Im not sure what the tuners are like over in the UK, but over here, i wouldn't trust a workshop with a car, little lone a 2 stroke bike !!!

I have found a nice bit of highway where i can do some plug chops
And i have access to an AFM measuring device, i was just looking for some first hand info on a safe starting point.

Judging by your comments Dave, you think going leaner than a 145 main is a bad idea ?
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