I have a peugeot 103 sp 1979 stock cylinder stock de restricted exhaust and stock gurtner 12mm carb the jet currently in is stampted 245 which i think is a 5012n 62 i recently installed a polini reed valve and get better acceleration but the plug still looks like its running a bit rich as its dark and oily looking (50:1 oil mix) i have a 64 jet which is a Chinese copy and if i put this in the ped goes to 20mph then bogs down so i dont think this is right maybe because its a copy looking at the attached picture i think i have the 5012n 62 jet would people recoment upjetting to a new old stock gurtner 5012 jet 63 (250) or 64 (255) ? I can get a new 70s gurtner 64 but am struggling to find a 63 (250)
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