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hi guys and gals im in the market to upgrade my old pro x 125 to a 150, but im unsure which engine to go with, Can any one tell me which of these will be preferable ; the gpx oil cooled 150 from dhz, the lifan oil cooled 150 from kdf sport, or the dirtmax avenger....... my old pro x has a 17"...

hi all i have a ducar 125cc engine with a blown top end and a lifan 140 with a shagged bottom end . can i fit the 140 top end to the 125 bottom end . do they both run the same stroke? i know the gear box and clutch configuration is no-where near the same but im willing to give it a go..... ANY...

hi all im trying to fit a zongshen 250cc engine to my old xl 250, apart from all the mounts being different witch is no real problem after making custom engine mounts, i am trying to wire the new engine into the existing wiring harness to retain all the factory switches and features as...