BIG metal piece on oil drain bolt

Started by John1454, December 07, 2009, 09:07:51 AM

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dlearl476

Quote from: Speeddog on December 08, 2009, 01:54:44 PM
Yeah, that's the one.

The bike will usually shift normally for a while, but will it eventually jam.

Is this the same on a M900?  I think I need to check mine.  It's been "clicking" on upshifts for a while now, even with a pre-loaded shift lever.  A week or so ago, I had some real trouble shifting into second gear.  Blamed it on the funky shoes I was wearing as the next day it shifted fine, albeit with the "click," but it has me a little worried.  100 miles ago, I could pre-load the shifter and shift as smooth as an automatic transmission.  Puzzles me as the bike, despite being a '99, only has 6K miles.

Speeddog

Same setup on an M900, and AFAIK any belt-drive cam duc motor.

The spring does get flexed a bit when you shift, so failure is a bit dependent on mileage.
But I've seen 'em broken on low mileage bikes.
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Reseda, CA

(951) 640-8908


~~~ "We've rearranged the deck chairs, refilled the champagne glasses, and the band sounds great. This is fine." - Alberto Puig ~~~

dlearl476

Quick question: What would be the symptoms of a broken spring?   Besides, of course, a piece of it falling out of your crankcase.   ;D

Would the shifter "return" to it's normal at rest position without it?  Mine seems to do that just fine.

John1454

The only symptom I had was that it got stuck in neutral.


I'm glad I got all the pieces out before they caused real damage. I bought the spring yesterday from Ducati --- it was $3.49..... I have a feeling if it fully broke lose and got caught in a bad spot that it could / would do more than $3 worth of damage.

Speeddog

There are 2 springs on the shift mechanism on the left side of the motor.

The one at the middle pivot.
If that one breaks, the bike *can* shift normally.
But it will eventually jam.
If it jams on an upshift, the trans may be between gears, sometimes harmless, sometimes not so good.
If it jams on a downshift, the pivot and what's left of the spring clash with the gear on the crank, not good.

There's a 'centering' spring on the pivot at the bottom.
It's what brings the shift lever back to center after a shift.
If that one breaks, the lever will stay up or down, but the bike will still shift.

All of this is assuming that the loose spring pieces don't find their way into any gears.
It's not likely that will happen, but it will not be good if it does.

I've seen both springs broken, middle pivot springs a lot more than lower pivot springs.

Quote from: dlearl476 on December 10, 2009, 10:53:39 AM
Quick question: What would be the symptoms of a broken spring?   Besides, of course, a piece of it falling out of your crankcase.   ;D

Would the shifter "return" to it's normal at rest position without it?  Mine seems to do that just fine.
- - - - - Valley Desmo Service - - - - -
Reseda, CA

(951) 640-8908


~~~ "We've rearranged the deck chairs, refilled the champagne glasses, and the band sounds great. This is fine." - Alberto Puig ~~~

Doctor Woodrow

Quote from: ato memphis on December 08, 2009, 04:31:19 PM
Remember, when you put that cover back on, torque the bolts properly. You are dealing with aluminum, so Incredible-Hulking these on will just result in stripped threads.

On the 2005 620 the torque setting is only 10 Nm, no more!!!!! Yours should be the same. It might not seem like alot, but like atomemphis said, don't over torque it!!, They WILL snap off, or strip out, faster than you may think. This may also seem like an obvious thing, but don't just do it by hand, get a torque wrench, don't skimp, just do it right.

The Doc
2005 620 Dark "Zerafina", High mount Termi's, Cyclecat rearsets and clipons. Axio "Repsol" Hardpack backpack. Some of us put the 'Damn' in Crash Damnage.

DuciD03

#36
 [clap]

AMAZING!

My hats off to all of you for your good advice; generosity and courage of the guy who fixed it himself via duc M F advisors.  Yyyyooooooouuuuuuuu Guuuuuuyyyyyyyys!

.... When I first took a look at the piece of metal and thought WTF is that?  Oh right a piece of spring; well WTF would that come from? oh righ that shifetr spring I saw once when I was replacing a case cover ....lol

[bacon]

[bow_down]

[moto]
.... all the world is yours.

scott_araujo

A buddy of mine had his bike getting stuck in third gear.  Not sure if the spring was broken or just went soft but it was also a spring that caused the problem.  New spring and no problems since.

Scott

dlearl476

Quote from: Speeddog on December 10, 2009, 02:14:04 PM
There are 2 springs on the shift mechanism on the left side of the motor.



Thanks Speeddog.  I'm going to pull my cover for a look/see.  The bikes gonna be down for a couple of weeks with the suspension back at Ohlins.