| JS lightweight bare pistons med C.R. | 750cc = 183 g forged or 175 g billet | 850cc = 200 g forged or 185g billet | 920cc = 210 g forged |
| Stock Hepolite bare pistons | 750cc = 250 g | 850cc = 317 g | |
| JS bushless Carrillo rods | small end 105 g | big end 326 g | |
| JS bushless Ultralight Carrillo rods | small end 95 g | big end 307 g | |
| JS DLC pin | 750cc = 51 g | 850cc = 58 g | 920cc = 58 g |
| Stock pin | 750cc = 68 g | 850cc = 72 g | |
| JS Beehive valve spring | 42.3 g | TI retainer 4.7 g | Beehive street seat pressure 90 lbs Beehive race seat pressure 130 lbs |
| RD racing spring | 59.3 g | TI retainer 10.8 g | RD race seat pressure 130 lbs |
| Stock spring | 59.7 g | steel retainer 16.1 g | Stock street seat pressure 90 lbs balanced with shims. 100+ lbs shimmed for racing |
| JS (BSA) radiused lifter | 38 g | ||
| Stock flat lifter | 74.6 g | ||
| JS pushrod | 31 g | ||
| Stock pushrod | 32 g |
| JSM beehive springs, Free Length 1.845" | Installed height | pressure |
| 1.700 | 35 | |
| 1.650 | 46 | |
| 1.600 | 58 | |
| 1.550 | 70 | |
| 1.500 | 81 | |
| 1.450 | 93 | |
| 1.400 | 106 | |
| 1.350 | 121 | |
| 1.300 | 133 | |
| 1.250 | 147 | |
| 1.200 | 165 | |
| 1.150 | 185 | |
| 1.100 | 205 | |
| 1.050 | 225 | |
| 1.000 | 240 | |
| 0.950 | 256 | |
| coil bind .9 (.880 actual) | 0.900 | 272 |
