« previous next »
Pages: [1]   Go Down

Author Topic: Jet size  (Read 919 times)

Offline A10 JWO

  • Resident Legend
  • *****
  • Join Date: Oct 2012
  • Posts: 730
  • Karma: 2
Jet size
« on: 10.12. 2012 15:15 »
Hi
I am running a 600 MK1 Concentric on my 1954 standard Flash motor, which main jet should I be using please. It is currently fitted with a 170 but is untested to date.
It also has a letter 'V' stamped on the float bowl, what does this signify ?
ta Colin
Logged

Offline Rocket Racer

  • Wise & Enlightened
  • *
  • Join Date: Jun 2009
  • Posts: 1670
  • Karma: 17
  • A kiwi with a racing A10 rig and too many projects
    • NZ Classic Sidecar Racing
Re: Jet size
« Reply #1 on: 10.12. 2012 21:40 »
what bore size? 26mm?
airfilter fitted?
what octane fuel?
Logged
A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
New Zealand

Online Triton Thrasher

  • Scotland
  • Wise & Enlightened
  • *
  • Join Date: Feb 2009
  • Posts: 2004
  • Karma: 23
Re: Jet size
« Reply #2 on: 10.12. 2012 22:01 »
Give it a quick burst at full throttle. If it responds normally, increase main jet by two sizes. Repeat until it runs all blubbery at full throttle, so you know the jet is too big.  Then, decrease main jet by one size at a time, until it runs well at full throttle.
Logged

Offline A10 JWO

  • Resident Legend
  • *****
  • Join Date: Oct 2012
  • Posts: 730
  • Karma: 2
Re: Jet size
« Reply #3 on: 11.12. 2012 14:31 »
Yes 26 mm bore. Running on basic unleaded. Will have to run this in before I can give it a handful; brand new motor. will be putting a castrol adertive in the next gallon
Thanks for the replies.
Colin
Logged
Pages: [1]   Go Up
« previous next »