Bore ....64 .....66 .....68 ....68.5.....69 .....70 .....71 .....72 ....72.5 ...73 ....73.5 ...74 .....75 ....75.5....76 .....77 .....78
Stroke
54....... 347.4 369.5 392.2 398.0 403.8 415.6 427.6 439.7 445.9 452.0 458.2 464.5 477.1 483.5 489.9 502.9 516.1
+
4 58.... 373.2 396.9 421.3 427.5 433.8 446.4 459.3 472.3 478.9 485.5 492.2 498.9 512.5 519.3 526.2 540.2 554.3
5 59.... 379.6 437.9 479.4 434.9 508.5 531.1 554.3 578.2 487.1 602.7 500.7 627.9 653.8 528.3 680.5 707.8 735.9
6 60.... 386.0 410.5 435.8 442.2 448.7 461.8 475.1 488.6 495.4 502.2 509.2 516.1 530.1 537.2 544.4 558.8 573.4
7 61.... 392.5 417.4 443.1 449.6 456.2 469.5 483.0 496.7 503.6 510.6 517.6 524.7 539.0 546.2 553.4 568.1 583.0
8 62.... 398.9 424.2 450.3 457.0 463.7 477.2 490.9 504.9 511.9 519.0 526.1 533.3 547.8 555.1 562.5 577.4 592.5
9 63.... 405.3 431.1 457.6 464.3 471.2 484.9 498.9 513.0 520.2 527.4 534.6 541.9 556.7 564.1 571.6 586.7 602.1
10 64... 411.8 437.9 464.9 471.7 478.6 492.6 506.8 521.2 528.4 535.7 543.1 550.5 565.5 573.1 580.7 596.0 611.6
12 66... 424.6 451.6 479.4 486.5 493.6 508.0 522.6 537.4 544.9 552.5 560.1 567.7 583.2 591.0 598.8 614.7 630.7
Also a easy way to determin bore is: bore(in mm) x bore (in mm) x length of stroke (in mm) x .0007854 x the number of cylinders
stock bore is 64mm
stock stroke is 54mm
so a 68 mm 4mil would look like
68 * 68 * 58 * .0007854 * 2 = 421.2759936
Stroke
54....... 347.4 369.5 392.2 398.0 403.8 415.6 427.6 439.7 445.9 452.0 458.2 464.5 477.1 483.5 489.9 502.9 516.1
+
4 58.... 373.2 396.9 421.3 427.5 433.8 446.4 459.3 472.3 478.9 485.5 492.2 498.9 512.5 519.3 526.2 540.2 554.3
5 59.... 379.6 437.9 479.4 434.9 508.5 531.1 554.3 578.2 487.1 602.7 500.7 627.9 653.8 528.3 680.5 707.8 735.9
6 60.... 386.0 410.5 435.8 442.2 448.7 461.8 475.1 488.6 495.4 502.2 509.2 516.1 530.1 537.2 544.4 558.8 573.4
7 61.... 392.5 417.4 443.1 449.6 456.2 469.5 483.0 496.7 503.6 510.6 517.6 524.7 539.0 546.2 553.4 568.1 583.0
8 62.... 398.9 424.2 450.3 457.0 463.7 477.2 490.9 504.9 511.9 519.0 526.1 533.3 547.8 555.1 562.5 577.4 592.5
9 63.... 405.3 431.1 457.6 464.3 471.2 484.9 498.9 513.0 520.2 527.4 534.6 541.9 556.7 564.1 571.6 586.7 602.1
10 64... 411.8 437.9 464.9 471.7 478.6 492.6 506.8 521.2 528.4 535.7 543.1 550.5 565.5 573.1 580.7 596.0 611.6
12 66... 424.6 451.6 479.4 486.5 493.6 508.0 522.6 537.4 544.9 552.5 560.1 567.7 583.2 591.0 598.8 614.7 630.7
Also a easy way to determin bore is: bore(in mm) x bore (in mm) x length of stroke (in mm) x .0007854 x the number of cylinders
stock bore is 64mm
stock stroke is 54mm
so a 68 mm 4mil would look like
68 * 68 * 58 * .0007854 * 2 = 421.2759936