1989 Johnson Tracker 40hp seems to bog down at 5K rpm 23 ish mph around three minute intervals then picks back up in three seconds or so. Does not do this maxed out throttle or at low throttle. Any help would by greatly appreciated.
sounds like a fuel restriction to me. when were the carbs last serviced? post compression #'s as well. I rebuild about 6-8 of these a year, and more than half have the bottom cylinder scored. not saying thats your issue, but worth mentioning. running it for 3 full minutes repeatedly like that can easily score the cylinder/s!
Sorry I didn’t word it better but it only boggs down a couple of seconds then right back up. Happens about every three minutes as long as I am running steady. Does sound like a fuel restriction to me also. I will check filters and fuel lines and see what’s up. Thanks for you response.