I got a new to me 30HP Johnson on a 15' jon boat. Rookie mistake that I didn't have him show me the boat on the water, but he did show me video's of it running. In the parking lot, he dry cranked it for about 1 second to show it cranked and cut it off. With the video's it was running full throttle no issue, it was dated a month or so before I bought it.
When I finally got it on the water, it was running a little rough on idle but some minor adjustments, got it running fine. Pissing great, idled, forward, reverse no issue on throttle to about 3/4's the way. Once full throttle, it bogs down and still runs but sputters, shakes and make a lot of racket.
I changed and gapped new spark plugs and compression tested, both at ~95 PSI. I also got it tuned from a local mechanic who got it idling perfectly and looked to diagnose the problem. He seems to think it was the throttle trigger or something like that where it won't hold time on full throttle. I've also spoken with someone who thinks it's the link sync?
This is my first boat/engine and struggling with what to do next. Planning on cleaning carb and running some seafoam through it this weekend. I'm trying to get it ready for duck season to get to the blind, and while it will get me there, it's just slow and won't get on plane.
If anyone has any resources/videos/knowledge on how to trouble shoot this, I would be greatly appreciated!
When I finally got it on the water, it was running a little rough on idle but some minor adjustments, got it running fine. Pissing great, idled, forward, reverse no issue on throttle to about 3/4's the way. Once full throttle, it bogs down and still runs but sputters, shakes and make a lot of racket.
I changed and gapped new spark plugs and compression tested, both at ~95 PSI. I also got it tuned from a local mechanic who got it idling perfectly and looked to diagnose the problem. He seems to think it was the throttle trigger or something like that where it won't hold time on full throttle. I've also spoken with someone who thinks it's the link sync?
This is my first boat/engine and struggling with what to do next. Planning on cleaning carb and running some seafoam through it this weekend. I'm trying to get it ready for duck season to get to the blind, and while it will get me there, it's just slow and won't get on plane.
If anyone has any resources/videos/knowledge on how to trouble shoot this, I would be greatly appreciated!