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Author Topic: Help : 36mm Mikuni on 82 250XC  (Read 1999 times)

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Offline ozktm

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Help : 36mm Mikuni on 82 250XC
« on: June 09, 2015, 11:18:30 AM »
Guys,

Helping Daz Milton out.
Any one with some baseline jetting to start out with for a 36mm mikuni on an 82 250XC?

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Regards,
Adrian Goold #101

'72 KTM 175 |'74.5 KTM 250 |'74.5 KTM 400 |Hagon/KTM 250 proj|'76 MC5 250 Project |'76 MC5 400|'78 KTM 250 Project |'81 KTM 250 MC | '81 KTM 495 MC

Offline HVA61

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Re: Help : 36mm Mikuni on 82 250XC
« Reply #1 on: June 09, 2015, 12:50:00 PM »
Twisting the throttle and getting off the pilot may help  :P
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Offline bigk

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Re: Help : 36mm Mikuni on 82 250XC
« Reply #2 on: June 09, 2015, 02:07:42 PM »
Why does it have a 36mm carb? 38mm is standard & the following jetting specs are straight from the 1982 Husqvarna racing handbook for 250XC:
Type: Mikuni
Venturi: 38
Main jet: 410
Needle jet: R-4
Idling jet: 45
Needle position: #4
Air jet: 2.0
Throttle (slide): 2.0
Needle: 6DH20
Air screw: 1.5 out from bottom
This jetting is also listed in this book for 1982 CR250 but WR 250 jetting is different.
Cheers,
K
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Offline ozktm

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Re: Help : 36mm Mikuni on 82 250XC
« Reply #3 on: June 09, 2015, 04:12:22 PM »
Good point Shoey!
Yes it has a 38mm Bigk. Daz wants it to roll on better in the low to mid. We are going to try a 36mm to see what change we get.
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Regards,
Adrian Goold #101

'72 KTM 175 |'74.5 KTM 250 |'74.5 KTM 400 |Hagon/KTM 250 proj|'76 MC5 250 Project |'76 MC5 400|'78 KTM 250 Project |'81 KTM 250 MC | '81 KTM 495 MC

Offline bigk

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Re: Help : 36mm Mikuni on 82 250XC
« Reply #4 on: June 09, 2015, 04:23:06 PM »
Well that's a whole different kettle of fish, can't help with that one but I'd start with a 400 main, 40 pilot, probably 2.5 slide & whatever needle & needle jet you have & go from there. I think it will be trial & error for you on that one.
K
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