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After a long road of troubleshooting, im still having trouble with my 1989 mercury 2 stroke 60hp outboard. My top speed is 7mph (on a 15ft fiberglass bass boat), and I just sent it in to the shop where they told me I had a spun prop, bent prop shaft, corroded carrier bearing etc., and they...

Good to know, thank you Chris.

Motor is an ‘89 mercury 60hp 2 stroke outboard. Motor will increase RPM’s smoothly, but would result with no speed increase.

Yes, boat would move gradually up until about half throttle. Then with throttle increase, there would be no difference in speed. Motor is in good condition, but this boat is new to me so I’ve never actually seen it at it’s full potential.

I recently was having a speed issue on my bass boat (60hp outboard on 16’ fiberglass boat). Would only top out around 7 mph, so I took it down to my local marine shop. They got back to me, and told me that my prop was spun. I am familiar with the issue, and am debating on if I should have them...

After further examination, running the boat on muffs, ive found that my prop wobbles quite a bit when in forward. Also, when in neutral, if I turn the flywheel, my prop will turn as well. The prop doesn’t feel “geared” in when this happens, as I can stop it from moving by holding it back with my...

I was able to rule out a spun hub by making a scratch mark on the hub and prop and found through multiple trips on the pond that the hub and prop marks are still aligned- no slippage at all.

I’ve now ruled out that I have sufficient spark in all 3 cylinders (more than a 3/8 air gap), compression has checked out, and my throttle linkage appears to be visually fine. I am now leaning more toward my timing advance. I am not sure what a normal setting is on this, I will have to look in...

Hi Lance, thanks for the response. I have considered upgrading to something with higher HP…

Okay, I suppose I could switch the top spark plug wire with one of the “good” ones and see if that makes a difference on that cylinder?

I have an interesting find. I did a compression test myself and what I found was the 1st cylinder has 120 psi while the bottom two cylinders both have 140 psi. I would imagine this would explain why the engine doesn’t die when I pull the top cylinder spark plug, and would also explain for the...

I did some more troubleshooting today. When running outboard, I found that by unplugging spark wire to cylinder 1, there was a minor audible difference to engine running but engine still ran. When unplugging cylinders 2 and 3 spark wires, the engine died immediately. I tested resistance on each...

Thank you for your response, I will check more tommorow on coil pack/spark. I did do a spark test with a tester and did see spark but as you noted, coil pack might not be giving enough power. I will look into that

I had it in a marine shop recently and my mechanic said he saw good compression in all cylinders. Unfortunately I don’t know any numbers:/

I had it in a marine shop recently and my mechanic said he saw good compression in all cylinders. Unfortunately I don’t know any numbers:/

I have spark and good compression in all cylinders. I’ve checked my throttle cables as well and all linkages/controls are working fine.

I recently took my (new to me) bass boat out for its first maiden voyage. I’ve been fixing it up as a winter project and it has an 89’ 60hp Mercury 2stroke outboard. As I opened her up to full throttle down the pond, I couldn’t help but notice that I was topping out at a painfully slow pace. My...

I will double check the vent tonight, but the anti-siphon is open

Yes this was the first time running the built in tank and new hose. I have pumped gas in with the primer and while doing a carb clean, the bowls were full of gas so I can’t see what the problem would be with the tank and hose. I am also using the correct 50:1 oil mix with AV gas. With the old...

I have a Mercury 60hp 2 stroke outboard, and a few months back I used an open tank of gas and an open ended (cut) hose that I plugged into my outboard and dumped the other end into the tank. The boat ran fine several times with this method, and I was only using just to test motor. After getting...