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Mikuni TM28 jetting advice please
Posted:
Sun Sep 09, 2018 9:09 pmby Pompeydave
Hi all, I’ve got an Italian GP125 with GP200 gearing, a Casa 185 kit that has been bored out to 198, a BGM electronic ignition timed at 20 BTDC, a BGM big bore exhaust and a Mikuni TM28 carb. The carb is the new item. Can anyone suggest jetting, a needle and an atomiser please?
Re: Mikuni TM28 jetting advice please
Posted:
Sun Sep 09, 2018 9:11 pmby Pompeydave
By the way the cylinder set up is with the squish set at 1.5mm and the piston sits at 1mm above the bottom of the exhaust port at BDC.
Re: Mikuni TM28 jetting advice please
Posted:
Mon Sep 10, 2018 10:45 amby Norrie Bodge
Taken from here m8 but thinking as a starter point 4u ->
http://www.smellofdeath.com/lloydy/carb ... %20exhaustLambretta 190 stage 5 Suzuki conversion with Mikuni 28mm & big bore exhaustneedle jet =169-08
main= 180
pilot=40
needle=2nd from top of clip or middle
Re: Mikuni TM28 jetting advice please
Posted:
Mon Sep 10, 2018 11:35 amby bike grim
I can’t assist with jetting advice but I would be cautious about your timing, at least whilst you are trying to set up. I’d be working on 18 or even 17 Deg BTDC to take account of modern fuel
Re: Mikuni TM28 jetting advice please
Posted:
Mon Sep 10, 2018 10:12 pmby Pompeydave
Hi chaps, thanks for the replies- I'll try that setup first Norrie, cheers. Bike Grim, yeah know what you mean re timing- I only left it at that as my BGM stator slots need enlarging to get it to move round to -16/17, and I haven't got a decent Dremel attachment or grinding bit to do it at the moment.
Anyway, I'll try it with needle jet =169-08, main= 180, pilot=40, needle=2nd from top of clip or middle, and report back.