22 ktm 150sx

hopsrev86
Hello
Just got a 22 ktm 150sx. Looking for some gearing and Power valve tips. I tried 14/50 it was ok. Stock PV setting. I have a 49 to try along with a 13 front. Wondering what other people have tried and how it works on the track. I have a lectron and V-force on the bike now. Stock exhaust still
thanks
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AJ565
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AJ565 5/30/2022 8:08pm
5/30/2022 8:08pm Edited Date/Time 5/30/2022 8:10pm
Lectron kills the hit of the bike.
PV depends on you. I like the stock spring around 1 3/4 turns in from all the way out.

Don’t go with a 13 front no matter what you do. It changes the chain angle and will put the rear suspension in somewhat of a bind and affects handling. Do some math and figure out the ratios and make a call from that. 13/50 = 3.846(most bottom end less top) 14/53 3.785 13/49 = 3.769 14/52 = 3.714 14/51 3.642 14/50 = 3.571 14/49 = 3.5(most top end giving up bottom).
DynoDan22
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DynoDan22 5/30/2022 8:16pm
5/30/2022 8:16pm
Isn’t stock gearing 13/48 on the 150sx?
hopsrev86 5/30/2022 9:24pm
5/30/2022 9:24pm
stock is 13/48
the stock carb with a jd jet kit still kinda sucks. I am gonna try this lecton and see what it does. I have a 49 so i will try that as well. What about the power valve? Should i just play with it until i find something that work?
wrc777
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wrc777 5/31/2022 5:25am
5/31/2022 5:25am
hopsrev86 wrote:
stock is 13/48 the stock carb with a jd jet kit still kinda sucks. I am gonna try this lecton and see what it does. I...
stock is 13/48
the stock carb with a jd jet kit still kinda sucks. I am gonna try this lecton and see what it does. I have a 49 so i will try that as well. What about the power valve? Should i just play with it until i find something that work?
For the powervalve the only way to know is to play with it. The stock carb with JD jet block gasket and leaner Mikuni needles worked well for me. The Lectron made it a lot smoother (slower I think).

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tsmitty2661
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tsmitty2661 5/31/2022 5:46am
5/31/2022 5:46am
I run 1 up in rear from stock gearing on my 150sx. I bought stock gearing but i am hesitant to go back, maybe on more wide open tracks ill use it, was just looking for a little more top end. Even with Lynks doing my top end, i feel like i would be banging the clutch extremely hard to keep the bike in the top end in corners. As others said, play with the power valve. If you have it too far in youll loose some overrev and vise versa. A quick test for you to do is do a a couple laps with it all the way in and then all the way out, they are totally different bikes. From there i just do half turns or so based on the tightness of the track and where i want the power at. I find like half turn in from flush with the case is the sweet spot for me. AJ's jetting is pretty spot on with the mikuni, just some minor tweaks for me to get it running perfectly. I had no luck with the jd kit in my mikuni
Tracktor
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Tracktor 5/31/2022 10:53am
5/31/2022 10:53am
Keihin 38mm Airstriker with STIC metering block makes the KTM/Husky 125 absolutely rip. I've posted my experiences before if you search. We did a ton of testing on these engines.......granted on an 18 TC125 but pretty much same engine...........
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AJ565
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AJ565 5/31/2022 10:56am
5/31/2022 10:56am
hopsrev86 wrote:
stock is 13/48 the stock carb with a jd jet kit still kinda sucks. I am gonna try this lecton and see what it does. I...
stock is 13/48
the stock carb with a jd jet kit still kinda sucks. I am gonna try this lecton and see what it does. I have a 49 so i will try that as well. What about the power valve? Should i just play with it until i find something that work?
You should just rejet the stock carb and use the extra money for other things.
AJ565
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AJ565 5/31/2022 10:59am
5/31/2022 10:59am
DynoDan22 wrote:
Isn’t stock gearing 13/48 on the 150sx?
Yes it is. That’s a 3.69 ratio. A 14/51 is as close you can get to that, but changing the chain angle allows the rear suspension to work better and absorb bumps under load without fighting the engine.
hopsrev86 5/31/2022 3:23pm
5/31/2022 3:23pm
thanks for all the info. I will play with the PV. I was just looking for some tips on where to start. I will probably leave the gearing at 14/50. I will check the jetting on the stock carb. I already have the lectron so why not try it. I can go back if I dont like it. I got the hole G2 throttle setup. I dont have any experience with this but it feels good on the bike. Any other tips for setup? Anyone try the works connection axle block kit?
hopsrev86 5/31/2022 8:57pm
5/31/2022 8:57pm
AJ565 wrote:
Lectron kills the hit of the bike. PV depends on you. I like the stock spring around 1 3/4 turns in from all the way out...
Lectron kills the hit of the bike.
PV depends on you. I like the stock spring around 1 3/4 turns in from all the way out.

Don’t go with a 13 front no matter what you do. It changes the chain angle and will put the rear suspension in somewhat of a bind and affects handling. Do some math and figure out the ratios and make a call from that. 13/50 = 3.846(most bottom end less top) 14/53 3.785 13/49 = 3.769 14/52 = 3.714 14/51 3.642 14/50 = 3.571 14/49 = 3.5(most top end giving up bottom).
thanks for the help. I ordered some parts for the stock carb to try
Tbmx413
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Tbmx413 6/2/2024 4:42pm
6/2/2024 4:42pm

I have tried stock gearing, 13/49, 13/50, and tried 13/47 today and that has by far been the best gearing I have experimented with. Still plenty of power to pull 2nd through the corners and you don't have to shift quite as quick on the exits. Going up in teeth in the rear sprocket just causes 2nd/3rd gear to run out way quick in my opinion. 

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