I ride a smallframe with machined polini (+5mm..), Malossi Gravediggerised cylinder head, pm40, Koso 28, polini manifold with tassinari reed, spark W4AC, HP4, 4th DRT, Cranck Mazzu anticipated, Ratio 2,86. I tried this setup Mainjet: 132 Slowjet: 38 Neddle: JJJ 2nd clip position from the top Air screw: 1,5 It works nice but the spark looks a bit white.... I tried 138 for main jet but i have to put the first position for the clip ans the sparks remain white..... Do you thing it could come from the slowjet, or i maybe should try the JJH needle ... Keuk Machine