Tuning rear end.

[roostafish]

Quick question... Rear end seems to ride a little high, kicks a little bit on g outs and big hits. Seems fine over chop, rocks, and smaller whoops.

A: Do I add a bit more sag?

B: Speed up rebound (possible packing)?

C: Soften compression?

???

 

[Jakobi]

You really need to watch it happen in 3rd person to know what the shock is doing. It could be either too stiff, rebounding too quickly, too soft and bottoming, or spring too stiff.

 

[roostafish]

The spring is correct according to static/race sag numbers. 25mm Static, 100mm Race.

Definitely not bottoming.

Left with Too stiff, rebounding too quickly, or, rebounding too slowly. I need a slomo camera setup to see it.

 

[Jakobi]

Well the easy option is to soften it up and see how it responds. If it was rebounding too slowly it would be more noticable after several hits in consession.

 

[Simmo737]

How's it go in braking bumps/rolling whoops?, if it feels normal and doesn't buck it s probably worth concentrating on high speed compression ( ie soften it), if it bucks in the afor mentioned its probably not enough total compression damping ( bottoming) if it isn't bottoming and it's still popping up over logs and reducing high speed compression has no effect and you have got a stiffer spring in there, it probably needs more rebound damping (especially high speed).

Correct sag/spring alone will not stop bottoming, it's in the valving.

Hope that helps

 

[GMP]

This is the new KTM Mike? I'd add rebound, if it rides high its certainly not packing. Go to the orange forums and see what they say. Fork could also affect it. Has Les done any of these yet? I'm sure he has and might know.

 

[roostafish]

The orange boards aren't as good as this board. I know and trust the people giving advice here. I have looked through the suspension discussion over there, just want to check here.

 

[twowheels]

The spring is correct according to static/race sag numbers. 25mm Static, 100mm Race.

Definitely not bottoming.

Left with Too stiff, rebounding too quickly, or, rebounding too slowly. I need a slomo camera setup to see it.

I'd take a look at the sag more closely, and run 105-110 in the rear. You'll be into the stiffer part of the rising rate quicker but you'll balance out the bike and take load off the forks.

 

[GMP]

Steve has a real good point. Maybe too much preload. I didn't want to say anything because I never rode or messed with a linkage KTM but in general too much preload makes the bike ride high and rebound too fast. Whats the actual shock spring preload?

 

[roostafish]

Static sag is 25mm. Just read a Dirt Rider article that said the bike likes 105mm race sag. The manual says 100mm.

 

[jpelaston]

Static sag is 25mm. Just read a Dirt Rider article that said the bike likes 105mm race sag. The manual says 100mm.

Is it the Manual that is calling for 25mm Static? I know my good friend who rides for Husaberg runs 38mm Static. He is around 180lbs. Can't recall off the top of my head what spring rate he uses.