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Old 10-28-2012, 02:24 PM   #1
JR_FX OP
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Joined: Dec 2007
Location: Funchal, Portugal
Oddometer: 173
990 sm shifting problems

I have a friend with a 990 SM that is complaining about the 2 gear "jumping"occasionally when he opens up the throttle or feathers the clutch to pop up whellies. Apparently, when he´s cruising everything is normal.

What do you guys think? I´m leaning towards the gear shifting mechanism - coul be the drum with a broken wall between the tracks, or the rollers...

Either way we are looking at spliting the cases, right?
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Old 10-28-2012, 05:46 PM   #2
geometrician
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Joined: May 2008
Location: West-By-God Virginia
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Pissed damnit

no you don't have to split the cases to deal with the shift mechanism

when I am bouncing up REALLY hard-rock trails & stair steps I've had my 950AdvS jump out of gear when in 1st or 2nd into neutral- I've been riding for a long time & I know it's not my boot doing it

I think (and have thought of starting a thread on it) that the shift-detent spring that keeps the detent roller pressing into the shift-drum gear-detent-cam is weak.

Many bikes have had their shift detent springs strengthened by aftermarket companies like Factory-Wheelsmith Racing to keep the bike in (whatever) gear under accel/deceleration

I've wondered if anyone (including the KTM Factory) ever produced stronger springs for this... it's annoying to be working a steep trail only to have the bike pop into neutral...
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Old 10-29-2012, 09:59 AM   #3
crashmaster
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Quote:
Originally Posted by geometrician View Post
it's annoying to be working a steep trail only to have the bike pop into neutral...
BTDT.
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Old 02-14-2013, 03:07 PM   #4
JR_FX OP
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Location: Funchal, Portugal
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A litle update - we opened the clucth cover and the gear shifting mechanism was all good. while at it we cleaned the clutch oil jet - it was cloged.
The gear change got better, smoother, but the 2nd gear still pops out ocasionally.
I´m thinking that the problem migth be a damaged shifting roller.
Will split the cases in a nearby future.
My questions now are:
- what special tools do I really need do open up (and close ) the engine?
- besides the shifting roller(s) and the gasket set, what parts do I need (or should) order - we´re trying to minimize the inop time for the bike as it is his daily commuter?
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