I have a 70 hp 1999 Johnson outboard which has developed a problem that has me perplexed. The motor will run perfectly until it has been turned off and let sit for about half an hour (i.e. run out of the harbor without problems, turn the motor off to fish and then have issues on the ride back).
Once restarted, the motor will alternate between normal power and bogging down, this usually runs in a cycle of say 10 seconds at full power and then 10 seconds of an idle speed and then back to full power. This cycle repeats until the motor shuts off at which point, it won?t restart for a few minutes and then it?s back to the surge/lull cycle.
I have tried the following with no luck: replace gas, replace fuel line from tank to motor, new plugs, new filter, run seafoam through gas and sprayed carb cleaner in the carbs. If anyone has ideas on how to solve this issue, I?d really appreciate the help!!!
Once restarted, the motor will alternate between normal power and bogging down, this usually runs in a cycle of say 10 seconds at full power and then 10 seconds of an idle speed and then back to full power. This cycle repeats until the motor shuts off at which point, it won?t restart for a few minutes and then it?s back to the surge/lull cycle.
I have tried the following with no luck: replace gas, replace fuel line from tank to motor, new plugs, new filter, run seafoam through gas and sprayed carb cleaner in the carbs. If anyone has ideas on how to solve this issue, I?d really appreciate the help!!!