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Cooper 688 Liked a reply to forum topic Stic “Super X” Carb
7/16/2026 1:24pm
We were recommended 113A for 125/150 and 114A for 250. Definitely seems to work.
This forum topic has 11 replies.
ivanb1 Added a reply to Stic “Super X” Carb
7 hours ago Mikuni is easy to dial in. In the KTMs its replace the jet block gasket with the JD gasket , slide and thats it . The rest is playing with jets and float height like any other carb. I have a KTM with TMX38 that has that problem and now is running excellent , spending 100$ in carb parts. A...
ivanb1 Added a reply to Stic “Super X” Carb
1 day ago For the 150sx 114a tube or the 113?
ivanb1 Added a reply to 125/150/250/300 KTM/HUS/GG jetting thread
6/30/2026 12:35pm Bel ray gear saver 80w but recently its out of stock , so i switch to motul trans oil expert 10w40. Whats your power valve setting? . im on oem spring 1 turns in but i didnt notice any change, i was 1.75 turns. Soon i will try the red spring , would like to feel the power band hit...
ivanb1 Added a reply to 125/150/250/300 KTM/HUS/GG jetting thread
6/21/2026 7:25pm In summer sea level i use 32.5 pilot with the #5 slide , no notch. Below 75-70 temp i change to 35 and my bike when temps reach to 40F my air screw is at 1 turn and maybe i can drop 37.5 but that temp is early in the morning. Usually i set the Air screw at 1.5 turns
ivanb1 Added a reply to 125/150/250/300 KTM/HUS/GG jetting thread
6/16/2026 4:18pm Last year i was on 190lbs and i put on my 150sx a 4.4kg rear spring Race tech with great results and 140psi in front fork , now im 171lbs and i had a hard time getting the right sag without gear, the best i could get is 103mm sag , i think with full gear i reach the 105...
nextgenMX Liked a reply to forum topic 125/150/250/300 KTM/HUS/GG jetting thread
6/12/2026 9:00am
Thats good to hear, since the bike runs so well right now i didn't want the changes to mess it up haha. I've heard lots of good about the pro circuit system on the 150's so ill try it out and see how it goes. The r304 itself was a big improvement.
This forum topic has 1224 replies.
ivanb1 Added a reply to 125/150/250/300 KTM/HUS/GG jetting thread
6/12/2026 9:00am Nice bike!.. i have the same 2020 with almost same jetting . sea level 50-65F range temp 520, 35 , 42-74 pos 2, AS 1.75 . PV 1.25 and in few days im gonna try the red spring and Boyesen Super stock reeds .
ivanb1 Added a reply to R304 or 304 2020 KTM 150SX
6/9/2026 12:53pm This is a 2020 150sx with the 304 factory sound (long) silencer and stock exhaust . In my opinion is the best sound silencer , its not like the shorty , loud and like an old 2 stroke . The 304 Has a deeper tone more like a high cc 2 stroke and really nice over rev .
ivanb1 Added a reply to R304 or 304 2020 KTM 150SX
6/9/2026 12:51pm
ivanb1 Added a reply to 125/150/250/300 KTM/HUS/GG jetting thread
3/17/2026 2:09pm I have 2020 150sx also, when temps are close to 40 F (sea level) in the morning i have to set the airscrew like 3/4 turn out to make it start and when temps are a little higher in the midday, 1 , 1.25 turn out is sweet spot . So i’d try 37.5 PJ at those temps and avoid...
ivanb1 Added a reply to 125/150/250/300 KTM/HUS/GG jetting thread
11/6/2025 1:55pm I've been using the setup (page 1) for the small bore with great results at sea level, from 45°F- 85°F with only air screw adjustment . Now at 85°F im starting to feel a little sputtering in the transition to the needle (1/4 throttle) again , but im gentle with the throttle, maybe with a more agressive ttype of riding...
ivanb1 Started a new thread 150sx 2020 top end inspection 45hs and suspension setup
9/17/2025 2:38pm Hi everyone , since my bike is reaching the 50hs , i already buy a top end kit vertex 57.95 (B Size) dual ring , i know i should measure the cyl first but that was a rookie mistake , already have everything to measure the bore , so in case the pistón i have is too tight, i will...
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FGR01 Liked a reply to forum topic 125/150/250/300 KTM/HUS/GG jetting thread
8/28/2025 1:49pm
Good improvement. It sounds like there’s still a bit of initial hesitation. Try a 32.5 pilot sometime. Especially as it keeps getting warmer temperature.
This forum topic has 1224 replies.
ivanb1 Added a reply to 125/150/250/300 KTM/HUS/GG jetting thread
8/28/2025 1:00pm Update: now with 42-74 2 clip , is much better , im pretty happy how the bike is runnig, you can hear it from the video. Today i had a MX class, so i could test it. I notice after i let the engine idle for a few minutes, starts to sputters/ hesitate but after a few full throttle passes...
FGR01 Liked a reply to forum topic 125/150/250/300 KTM/HUS/GG jetting thread
8/25/2025 6:30pm
Yeah you should have none of that hesitation. Put in the 42-74 on clip 2. And I also think you should be getting more towards a 520 or 540 main in those temps. On my 150 I am running a 540 even in crazy hot Arizona and elevation 400M. As a tuning option, yes you can try the -75 needles. I used them in some of the 2022 125's that were prone to a roll on rich hesitation. Don't be afraid to try them.
This forum topic has 1224 replies.
ivanb1 Added a reply to 125/150/250/300 KTM/HUS/GG jetting thread
8/25/2025 1:54pm sea level , 53°F 5 Slide without notch 500 MAIN , 35 PJ, AS 1.5 , needle 43-74 2 clip , PV 2 turns, , float height: 7-8mm , 40:1 motul 710 Im having a hesitation when im reaching 1/4 throttle, its more noticeable when im gentle with the throttle in 1st and 2nd gear. If im more agressive with...
ivanb1 Added a reply to 125/150/250/300 KTM/HUS/GG jetting thread
8/11/2025 5:26pm BR9EIX and the last one that fouled is BR8EIX and is new . Thought the hotter plug maybe will help . I think i will try the 710 oil because i like how the bike is running , dont think is the jetting
ivanb1 Added a reply to 125/150/250/300 KTM/HUS/GG jetting thread
8/11/2025 6:06am Hello brother Ive been using the jetting setup for the 150sx succesfully. 53°F sea level 5 slide, 37.5 PJ, 500 main , 42-74 3 clip , 40:1 motul 800, 93 oct pump gas . The problem is im a beginner and im not riding WOT, only in the straight part of the track . i go down to 35 PJ...
ivanb1 Added a reply to Ktm 150 sx transmission oil
6/12/2025 11:16am Thanks everyone for the replys. Yesterday i order 2 bottles of Bel Ray gear saver 80w85. Looks like this is the first choice for a Lot of people ! So can't be go wrong, if someday My local dealer doesnt have it anymore, without doubt i'd go with the Motul transoil