Late 60s/early 70s StarCraft 16’ - Mariner OB shifting/idle problems

PNWBoater

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Feb 21, 2022
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Hello to the forum! Stumbled on this great place as I was trying to understand what repairs might be needed to a boat my dad has had for a few years now.

It’s a 16 foot StarCraft Holiday and has been a great little boat to get around in the Puget Sound of Washington, drop crab pots, etc. I’d like to start using it for fishing now that I’ve moved here, but that’s a whole separate topic.

Last summer, we started having distinct issues with how smoothly it would shift into gear. It wouldn’t cleanly shift in without really shoving the single lever, dual action control far forward - with predictable results of gunning the motor. There has also been a longer running issue with the motors idle speed after being in forward gear at any real speed - when you shift into neutral the engine stays revved pretty high. Same issue coming into harbor, as the lowest speed the control unit would take you was still creating wake.

We got around the idle speed issue by shifting into neutral, lifting the black control lever and manually pushing the idle control on the motor backwards when we would come into harbor. When the shifting issue started to come up at the end of last season, we’d have one person at the motor to manually help force the motor into forward gear at the same time as the pilot was shifting the control into gear - this avoided grinding gears and allowed the motor to shift into forward gear without being revved super high.

I don’t have much experience with doing mechanic work on boats / outboard motors. I’ll very likely need to take it into a shop (although i like the idea of doing things myself if it’s something I can educate myself on), but I wanted to see what advice you veterans might have about likely diagnosis of these problems to help guide me. From what I’ve read online, I’m hoping perhaps this is an issue of needing to replace cables or perhaps needing to replace the lever control (both of which I assume/hope are much cheaper than actual engine problems). Any help or ideas are much appreciated!

I’ve also attached a couple photos for context.
 

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Watermann

Starmada Splash of the Year 2014
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Jan 12, 2013
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13,798
Welcome aboard, nice little holly. (y)

High idle on OB motors is normally due to either cable adjustment, controls or the cable itself. I would pull the cover and look at the idle lever to see if it is seating down on the stop or hanging up short causing the high idle which would also cause the rough shifting into gear.

It could just need adjusting or possibly at worse new cables.
 

merc850

Commander
Joined
Jul 7, 2010
Messages
2,046
The nuts that jam up the throttle and shift cables are loose and aren't locking the cables to the adapters, they might have been turning slowly over the years.
Like Waterman said adjustment or cables and from the looks of the box end ones I would say new cables; have you ever greased the control box?
 

PNWBoater

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Feb 21, 2022
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Welcome aboard, nice little holly. (y)

High idle on OB motors is normally due to either cable adjustment, controls or the cable itself. I would pull the cover and look at the idle lever to see if it is seating down on the stop or hanging up short causing the high idle which would also cause the rough shifting into gear.

It could just need adjusting or possibly at worse new cables.
Ok great - this is helpful advice. At the very least, I'll learn a bit more about how the mechanism works!
 

PNWBoater

Recruit
Joined
Feb 21, 2022
Messages
4
The nuts that jam up the throttle and shift cables are loose and aren't locking the cables to the adapters, they might have been turning slowly over the years.
Like Waterman said adjustment or cables and from the looks of the box end ones I would say new cables; have you ever greased the control box?
Unfortunately, I have very little info on the maintenance on the boat - my dad bought it probably 10 years ago, and I know he's taken it to a boat mechanic acquaintance a couple of times over the years. But I don't know the ins and outs of what he had done.

I doubt my dad or sister have greased the control box.
 
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