JW240
Active Forum User
Coincidence I know, first oil change on the new engine. Ran it etc to check levels, starting popping out the exhaust, seemed odd so checked the plugs, rear 3 were black, really black but dry. Front were ok, maybe a touch lean. Cleaned and reinstalled and still popped abit. Checked the mixture and both carbs behave as if they are lean (lifting piston causes engine to stall and die) abit lost really, not sure why it’s just started running badly but the SU carbs don’t seem to make any difference when adjusting the mixture nut, not matter how rich, it stalls and dies. They are brand new SU out the box, have about 75 miles on them, SM needles on a slightly modded 2.4 (cam, manifolds, head work, cam etc)