'm in the relative ballpark.

Thanks!

Brandon Ollhoff
1995 VN750
Milwaukee, WI

Planned modifications:
USB Outlet + Voltmeter
LED headlamp
LED turn signals
Windshield
Ear Shave (possible)
BOllhoff is offline  
post #6 of 8 (permalink) Old 08-22-2018, 04:39 PM
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Don't use automotive oils, use something with the JASO-MA spec. This includes pretty much all 10w-40 motorcycle oils (a little pricey, but can be worth it) or Shell Rotella 15w-40. (Rotella T4 & T6 are very popular here and on many other motorcycle forums. I used to run it, now I have Castrol Actevo 10w-40 in mine.)

Again, do NOT use automotive oils. This can contribute to clutch slippage.

BTW, this bike is OK to rev high. You don't have to shift at 3k rpm like a car, this engine seems to make best power and act happiest at 4k-6k RPM in my opinion. 70-80 mph you ought to be turning about 5k rpm or higher, it's just the way these were built.

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post #7 of 8 (permalink) Old 08-22-2018, 06:18 PM
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High Mileage sounds like something with friction modifiers. Make sure it doesn't have 'energy conserving' on the rating seal.


2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #8 of 8 (permalink) Old 08-23-2018, 09:24 AM Thread Starter
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Quote:
Originally Posted by ubertalldude View Post
Don't use automotive oils, use something with the JASO-MA spec. This includes pretty much all 10w-40 motorcycle oils (a little pricey, but can be worth it) or Shell Rotella 15w-40. (Rotella T4 & T6 are very popular here and on many other motorcycle forums. I used to run it, now I have Castrol Actevo 10w-40 in mine.)

Again, do NOT use automotive oils. This can contribute to clutch slippage.

BTW, this bike is OK to rev high. You don't have to shift at 3k rpm like a car, this engine seems to make best power and act happiest at 4k-6k RPM in my opinion. 70-80 mph you ought to be turning about 5k rpm or higher, it's just the way these were built.
Thanks for the pointers! You're not the first person that has mentioned using Rotella (outside this forum) so I'll go with that instead!

Quote:
Originally Posted by Spockster View Post
High Mileage sounds like something with friction modifiers. Make sure it doesn't have 'energy conserving' on the rating seal.

Nice graphic! Thanks for the help!

Brandon Ollhoff
1995 VN750
Milwaukee, WI

Planned modifications:
USB Outlet + Voltmeter
LED headlamp
LED turn signals
Windshield
Ear Shave (possible)
BOllhoff is offline  
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