The buyer has now admitted to changing the mix as well (only after I explained I had photos of before and after the sale). He set the screw fully home then turned it out 1.5 turns. He did no other testing as I can see. He thinks that he has richened the mix! He did it because his friend told him to!
He says that it was original set to 2.5 turns, I don't know, as I never set it because the plug was always a perfect colour. I live at 850 meters altitude and at home it was perhaps just a "little, tiny tiny" ?? lean (by response) but very marginal if not perfect (by my experiance) at 1100 to 1200 Meter altitude where I always ran it, except for 10 mins going and 5 mins back (its the free wheel down bit), I nearly always used it at quite slow revs appart from blips needed for obsticules, prefering technical difficulty than green lanes etc. Oh and of course the other difference is the change due to the pipe disconnection gearbox to carb that he made?.....
Anyone the carb expert? Who would like to make a difinitive statement, it would be appreciated and help me a lot. Thanks ALL!