Download the underlying Excel Spreadsheet
| KLR 650 | Ninja 250 | Concours | DRZ 400/DL650 | DL1000 | |||
| Stroke in MM | 83 | 41.2 | 58 | 62.6 | 66 | ||
| Calculated Stroke in Inches | 3.27 | 1.62 | 2.28 | 2.46 | 2.60 | ||
| RPM | Piston Speed FPM | Piston Speed FPM | Piston Speed FPM | Piston Speed FPM | Piston Speed FPM | ||
| 1000 | 545 | 270 | 381 | 411 | 433 | ||
| 2000 | 1089 | 541 | 761 | 822 | 866 | ||
| 3000 | 1634 | 811 | 1142 | 1232 | 1299 | ||
| 4000 | 2178 | 1081 | 1522 | 1643 | 1732 | ||
| 5000 | 2723 | 1352 | 1903 | 2054 | 2165 | ||
| 6000 | 3268 | 1622 | 2283 | 2465 | 2598 | ||
| 7000 | 3812 | 1892 | 2664 | 2875 | 3031 | ||
| 8000 | 4357 | 2163 | 3045 | 3286 | 3465 | ||
| 9000 | 4902 | 2433 | 3425 | 3697 | 3898 | ||
| 10000 | 5446 | 2703 | 3806 | 4108 | 4331 | ||
| 11000 | 5991 | 2974 | 4186 | 4518 | 4764 | ||
| 12000 | 6535 | 3244 | 4567 | 4929 | 5197 | ||
| 13000 | 7080 | 3514 | 4948 | 5340 | 5630 | ||
| 14000 | 7625 | 3785 | 5328 | 5751 | 6063 | ||
| KLR | Ninja 250 | Concours | DRZ | DL1000 | |||
| The following maximum piston speeds are from the book, Performance Tuning in Theory and Practice, by A.G.Bell. | Note: Numbers in red | ||||||
| with underline indicate | |||||||
| Stock Motor - 3,500 fpm (cast crank, stock rods and cast piston) | approximate redline | ||||||
| Heavy Duty Motor - 4,000 fpm (forged crank, peened rods w/ good bolts, forged piston) | |||||||
| Drag Racing Motor - 5,000 fpm (forged crank, alum rods, lighweight pistons, etc.) | |||||||
| KLR = 83mm | |||||||
| Ex250 = 41.2mm | |||||||
| Connie = 58.0mm | |||||||
| DRZ=62.6mm | |||||||