This post probably should have gone in the jetting forum but because it relates to my last post (z start and stalling problem) I put it in here. In one of the responses from ncmountainman he said the z start could stall the engine if it was running rich. So today I thought I would check it out. Amazing I found I could turn the fuel screw all the way in and almost all the way out and the engine did not stall. In other words I could not make it lean enough to stall! Lightly pulling on the hot start (adding more air) made the engine rev faster so the starting point was that it was far to rich. Also opening the throttle produced an 8 stroke stutter before revving out cleanish. First job was a full clean out of the carb and blow out all the airways and check out the jet sizes. It was as a standard european model should be. Re-assembled and tried it and it was exactly the same. Changed the pilot jet for a #42. managed then to get a peak tickover about 1.5 turns out on the fuel screw and it stalled out about 1 turn either side of that setting. Off idle stutter still there but nowhere near as bad. Dropped the needle 1 notch. I had to reset the fuel screw at about 2 turns out and voila! no off idle stutter. I replaced the #48 pilot to try it but it was far to rich again so went back to #42. #45 would probably be good but I dont have one. Since then I have tried to stall out the clutch and so far using the rear brake on the carpark have not been able to do it. The bike must have been like it from new or since I fitted the exhaust as nothing else has been done that would cause it. Strange that it should be rich not lean given current emmision laws. Thanks to ncmountainman for raising the doubt. Anyone else had a similar experience?