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Author Topic: JETTING INFO FOR 38MM CARBY TT500 XL350 1973/74 CR250 CZ400  (Read 1517 times)

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Offline jimg1au

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JETTING INFO FOR 38MM CARBY TT500 XL350 1973/74 CR250 CZ400
« on: September 30, 2011, 02:23:17 pm »
hi
would like jetting specs for petrol using 38mm mikuni
 tt500 yamaha
xl350  honda
1973/74 cr250 honda
cz400
i have a formula to convert petrol jets to methenol
this was given to me by a engine tuner that converts gsx1100rs to methenol for speedway use
thanks
jim
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Offline curly001

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Re: JETTING INFO FOR 38MM CARBY TT500 XL350 1973/74 CR250 CZ400
« Reply #1 on: September 30, 2011, 04:30:23 pm »
James,

Running a 36 mm Mikuni on my XT runs same spec as my old 38mm.

Main 230

Pilot 35

P2 needle jet

6FJ4/7 needle

Curly
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Offline jimg1au

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Re: JETTING INFO FOR 38MM CARBY TT500 XL350 1973/74 CR250 CZ400
« Reply #2 on: September 30, 2011, 04:45:32 pm »
thanks curly
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Offline brent j

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Re: JETTING INFO FOR 38MM CARBY TT500 XL350 1973/74 CR250 CZ400
« Reply #3 on: October 02, 2011, 05:26:58 pm »
36mm on my 500 runs

2.5 slide
210-230 main
30-35 pilot
6F9 needle
Needle jet P6-8 (159 series) I had a jetting article a few years ago that recomended 159 series needle jets for four strokes.
It didn't explain why...................

Cheers

Brent
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Offline pancho

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Re: JETTING INFO FOR 38MM CARBY TT500 XL350 1973/74 CR250 CZ400
« Reply #4 on: October 02, 2011, 06:49:18 pm »
My xt ran lean on methanol till I put a one eighth drill through it, bingo purrrfect! Cheers pancho
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