PROP CHART FOR 2-STROKE ENGINES

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ENGINE SIZE (cu. in.)                           STARTING PROP.                                                      ALTERNATE PROPS 
.049                                              6 X 3                               5 1/4X4,  5 1/2X4,  6X3 1/2,  6X4,  7X3
.09                                                7 X 4                              7X3,  7X4 1/2,  7X5
.15                                                8 X 4                              8X5,  8X6,  9X4
.19 - .25                                        9 X 4                              8X5,  8X6,  9X5 
.29 - .30                                        9 X 6                              9X7,  9 1/2X6,  10X5
.35 - .36                                        10 X 6                            9X7,  10X5,  11X4 
.40                                                10 X 6                            9X8,  11X5 
.45 - .47                                        10 X 7                           10X6,  11X5,  11X6,  12X4
.50 - .53                                        11 X 6                           10X7,  10X8,  11X7,  12X4,  12X5
.60 - .61                                        11 X 7                           11X7 1/2,  11X8,  12X6,   
.70 - .75                                        12 X 6                           11X8,  12X7,  13X6,  14X4 
.78 - .80                                        13 X 6                           12X8,  14X4,  14X5
.90 - .91                                        14 X 6                           13X8,  13X10,  15X6, 
1.08                                              16 X 6                           15X8,  15X10,  16X6   
1.20                                              16 X 8                           15X12,  16X10,   18X6 
1.50                                              18 X 6                           16X12,  18X8,  20X6 
1.80                                              18 X 8                           18X10,  20X6,  20X8,  22X6 
2.00                                              20 X 8                           18X10,  20X6,  20X8,  22X6,  22X8

 PROP CHART FOR 4 STROKE ENGINES

 

 ENGINE SIZE (cu. in.)                               STARTING PROP.                                                  ALTERNATE PROPS
.20 - .21                                         9 x 6                           9x5,  10x4,  10x5
.40                                               11 x 6                          10x6, 10x7, 11x4, 11x5, 11x7, 12x4, 12x5 
.45 - .52                                       11 x 6                         10x7, 10x8, 11x7, 11x8, 12x5, 12x6 
.60 - .65                                       12 x 6                         11x8, 12x7, 12x8, 13x6
.70 - .80                                       13 x 6                         12x8, 13x8, 14x4, 14x6
.90 - .91                                       14 x 6                         13x6, 13x8, 14x8, 15x6
1.20                                             16 x 6                         14x8. 15x8,15x10, 16x8, 16x10, 18x5, 18x6
1.50 - 1.60                                   16 x 8                         15x10, 16x6, 18x6, 18x8, 20x6
2.40                                             18 x 10                       18x12, 20x8, 20x10
2.70                                             20 x 8                         18x10, 18x12, 20x10
3.00                                             20 x 10                       18x12, 22x8, 22x10