Gears grinding - Page 3 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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\ Chattering Clutch? Transmission Trouble?
Rear End Woes? Splines Shot? Discuss it here!

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post #21 of 30 (permalink) Old 08-24-2016, 07:52 AM
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So it's only doing it when you downshift?

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post #22 of 30 (permalink) Old 08-24-2016, 08:15 AM
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Clutch isn't fully disengaging...

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post #23 of 30 (permalink) Old 08-24-2016, 08:16 AM Thread Starter
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I would say generally yes. However, when I tried to downshift to first and ground (which I assumed put me in neutral), then tried to shift back to second (maybe I was still in second? not sure.) I got a grind there too. All that without releasing the clutch lever. After stopping completely I was able to manage an ugly shift into first and ride off.

I don't think I've ever ground upshifting other than that.

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post #24 of 30 (permalink) Old 08-24-2016, 10:59 AM
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Well, I hardly ever down shift to 1st when the bikes moving. By then I'm braking with the clutch lever pulled in and I shift to first after I stop...or if no traffic, I'll go to neutral and shift down when I take off.

My only thoughts here are for you to eliminate the two possible causes....by installing a new clutch and a new clutch cable. If that doesn't cure it, you likely have a worn shifter fork, or a worn or damaged gear....which usually would only make noise going into one gear, not two, as the odds of having two bad gears is very low.

First remove the clutch cable and make sure it's lubed and sliding free with no roughness as Spockster suggested.
A Kevlar clutch kit with heavy duty springs will cost you about $100, a standard replacement without new springs about half that.

Obviously if the issue is due to something off in the gearbox, that'll be an engine pull.....
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post #25 of 30 (permalink) Old 08-24-2016, 11:26 AM
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1st gear being such a low ratio, it doesn't take much speed to make the gears gnash on a downshift. Upshifting out of 1st, I always just roll out to a low speed and grab 2nd right away. It's the same effect, wind up 1st too high and it will gnash every time.

Wouldn't take too much wrenching to pull the clutch cover, then inspect everything for the grooves mtb mentioned, or warped plates. Same with the cable.

When you need to pull harder on the clutch lever ... Is the lever already tight against the grip, or is there still a gap? That may lead you to which area to check first.

If I had the clutch out, I would also pull the long rod and make there's no varnish buildup there.
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post #26 of 30 (permalink) Old 08-24-2016, 02:32 PM Thread Starter
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Quote:
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1st gear being such a low ratio, it doesn't take much speed to make the gears gnash on a downshift. Upshifting out of 1st, I always just roll out to a low speed and grab 2nd right away. It's the same effect, wind up 1st too high and it will gnash every time.

When you need to pull harder on the clutch lever ... Is the lever already tight against the grip, or is there still a gap? That may lead you to which area to check first.
I'm 100% going to start avoid downshifting faster than the appropriate gear for my speed. Could you explain why the large ratio difference causes gnashing? My understanding of the clutch/transmission is that when the clutch is disengaged there shouldn't be any power transmitted. Is there enough loose oil in the clutch basket that it can cause drag between the plates if there's a big difference in the speed of the clutch plates?

When 'pulling tighter', the lever is already hitting the foam of my grip, I just squish it into the grip. Talking through this, it's probably the continuing deceleration of the bike is the actual reason the grinding is alleviated, not the extra millimeter on the lever.


@Knifemaker : I have very little luck shifting from second to neutral. Just skips down to first. I'll at least try to stay in second until I'm completely stopped.

I appreciate the under-the-cover advice. If fixing the operator error doesn't remedy the grinding, The wrenches are ready and waiting.

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post #27 of 30 (permalink) Old 08-24-2016, 05:45 PM
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My Vulcan only ground going into first before I moved the linkage on the case...

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post #28 of 30 (permalink) Old 08-24-2016, 05:47 PM
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...and NEVER going into 2nd,even with redline shifts...

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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

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"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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post #29 of 30 (permalink) Old 08-24-2016, 06:15 PM
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Quote:
Originally Posted by OleDirtyDoc View Post
...and NEVER going into 2nd,even with redline shifts...
Mine hates getting wound up in 1st, then going to 2nd. It doesn't exactly grind, but it doesn't sound happy at all. I also get nowhere fast doing that. 2nd-5th, can redline and no-clutch shift without any bad noises.

Thorn, it's hard to explain precisely .. There are varied sizes of gears, on various shafts, spinning at different speeds. When 1st gets spun up too fast, your above the right speed to be grabbing 2nd.

I'm going fairly slow when I shift to 1st, like a really slow corner or almost stopped. Not really engine braking, just getting ready to go again. The few times I engine braked with 1st, it was chirping the tire.

My '74 K20 acts the same way, 4spd with granny low, you always take off in 2nd. If you use 1st gear and high rpm, the shift to 2nd is going to be a grinder unless you wait for things to slow down.

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Last edited by Spockster; 08-24-2016 at 06:18 PM.
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post #30 of 30 (permalink) Old 08-24-2016, 08:27 PM
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Mine loves to be beat on

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Support your local FREEBIRDS MC
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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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