[Billsy]

When I got the bike the chain tension seemed a little tight so I slackened it off and went on to ride 1k miles before the first service. Dealer then adjusted chain at service and even said to me that it was way to slack when I brought it in. I didn’t think anything of it and continued to ride. Just checked tension before going away in a road trip next week and the chain was much tighter than the book calls for as set on the service 1k miles ago.

Have set the slack back to 2mm to swing arm 25mm back from slider as per book on a paddock stand.
Chain is the slackest I’ve ever had on a road bike but it is as per the manual.
Do KTM/Husqvarna want the chain slack to allow compression when doing off road work?

 

[DarkWhiteChocolate]

When I first checked mine I noticed that the manual does not do a good job with explaining where to properly check it from. I would guess this is a tech at the dealer who is misinformed. My dealer was spot on and I've been keeping it there ever since. I'm temped to 3d print a gauge that indexes in the proper spot on the swingarm, something that will show if you are in the correct range.

I do hear it slapping when I catch air, but better that than being too tight!

 

[chump00]

So the question I have is if I'm riding purely on road can/should I tighten it a bit more than the manual says since I won't be using all the swingarm?

Sent from my moto g power (2021) using Tapatalk

 

[Billsy]

I’m sticking to the settings in the manual for my road trip next week even though the chain looks very slack.
It’s not the typical figure of around 20/40mm movement at the mid point like every other bike I’ve owned.

 

[DarkWhiteChocolate]

I go over more urban jumps than I do when off road, speed bumps, curbs, loading ramps. I'd keep it in spec with the manual. The stock chain is shit anyway, mine started to squeak at 1000 miles and that's with me spraying it with lube often...

 

[norden_diepholz]

The Duke 790 also had the squeaky chain. The cz chain is quite wide. Take off the plastic chain guard and see if the chain is rubbing sideways there. With increased mileage, the chain becomes quiet because it has worn in. You may be able to speed this up by removing material with the dremel.

 

[AlexSpain]

Yesterday master of service told me that the distance should in size of forefinger not less....Very strange but will see

 

[norden_diepholz]

A well or correctly tensioned chain has less chain slap at low speeds. That was also a problem with the 790 engines. The 890 engines generally have fewer problems with this due to the increased flywheel mass.

 

[5a5ch4]

When I put the bike on the main stand, I noticed that the chain flickers a lot when engaging 1st gear without throttle increase about 1000U/m and gives a lautet crackle of itself, from 2000U/m it becomes quieter but always present, as it can be seen and heard in the video.

Microsoft OneDrive Cloud - Videos
20230226_143947 - Chain flickers
20230226_144224 - Chain from behind
20230226_144308 - Chain from above
20230226_144411 - Chain from below

Maybe someone has a simple fix that I can do on the spot. Otherwise I would have to go to the workshop again.

 

[norden_diepholz]

I think the situation you describe is illegal according to the manual.
The chain tension is too low when the suspension is extended. Since a two-cylinder engine does not continuously deliver a 100% constant torque, this fluctuating torque comes into imbalance with the mass inertia of the rear wheel.

 

[5a5ch4]

I think the situation you describe is illegal according to the manual.
The chain tension is too low when the suspension is extended. Since a two-cylinder engine does not continuously deliver a 100% constant torque, this fluctuating torque comes into imbalance with the mass inertia of the rear wheel.

I spoke with the workshop earlier and said: that the transducer or and the chain at the main stand no tension prevails. If you sit on the motorcycle, then the oscillator hangs under tension so that the chain is automatically tensioned and then runs more quietly. I'll go out tomorrow times and observe that times, whether there is something changes. Otherwise, he would re-tension the.

 

[Thierrix]

It took me 3-4 readings and a good amount of time searching the net to figure out exactly what the manual says. I read the english and french versions and none is very clear.
If you think that you understand the manual and see that your chain is slack, chances are you did it correctly !
One experimented tech told me it was too slack (remember, I'm pretty sure I figured ou the instructions correctly. This guy is more used to road bikes) and another experimented tech (specialized in motocross) told me my chain tension was fine, and the 901 (or 890) are the kind of bikes where the geometry of the rear springarm and position of front sprocket require a lot of slack to account for suspension travel and chain length needed.

 

[DarkWhiteChocolate]

If they sold a Damm tool that indexes on the swing arm and had a gauge with a factory recommended range on it I'm sure we would all spent $20 to $30 on it!!

 

[Thierrix]

Haha ! Good news for you then : Try this
No idea if it’s worth any good.