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Profile | Advertised Timings | DURATION | VALVE LIFT | TAPPET | REMARKS | ||||||||||
Ex Op. | Ex Cl | In Op. | In Cl | Advertised | @ 0.050 | Gross. | @ T.D.C. | Ex. | In. | ||||||
657 | 40 | 10 | 10 | 40 | 230 | 230 | 0.340 | 0.340 | 0.004 | 0.002 | Standard 250cc | ||||
334 | 50 | 10 | 12 | 43 | 240 | 240 | 0.375 | 0.390 | 0.006 | 0.004 | Mild | ||||
385 | 57 | 17 | 19 | 55 | 254 | 254 | 0.360 | 0.370 | 0.006 | 0.004 | |||||
757 | 53 | 27 | 26 | 62 | 260 | 268 | 0.370 | 0.370 | 0.006 | 0.004 | |||||
399 | 68 | 27 | 32 | 62 | 275 | 275 | 0.375 | 0.375 | 0.006 | 0.004 | Desert | ||||
535B | 73 | 37 | 40 | 70 | 290 | 290 | 0.400 | 0.400 | 0.006 | 0.004 | Short circuit. |
Notes: -New camshafts available.
-Profiles also used in the XL,XLX and 200cc-350cc engines.
-Performance increases are not as substantial in the XL engines.
-Valve timings at 1mm valve lift.
-Hardfaced rockers are recommended with hardfaced camshafts.