Just starting to diagnose intermittent spark(hard starting/bogging on water) on cylinders 1 and/or 3.
Day 1 diagnosing-- motor starts hard (on muffs).Check for spark on plug wires with timing light. #1 and #3 dead somehow started on just cylinder 2. Do quick compression test. 90-70-90 (not at WOT). Figures it starts on the worst compression cylinder. Put plugs back in and motor started right up. Spark on all 3 cylinders now motor working great. Did 1 can Seafoam to 1gal gas decarb to try to help compression in #2.
Day 2-- motor starts hard again.No spark in #1 this time. Check compression to see if Seafoam treatment helped.Still 90-70-90 darn! Put plugs back in, starts right up with spark on all cylinders. Put boat in water,starts,idles and runs perfect. That lasted for about a week and now the motor is hard to start again.
Any idea why the spark is coming back to all 3 cylinders after a compression test?
BTW I am going to run the motor until it blows up with the bad compression. The boat can still do 36 mph. DVA adapter just arrived today and trying to not replace any unnecessary parts on a dying motor
Day 1 diagnosing-- motor starts hard (on muffs).Check for spark on plug wires with timing light. #1 and #3 dead somehow started on just cylinder 2. Do quick compression test. 90-70-90 (not at WOT). Figures it starts on the worst compression cylinder. Put plugs back in and motor started right up. Spark on all 3 cylinders now motor working great. Did 1 can Seafoam to 1gal gas decarb to try to help compression in #2.
Day 2-- motor starts hard again.No spark in #1 this time. Check compression to see if Seafoam treatment helped.Still 90-70-90 darn! Put plugs back in, starts right up with spark on all cylinders. Put boat in water,starts,idles and runs perfect. That lasted for about a week and now the motor is hard to start again.
Any idea why the spark is coming back to all 3 cylinders after a compression test?
BTW I am going to run the motor until it blows up with the bad compression. The boat can still do 36 mph. DVA adapter just arrived today and trying to not replace any unnecessary parts on a dying motor