Crikey thats getting a bit techo isn't it?! Any oil burning or air leaks in the exhaust will upset any readings. 6% is a little on the high side but if its happy there i wouldn't be concerned. About 3% to 4% would be pretty good but old engines, low compression, bad combustion chamber etc. Just wind mixture screws in till it goes off song, then out till same & set screws in middle of that.
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T33285 Mk1 Universal Carrier, Wolseley 1941
GMC 1942 CCKW 121922-2
Diamond T 968A 1082
Diamond T 968A 2834
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