EngineAirplaneCarHelicopterElectronics
Outboard Marine Engines
ItemsNO.Displacement
(cc/cu.in)		Bore
(mm/in.)		Stroke
(mm/in.)		Practical RPMOUTPUT
(BHP/RPM)		Weight
(g/oz)
PRO-21M-OB 9567 3.46/0.211 16.6/0.654 16/0.630 3,000~38,000 2.1/30,000 720/25.39
PRO-21M-OB 9568 3.46/0.211 16.6/0.654 16/0.630 3,000~38,000 2.1/30,000 720/25.36
Two-Stroke Aircraft Engine Series
Item NO. A B C D E F G H S(Thread)
GP-07 9007 47.1/1.85 31.8/1.25 54.7/2.15 39.9/1.57 10/0.39 25/0.98 19.4/0.76 29.6/1.17 M4 x 0.7
GP-42 9041 75.6/2.98 52.8/2.08 82.7/3.26 65.9/2.59 17.5/0.69 40.5/1.59 32.6/1.28 48/1.89 UNF 1/4-28
GP-61 9060 91.9/3.62 64.1/2.52 104.4/4.11 82.9/3.26 25/0.98 52/2.05 42/1.65 62/2.44 UNF 5/16-24
PRO-36 9130 74.5/2.93 53/2.09 75.3/2.96 59.5/2.34 15/0.59 38/1.50 31/1.22 45/1.77 UNF 1/4-28
PRO-40 9140 84.9/3.34 60.3/2.37 86.3/3.40 69/2.74 17.5/0.69 42/1.65 34/1.34 50/1.97 UNF 1/4-28
PRO-46 9141 84.9/3.34 60.3/2.37 87/3.43 69.7/2.74 17.5/0.69 42/1.65 34/1.34 50/1.97 UNF 1/4-28
PRO-61 9160 94.9/3.74 67/2.64 104.8/4.13 83/3.27 25/0.98 52/2.05 43/1.69 62/2.44 UNF 5/16-24
PRO-91 9190 94.9/3.74 67/2.64 105.6/4.16 83.8/3.30 25/0.98 52/2.05 43/1.69 62/2.44 UNF 5/16-24
PRO-120 9195 106.2/4.18 74.4/2.93 117.5/4.63 93/3.66 30/1.18 59/2.32 48.2/1.90 70/2.76 UNF 5/16-24
PRO-120-RP 9196 117.2/4.61 74.4/2.93 117.5/4.63 93/3.66 30/1.18 59/2.32 48.2/1.90 70/2.76 UNF 5/16-24

Four Stroke Engine Series

Item NO. A B C D E F G H S(Thread)
F-54S 9800 79/3.11 57/2.24 99.8/3.93 81.5/3.21 20/0.79 44/1.73 35.6/1.40 51/2.01 UNF 1/4-28
F-75S 9802 82.2/3.24 57.4/2.26 101.6/4.00 83.3/3.28 20.0/0.79 45/1.77 36.5/1.44 54/2.13 UNF 1/4-28
F-91S 9801 92.5/3.64 66.5/2.62 117.7/4.63 95.7/3.77 25/0.98 52/2.05 43/1.69 60/2.36 UNF 5/16-24
Helicopter Engine Series
Item NO. A B C D E F G H S(Thread)
PRO-39H(R) 9604 74.5/2.93 53/2.09 76.8/3.02 61/2.40 15/0.59 38/1.50 31/1.22 45/1.77 UNF 1/4-28
PRO-50H(R) 9605 76.3/3.00 51.7/2.04 85.9/3.37 68.3/2.69 17.5/0.69 44/1.73 34/1.34 50/1.97 UNF 1/4-28
PRO-70H(R) 9607 83.1/3.27 55.5/2.19 101.9/4.01 80.1/3.15 25/0.98 52/2.05 43/1.69 62/2.44 UNF 5/16-24
PRO-90H(R) 9609 83.1/3.27 55.5/2.19 102.3/4.03 80.5/3.17 25/0.98 52/2.05 43/1.69 62/2.44 UNF 5/16-24
Car Engine Series
Item NO. A B C D E F G H S(Thread)
PRO-12BK 9459 65.3/2.57 35.5/1.4 90.4/3.56 74.4/2.93 11/0.43 31.4/1.24 25.1/1 40.2/1.58 UNF 1/4-28
PRO-12BX 9443 70.7/2.78 35.5/1.4 90.4/3.56 74.4/2.93 11/0.43 31.4/1.24 25.1/1 40.2/1.58 UNF 1/4-28
PRO-12BXP 9486 77.5/3.05 42.3/1.67 90.4/3.56 74.4/2.93 11/0.43 31.4/1.24 25.1/1 40.2/1.58 UNF 1/4-28
PRO-15BX 9444 70.7/2.78 35.5/1.4 90.4/3.56 74.4/2.93 11/0.43 31.4/1.24 25.1/1 40.2/1.58 UNF 1/4-28
PRO-15BXP 9487 77.5/3.05 42.3/1.67 90.4/3.56 74.4/2.93 11/0.43 31.4/1.24 25.1/1 40.2/1.58 UNF 1/4-28
PRO-18BKP 9488 72.1/2.84 35.5/1.4 90.4/3.56 74.4/2.93 11/0.43 31.4/1.24 25.1/1 40.2/1.58 UNF 1/4-28
PRO-18BX 9442 70.7/2.78 35.5/1.4 90.4/3.56 74.4/2.93 11/0.43 31.4/1.24 25.1/1 40.2/1.58 UNF 1/4-28
PRO-18BXP 9489 77.5/3.05 42.3/1.67 90.4/3.56 74.4/2.93 11/0.43 31.4/1.24 25.1/1 40.2/1.58 UNF 1/4-28
PRO-21B-R 9874 67/2.64 44.4/1.75 110/4.33 94.8/3.73 21/0.83 37/1.46 31/1.22 45/1.77 UNF 1/4-28
PRO-21BX-R 9475 86/3.39 44.4/1.75 110/4.33 94.8/3.73 21/0.83 37/1.46 31/1.22 45/1.77 UNF 1/4-28
PRO-28B-R 9472 67/2.64 44.4/1.75 110/4.33 94.8/3.73 21/0.83 37/1.46 31/1.22 45/1.77 UNF 1/4-28
PRO-28BD-R 9473 106/4.17 44.4/1.75 110/4.33 94.8/3.73 21/0.83 37/1.46 31/1.22 45/1.77 UNF 1/4-28
PRO-28BX-R 9477 86/3.39 44.4/1.75 110/4.33 94.8/3.73 21/0.83 37/1.46 31/1.22 45/1.77 UNF 1/4-28
PRO-50BK 9445 83/3.27 51.7/2.04 116.9/4.6 99.6/3.92 17.5/0.69 44/1.73 34/1.34 50/1.97 UNF 1/4-28
PRO-70BK(R) 9447 98.4/3.87 55.5/2.19 101.9/4.01 120.1/4.73 25/0.98 52/2.05 43/1.69 62/2.44 UNF 1/4-28
Outboard Marine Engine Series
Item NO. A B C D E F G H S(Thread)
PRO-21M-OB 9567 163/6.42 142/5.59 205.8/8.10 86.5/3.41 28/1.10 35/1.38 36.5/1.44 1.19:1 M4 X 0.7
PRO-21M-OB 9568 163/6.42 142/5.59 205.8/8.10 86.5/3.41 28/1.10 35/1.38 36.5/1.44 1.19:1 M4 X 0.7