570 transmission 'slack' on throttle on/off

chris426f · Jul 1, 2012

Wonder if anyone has an view if this is a problem.....

My 2011 FE570 is a year old, I'm the second owner, 130 hours. I've observed that there seems to be some slack in the drive train. Between throttle on and throttle off, there is a noticeable 'clunk' (not enough that you assume there's a problem, bit its there) as the transmission flips from the engine driving the wheel to the wheel driving the engine.

I never really thought of it as an issues (as far as I remember its always been there), but a mate who rode it today commented on it. In the same group ride today was an 09/10 390, so we swapped bikes and I must say this sensation of transmission slack was absent on the 390.

From what I can see on the parts manual, the clutch does not have a cush drive in the clutch basket (if it did and it was worn, it would give the sensation I'm trying so hard to describe).

Any thoughts....

- Is this normal?
- If not any ideas of what could be the issue?

Thanks in advance

Chris

PS.... had a good lock through the mechanical sub-forum, could not see anything.

Whitestarz · Jul 2, 2012

Mine does it more when its geared 14 48 rather than 13 52 also I always get some wheel spin in most gears in sand dirt and gravel which gives that delay sensation

chris426f · Jul 3, 2012

Thanks Whitestarz,

This is more of a mechanical free play..... but it feels too much..... giving the clunk. As I say, the 09 390 did not exhibit the same sensation.

Just checked the 'slack' in the transmission by putting bike on stand and checking the free play at the gearbox sprocket (13 tooth) by rotating the rear wheel back/forward.....

- In 1st its 1.5 tooth pitches (well slightly under)
- In top its 2 tooth pitches

I'd be grateful if someone could check their 570 (with a 13 tooth sprocket) and report if there stack is the same (or less).

Thanks in advance,

Chris

pegscraper · Jul 5, 2012

Just measuered the 'slack' on mine, 2010 FE570 3966 miles 140hrs 13/52 gearing.
1st 1.5 teeth, top 2 teeth. Exactly the same so stop worrying.
What I've noticed is the chain slack is critical. If it gets only slightly out of spec the trans feels real sloppy with lots of backlash and clatter.

Chas · Jul 6, 2012

chris426f said:
From what I can see on the parts manual, the clutch does not have a cush drive in the clutch basket (if it did and it was worn, it would give the sensation I'm trying so hard to describe).

I'm fairly certain that the clutch basket does indeed have a cush drive. I know that the newer KTM's do.

chris426f · Nov 11, 2012

I forgot to post a reply after I sorted this...... the swing-arm bearings were destroyed, but I missed it!!!!

nick790 · Nov 11, 2012

pegscraper said:
Just measuered the 'slack' on mine, 2010 FE570 3966 miles 140hrs 13/52 gearing.
1st 1.5 teeth, top 2 teeth. Exactly the same so stop worrying.
What I've noticed is the chain slack is critical. If it gets only slightly out of spec the trans feels real sloppy with lots of backlash and clatter.

I agree, make sure you chain stays in spec' and things don't seem so bad.

570 transmission 'slack' on throttle on/off

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