KTM 150 sx 2017 suspension setup

mxallum77
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mxallum77
Hi guys

I have a KTM 150 sx 2017 I’m currently playing about with the suspension setup, I’m around 200lbs with gear on the suspension is standard I’m running 133psi in the forks and then with compression and rebound clickers they are set to standard this is also set to standard on the shock, just wondering what people setups and what seems best ?
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AJ565
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AJ565 9/19/2021 4:53pm
9/19/2021 4:53pm
That seems way too low of pressure. I’m 170 without gear so that should be around the same 200 with gear and I run in the 140’s psi wise. On my 250 when it had the AER I was running 156psi and would still bottom them from time to time around the track.

Best way to get a good setting is to get someone to slow mo video the bike at different parts of the track and see what it’s doing and go from there.
Bruce372
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Bruce372 9/19/2021 4:54pm
9/19/2021 4:54pm
Have you changed your back spring? That seems a little low for 200lbs.
mxallum77
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mxallum77 9/19/2021 11:41pm
9/19/2021 11:41pm
Bruce372 wrote:
Have you changed your back spring? That seems a little low for 200lbs.
No all completely stock
mxallum77
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mxallum77 9/19/2021 11:42pm
9/19/2021 11:42pm
AJ565 wrote:
That seems way too low of pressure. I’m 170 without gear so that should be around the same 200 with gear and I run in the...
That seems way too low of pressure. I’m 170 without gear so that should be around the same 200 with gear and I run in the 140’s psi wise. On my 250 when it had the AER I was running 156psi and would still bottom them from time to time around the track.

Best way to get a good setting is to get someone to slow mo video the bike at different parts of the track and see what it’s doing and go from there.
Yea I have read that but all the higher psi seem to be 250cc+ this is only a 150

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CarlinoJoeVideo
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CarlinoJoeVideo 9/20/2021 6:27am
9/20/2021 6:27am
Bruce372 wrote:
Have you changed your back spring? That seems a little low for 200lbs.
mxallum77 wrote:
No all completely stock
The correct shock spring is the first thing you need to get. That thing is way too soft stock for you.
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m21racing
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m21racing 9/20/2021 1:16pm
9/20/2021 1:16pm
Get right shock spring, update air and valving mid speed areas to later wp/factory components, and bike will be much improved.
AJ565
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AJ565 9/20/2021 4:52pm
9/20/2021 4:52pm
AJ565 wrote:
That seems way too low of pressure. I’m 170 without gear so that should be around the same 200 with gear and I run in the...
That seems way too low of pressure. I’m 170 without gear so that should be around the same 200 with gear and I run in the 140’s psi wise. On my 250 when it had the AER I was running 156psi and would still bottom them from time to time around the track.

Best way to get a good setting is to get someone to slow mo video the bike at different parts of the track and see what it’s doing and go from there.
mxallum77 wrote:
Yea I have read that but all the higher psi seem to be 250cc+ this is only a 150
After getting the right rear spring you’ll be able to really adjust the pressure to where you need. It’s really based on your speed/ability. 130’s on a 125 or a 150 I tend to blow through the stroke pretty easily. Mid to high 140’s seems to be a good spot for me as a 30+ A/B rider.
Ryan_Price 9/22/2021 6:12am
9/22/2021 6:12am
AJ565 wrote:
That seems way too low of pressure. I’m 170 without gear so that should be around the same 200 with gear and I run in the...
That seems way too low of pressure. I’m 170 without gear so that should be around the same 200 with gear and I run in the 140’s psi wise. On my 250 when it had the AER I was running 156psi and would still bottom them from time to time around the track.

Best way to get a good setting is to get someone to slow mo video the bike at different parts of the track and see what it’s doing and go from there.
mxallum77 wrote:
Yea I have read that but all the higher psi seem to be 250cc+ this is only a 150
AJ565 wrote:
After getting the right rear spring you’ll be able to really adjust the pressure to where you need. It’s really based on your speed/ability. 130’s on...
After getting the right rear spring you’ll be able to really adjust the pressure to where you need. It’s really based on your speed/ability. 130’s on a 125 or a 150 I tend to blow through the stroke pretty easily. Mid to high 140’s seems to be a good spot for me as a 30+ A/B rider.
Hi AJ, could you tell me what spring rate you're running? I'm around 180lbs B level rider (C level by the 3rd moto lol) and have been running the stock spring/air pressure on my 150 sx and I'm getting really bad arm pump (presumably because of the suspension setup). I've purchased a 42Nm spring and am thinking of running around 150PSI in the forks. Do you think I will be in the right ballpark? I'm pretty clueless when it comes to suspension.
AJ565
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AJ565 9/22/2021 12:14pm
9/22/2021 12:14pm
mxallum77 wrote:
Yea I have read that but all the higher psi seem to be 250cc+ this is only a 150
AJ565 wrote:
After getting the right rear spring you’ll be able to really adjust the pressure to where you need. It’s really based on your speed/ability. 130’s on...
After getting the right rear spring you’ll be able to really adjust the pressure to where you need. It’s really based on your speed/ability. 130’s on a 125 or a 150 I tend to blow through the stroke pretty easily. Mid to high 140’s seems to be a good spot for me as a 30+ A/B rider.
Ryan_Price wrote:
Hi AJ, could you tell me what spring rate you're running? I'm around 180lbs B level rider (C level by the 3rd moto lol) and have...
Hi AJ, could you tell me what spring rate you're running? I'm around 180lbs B level rider (C level by the 3rd moto lol) and have been running the stock spring/air pressure on my 150 sx and I'm getting really bad arm pump (presumably because of the suspension setup). I've purchased a 42Nm spring and am thinking of running around 150PSI in the forks. Do you think I will be in the right ballpark? I'm pretty clueless when it comes to suspension.
My weight and speed put me with a 4.4 spring on a 125/150. Race Tech’s web site has a good spring calculator that will help you.
1
Bruce372
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Bruce372 9/22/2021 12:50pm
9/22/2021 12:50pm
The OEM WP are really inexpensive and gave me more reliable results over RT.

To know if you have the correct spring, set the race sag to 105mm then measure spring length. 253mm is the sweet spot for the 260mm springs.

If you need 9 or 10+mm preload, then the spring is too soft.

On rate, round up!
1
Ryan_Price 9/27/2021 1:37am
9/27/2021 1:37am
Thanks both!

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