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That jetting sounds pretty lean...I”m at 37.5 pilot, 5.75 slide, 450-460 main...1.5 a/s...Inspect your reeds...Mine are stock, but it was an issue for some ...

https://m.vitalmx.com/forums/Tech-Help-Race-Shop,42/KTM-HUS-125-150-250…

I Rode my 18 250sx yesterday...45hrs on the engine, never been apart...these bikes absolutely rip...I should put a top end it her.....

I have 52 on the stock reeds and stock top end. Still reading 200psi on the compression gauge.

Fww I had 53 hours and had the top end done and dealer said it was time, I needed it ( end gap was past spec ) 52 yr old shitty rider

Update! I finally tried the 5.5 slide yesterday! It was spot on. The 32.5 pilot circuit was a bit lean though but I didn't bother changing it because I was too busy riding my YZ125. That being said, this spec should be about perfect for 70* weather near sea level. The clip may be able to lean out to 3rd with a 35PJ but the main should not be effected. I'm running 91 octane pump gas mixed at 60:1 with Bel Ray H1-R. MJ 470 PJ 35 Slide 5.5 Needle 42-75 Clip 4th (or 3rd weather depending) Needle jet s-4...