1978 Polaris RXL Service Manual, Page 19Get this manual
TI ING CHART
556 MM Stroke
Degrees BT DC
Degrees
MM .0052 .02 11 .04 76 .00 46 .1321 .1902 .2588 .3378 .4273 .5271 .63 73 .7578 .8884 1.0293 1.1802 1.3412 1.51 21
BT DC lB 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 Spark
MM 1.69 29 1.88 35 2.00 37 2.2936 2.5130 274 17 2.9798 3.2270 3.4833 3.748 4.02 26 4.3053 4.5966 4.89 63 .2044 .5205 5.8447 .1767 Plug Gap (Inches)
1 10 11 12 13 14 15 16 17
.0002 .0000 .0018 .0033 .0051 .0074 .0 10 .0 132 .0 167 .0207 .0250 .0297 .03 49 .0404 .0463 .05 27 .0594