Mikuni TM28 jetting suggestions please

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Pompeydave
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Posts: 36
Joined: Thu Sep 20, 2012 1:16 am
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Main scooter: 1970 GP125
Location: Portsmouth
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Sun Sep 09, 2018 9:08 pm

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?

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Pompeydave
registered user
Posts: 36
Joined: Thu Sep 20, 2012 1:16 am
ebay user ID: pfc123
Main scooter: 1970 GP125
Location: Portsmouth
Contact:

Sun Sep 09, 2018 9:12 pm

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.

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vegansydney
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Location: New York City
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Mon Sep 10, 2018 3:04 pm

On a ‘Suzuki 190’ with K&N airfilter running via a dl/GP150/200 hose:

Main 190
Pilot 40
Needle 5D5 on 2nd clip
Atomizer 169-P0

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