CAM VALVE DUR. LOBE INTAKE OPEN/CLOSE VALVE
NUMBER LIFT AT .040" CNTR DESCRIPTION AND APPLICATION EXHAUST OPEN/CLOSE LASH
252-x1 .450" 276° 106° 32 btc/64 abc .006"
.450" 276" 106° 64 bbc/32 atc .006"
Must modify valve cover for exhaust lift.
Fast TT, enduro racing Mid-range and top-end power
Must use vernier cam sprocket to adjust power band.
Must use #101-Y spring kit. OK with stock piston.
252-x2 .415" 246° 106° 17 btc/49 abc .010"
.395" 245° 106.5° 49 bbc/16 atc .010"
OK with stock piston. MUST use 101-Y valve springs or equivalent.
Best all-around cam for mid-range power.
Stock .380" 232° 108° Stock Yamaha 250 TT/XT cam.
.382" 233° 108° Stock Yamaha warrior YFM, BW 350 cam.
I got the 252X1 cam, the 252X2 cam is the .415/ .395