tooth skipping?

[IdZer0]

I was just out for a ride, and while I was accelerating hard it seemed as though something skipped a tooth. I can't say if it was the front or rear sprocket or even the gearbox. It only happened once. I checked the chain tension and at the loosest point it just barely touches the slider at the bottom of the swingarm. At the tightest point it's about 3mm away from the slider.

Chain and sprockets have 17k kms on them.  Chain and sprockets still look relatively OK but at least the chain is probably due for a replacement.  Could it be time for a new set of sprockets too already? Any idea if it's best to replace them before or after my next track day?

[Slide Panda]

Did you look to make sure you have every tooth for both sprockets also?  There's a chance you lost one...

[IdZer0]

Just checked, they're all there. I just noticed the teeth on the front sprocket are starting to 'point' to one side though.

Isn't this a bit early start skipping though?

[erkishhorde]

Maybe it's a slipping clutch instead?

[DarkStaR]

What makes you think you skipped a tooth?

[Langanobob]

It only happened once.

Serious question    Are you sure you didn't just accelerate over something like a paint stripe or squished frog that caused a momentary loss of traction that felt like a tooth skipping?

But regardless of the skipping or not skipping, if your front sprocket is getting pointed in one direction, it's time to replace your sprockets.

[IdZer0]

What makes you think you skipped a tooth?

It felt like a very brief interruption of acceleration. (and I mean _very_ brief)

Serious question    Are you sure you didn't just accelerate over something like a paint stripe or squished frog that caused a momentary loss of traction that felt like a tooth skipping?

But regardless of the skipping or not skipping, if your front sprocket is getting pointed in one direction, it's time to replace your sprockets.

Didn't think of that, Paint stripe is doubtful though; I think I was past the stripe when it happened and it was to brief a lapse for that. Now maybe it could have been small stick or rock but didn't see one.

Sprocket pointing in one direction is only noticeable when you look really hard. I was hoping I could still ride maybe 2000 km and a track day though.

[ScottRNelson]

Sprocket pointing in one direction is only noticeable when you look really hard. I was hoping I could still ride maybe 2000 km and a track day though.

The easiest way to tell if your sprocket teeth are bent is to roll the rear wheel forward then backward and if you can hear a difference in sound the sprocket teeth are bent.  You can listen first near the front sprocket, then near the rear one to find out which teeth have the most bend to them.

[IdZer0]

I didn't mean they're bent, they're a just a bit worn.

[greenmonster]

It felt like a very brief interruption of acceleration. (and I mean _very_ brief)

Something electrical/FI related.

Just my 2c.

[corndog67]

Replace the whole set, high quality chain, high quality sprockets, front and rear.   If you buy the cheap stuff, it won't last for sh_t and you'll have to do it again, fairly soon.  I prefer steel rears, like the stealth, mine is holding up really well.  If you go aluminum rear, expect to replace it in less than half the time a steel will last.   If you change the sprockets and not the chain, the old chain will wear out the sprockets prematurely.   Same with a new chain on old sprockets.