Farmer42
Club Member
There is a needle comparison chart on the Burlen website that gives you jet size against the relevant fuelling and performance for each compatible needle.
There are various tabs within it and you can manipulate or fill in the chart in the basic tab. F stands for fixed needle which is HS6 or Hitachi's, s is for sprung and Z is for zenith/ Stromberg. The number after it is the jet diameter e.g. F100 is fixed needle at 0.100 inch. Most 1 3/4 inch carbs run F100 nozzles. The number at each index point shows the diameter of the needle at that point. The bigger the diameter the leaner it will run at certain revs.
RH needles on these jets will run very lean top end which will be compounded the bigger engine size you have. I would recommend looking at DX or MC needles. If you run HS6 or HS8(2 Inch) you could use F125 jets with compatible needles such as UA that would give you more fuelling at higher revs which would be needed on a bigger engine.
I'm running HS6 carbs with F100 jets and DX needles and it runs great with good torque & performance on a stock E88 head and exhaust setup. I have a L26 engine.
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There are various tabs within it and you can manipulate or fill in the chart in the basic tab. F stands for fixed needle which is HS6 or Hitachi's, s is for sprung and Z is for zenith/ Stromberg. The number after it is the jet diameter e.g. F100 is fixed needle at 0.100 inch. Most 1 3/4 inch carbs run F100 nozzles. The number at each index point shows the diameter of the needle at that point. The bigger the diameter the leaner it will run at certain revs.
RH needles on these jets will run very lean top end which will be compounded the bigger engine size you have. I would recommend looking at DX or MC needles. If you run HS6 or HS8(2 Inch) you could use F125 jets with compatible needles such as UA that would give you more fuelling at higher revs which would be needed on a bigger engine.
I'm running HS6 carbs with F100 jets and DX needles and it runs great with good torque & performance on a stock E88 head and exhaust setup. I have a L26 engine.