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New to me BF60

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Have a 2016 bf60 on a 16ft skiff with, as advertised but not confirmed, 50 hrs.
Problem I’ve generally identified is the engine sat with bad fuel for a while. Had water in the tank which I’ve drained and fixed and a few bad fuel lines and bulb.
Early issue was the motor would run great and then jump rpm in the mid range and never get to wot. She’d eventually die and not want to restart. Believe we’ve fixed that by cleaning out the low pressure pump, vst, high pressure filter and cutting down the oring in the high pressure filter that tends to be an issue. I’ve also had the injectors cleaned.
After all that, I put the boat in the water and it’s now running really rough at idle and low rpm’s but under load and in neutral. The rpms are surging. This is a new issue. After running for about 10 minutes to se if things settled out, i shut it down and went to turn it back on. This time the starter motor wouldn’t crank. That eventually sorted itself out and again it turned over immediately but back to the surging rpms.
Any thoughts as to the new issue/ continued issue here?
 
Should mention I disconnected and then re connected the battery before it went back in the water as I was doing some other work and needed to remove it…
 
Clean the battery terminals and retighten.

I’d run a heavy duty load of sea foam through it, use a portable gas tank with premium non ethanol, it may cure your issues if your problems are from old fuel. This is easy to do and if it doesn’t work, then you can ask for more advice here.
 
Thanks nsdon. Ran the boat for an hour today off an aux tank with treatment. Ran great. Have one intermittent issue. I grabbed a mooring and shut her down for 15 minutes. Went to start her and got 1 beep (not two) and then wasn’t able to crank. I messed around with the shifter enough to get the neutral safety switch to engage and then was fine again for another hour.
I’m remembering that last week after the engine was worked on there was a loose connector between the shifting cable and whatever that runs to on the engine side. I moved a “clip” which seemed like it was open but should be closed.
Does anyone have a diagram of what that should look like?
 
Could be a loose wire connection or the shifter needs adjustment. Try holding the key in start while slowly moving the shifter back and forth.

Do you have a side or top shifter?
 
No experience with the 60 tiller, sounds like a loose connection, hopefully someone with experience can help.
 
Had a full day on the boat today. Definitely a loose connection. After finding where the switch is and taking note of the shifter position - realized that neutral doesn’t always depress the switch enough. Pulling a half inch back into reverse does. Just need to adjust the connection a bit to fix it.
Still running treatment through the system from an external tank. Had about 3 hours of run time and she sounded great.

Thanks for the guidance on this. Appreciate it.
 
Glad it’s working so much better. I use sea foam in all my seldom used engines, carbed and FI, antique car, mowers, chainsaw, generator, etc., and once a year in my regularly used stuff like my 1998 pickup. Never have any fuel related issues with any of them. And use good ethanol fuel in anything seldom used.
 
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