Engine Specifications
Size
Disp
(cc)
Bore
(mm)
Stroke
(mm)
Output
(hp/r.p.m.)
Crankshaft
Weight
(oz)
Prop Size
Practical Range
Parts
39A
6.34
21.8
17
1.15/17000
1/4*28
15.6
9*6
2800/14000

46A
7.45
22
19.6
1.4/17000
1/4*28
16.61
11*6
2500/11200
56A
9.48
23.64
21.6
1.65/17500
1/4*28
16.61
11*6
2500/12200

61A
9.97
23.5
23
1.8/17500
5/16*24
25.96
12*6
2500/11800

75A
12.25
25.5
24
2.1/17000
5/16 * 24
25.96
13*6
2500/11500
 
91AR
14.9
28.12
24
2.4/17000
5/16 * 24
25.96
13*8
2500/10500