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2-23 2 CYLINDER HEAD VOLUME SPECIFICATIONS NOTE: For accurate reading when using the head installed volume method, subtract 2.44 cc from the total amount of fluid used (if using a BR9EYA spark plug) or 2.20 cc (if using a BR9ES spark plug). CRANKSHAFT RUNOUT SPECIFICATIONS 728-144A NOTE: Measure in from the shaft end the specified amount when checking runout at points D-F. When checking runout in the center, place indicator on center of bearing as shown at Point E. Maximum runout at any of the 3 measuring points is ±0.05 mm (0.002 in.). ENGINE TYPE SQUISH - GAP HEAD INSTALLED VOLUME (cc) FLAT PLATE VOLUME (cc) 370 cc mm 2.27-2.95 in. .089-.116 19.1-22.0 24.3-25.1 440 cc mm 1.39-1.87 in. .055-.074 20.4-26.4 25.2 700 cc “Laydown” mm 1.5 in. .059 30.5 34.5 570 cc mm 1.3 in. .051 27.01 28.8 550 cc mm 1.41-1.94 in. .056-.076 23.5-26.5 34.4-35.0 500 cc mm 1.4 in. .055 22.43 20.45 600 cc (STD) mm 1.36 in. .054 27.8 28.4 600 cc “Laydown” mm 1.5 in. .059 25.0-27.6 29.7 800 cc mm 1.58 in. .062 34.6 38.3 900 cc mm 1.36 in. .054 34.1-38.0 39.9 ! CAUTION The above specifications are not intended to be used for engine modification. Reducing the head volume Engine Bore X Stroke A B C G Runout D, E, F Point 370 cc mm 440 cc (in.) (± .002) 60 X 65 65 X 65 100 ± 0.15 (3.937 ± 0.006) 55 ± 0.15 (2.165 ± 0.006) 100 (3.937) 22 (0.866) D 35 (1.377) F 22 (0.866) 700 cc mm (in.) (± .002) 79.7 X 70 119.7 ± 0.15 (4.712 ± 0.006) 64 ± 0.15 (2.519 ± 0.006) 118 ± 0.4 (4.645 ± 0.015) 30 (1.181) D 5 (0.196) F 5 (0.196) 550 cc mm (in.) (± .002) 73.4 X 65 112.5 ± 0.15 (4.409 ± 0.006) 60 ± 0.15 (2.362 ± 0.006) 106 ± 0.4 (4.174) 27 (1.062) D 30 (1.181) F 5 (0.197) mm 500 cc (in.) (± .002) 71 X 63 114.7 ± 0.15 (4.515 ± 0.006) 66.5 ± 0.15 (2.618 ± 0.006) 106 ± 0.4 (4.465 ± 0.015) 27 (1.062) D 5 (0.196) F 5 (0.197) mm 600 cc (STD) (in.) (± .002) 78 X 62.7 114 ± 0.15 (4.88 ± 0.006) 66.5 ± 0.15 (2.62 ± 0.006) 105.8-106 (4.165-4.173) 30 (1.2) D 30 (1.181) F 5 (0.197) 600 cc (“Laydown”) mm (in.) (± .002) 73.8 X 70 119.7 ± 0.15 (4.712 ± 0.006) 64 ± 0.15 (2.519 ± 0.006) 118 ± 0.4 (4.645 ± 0.015) 30 (1.181) D 5 (0.196) F 5 (0.196) 570 cc mm (in.) (± .002) 73.8 X 66 119 ± 0.15 (4.70 ± 0.006) 62.3 ± 0.15 (2.45 ± 0.006) 109.7 (4.320) 24 (0.945) D 30 (1.181) F 15 (0.590) 800 cc mm (in.) (± .002) 81 X 76 125.5 ± 0.15 (4.94 ± 0.006) 68 ± 0.15 (2.68 ± 0.006) 123 + 0-0.4 (4.84 + 0-0.015) 30 (1.2) D 30 (1.181) F 15 (0.590) 900 cc mm (in.) (± .002) 85 X 76 125.5 ± 0.15 (4.94 ± 0.006) 68 ± 0.15 (2.68 ± 0.006) 123 + 0-0.4 (4.84 + 0-0.015) 30 (1.2) D 30 (1.181) F 15 (0.590) |