Chrysler 75 and 85 HP Outboards Service Manual OB 3646, Page 94Get this manual
The high voltageproduced in the secondary coil windingis applied to the center electrode and causes spark to jump the gap to the side electrode This spark ignites the fuel-air mixture and starts the combustion process in the cylinder UBBER BAND
The gap between electrodes is critical because it affects the entire' range of engine performance startingidlingacceleratingpower and top speed RemovalUse 13 16" deep well socket with rubber insert to protect spark plug insulation InspectionIn nearly every case of spark plug failurethe cause must be corrected before new spark plugs are installed Otherwise, servicing will be needed again in short time
Figure 57Installing Rubber Band on Coil
2Secure coil clamp assembly to C-O unit using two (2) fill head screws with lockwashershex nut