Author Topic: JETTING INFO FOR 38MM CARBY TT500 XL350 1973/74 CR250 CZ400  (Read 1504 times)

0 Members and 1 Guest are viewing this topic.

Offline jimg1au

  • Legend
  • *****
  • Posts: 3489
    • View Profile
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

Offline curly001

  • B-Grade
  • ***
  • Posts: 264
    • View Profile
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

Offline jimg1au

  • Legend
  • *****
  • Posts: 3489
    • View Profile
Re: JETTING INFO FOR 38MM CARBY TT500 XL350 1973/74 CR250 CZ400
« Reply #2 on: September 30, 2011, 04:45:32 pm »
thanks curly

Offline brent j

  • Legend
  • *****
  • Posts: 1435
  • Darwin, NT. Suzuki tragic, RL250M TS90MX PE250B
    • View Profile
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
The older I get, the faster I was

Offline pancho

  • Legend
  • *****
  • Posts: 2375
    • View Profile
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
dont follow me i'm probably off line!