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Old 11-22-2020, 10:26 AM   #1
FastCletus552
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Join Date: Jan 2010
Location: Napa CA
Motorcycles: 03 KTM 450 SX - 97 Beta Techno 250 Trials - 09 Aprilia Scarabeo 200
Name: Jimmy C
KTM 450 SX pilot jet Jump

I got a new to me KTM 450 SX. It didn't run when I got it but I have since got it running. Problem I am having is its a bitch to get started, Especially when its hot. When its bone cold it starts real easy
I've adjusted the valves, and I did a thorough clean on the carb. I noticed the current jets are: Main is a 185, and pilot is 48. Stock settings are 155 main and 40 pilot.
I do trail riding and not motocross so for me I am most interested in easy starts and not super power. I am curious if I drop back down closer to stock would starting be easier? Maybe go from 48, down to 44ish?

Its a FCR 41 carb
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Old 11-22-2020, 10:47 AM   #2
byke
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Location: norcal
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Name: penorface
Big main jet. I'd probably put them both back to stock, maybe up one size for colder temps and/or exhaust.
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Old 11-22-2020, 03:25 PM   #3
FastCletus552
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Motorcycles: 03 KTM 450 SX - 97 Beta Techno 250 Trials - 09 Aprilia Scarabeo 200
Name: Jimmy C
Yep. That’s kind of where my head is at. I don’t think any mods have been done. Exhaust is a KTm so assume it’s stock.
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Old 11-22-2020, 03:54 PM   #4
Maddevill
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Join Date: Jun 2005
Location: Hayward
Motorcycles: ZX14,GS750E, KTM 450/540
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Mine is opposite. Easy to start hot, a bitch to start when cold. I'm thinking of sending the carb to Dave Hopkins. I've got a JD jet kit in mine.

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