I went out to Southend yesterday and took revs up to 7000 where it sat quite happily but when I started to go uphill and the revs dropped to around 5800 it seized. So as you said it is a midrange carb setting issue, it must be. Do you know anywhere in the London area I can get my carb jetted properly as all i have tried cannot. I’m running a dellorto with reed valve 25 phbl with a 268 atomiser. Needle d22 set on top clip.
Any suggestions greatly appreciated