THIS IS FOR CRF50 CRF70 TRX90 STOCK TYPE CAMS THIS WORKS ON THE LIFAN 140CC ENGINES IF YOU USE A HONDA TYPE 2 BOLT CAM @ *28_TOOTH CAM SPROCKET FOR THE OEM HONDA TYPE BEARING CAMS 14321-GBG-900 1/22A (200025) 200025 @ *GUIDE PIN 8_X_12 94301-08120 1/22M (48F)all 50's and 70's take 2 of these between the cylinder and cases. this will also work as the center dowel for the cam sprockets that have them. like all trx90's, all xr50 crf50 xr70 and crf70's cam's have. 48F @ *CAM SPROCKET SPECIAL BOLT SOLD_EACH 90083-035-010 7/21M (R2103) THESE BOLTS ARE SOLD EACH AND THERE ARE THREE PER 50cc AND 70cc. THEY HOLD THE CAM TIMING SPROCKET TO THE CAM SHAFT. R2103