Author Topic: Outboard: high revs when shifting back to Neutral  (Read 156 times)

Offline ChuckD

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Outboard: high revs when shifting back to Neutral
« on: March 13, 2017, 01:07:40 AM »
2017 Suzuki DF2.5
. Starts on first pull, idles great.
. I pull away from the dock. Six minutes later I point into the wind, hoist the sails.
. When I shift into Neutral the engine races - really high revs. It'll do that for at least a minute if I let it (even if I goose it a few times).

The problem is:
As I approach the dock, I shift into Neutral to control boat speed (and the engine races). When I re-engage Forward for that final push 20 feet from the dock, the engine slams into gear (as does my mild OCD). And one of us - I think it's the outboard - has a "Sunova!" thought bubble above their head.

Anyone have any ideas why this is happening? Thanks! Chuck
« Last Edit: March 13, 2017, 01:57:29 PM by ChuckD »
s/v Walt Grace (CP16)
Sequim, WA

Offline alsantini

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Re: Outboard:
« Reply #1 on: March 13, 2017, 07:50:46 AM »
Chuck:  First a question.  How does the engine move the boat under load?  Does it have the control that it normally has?
I have a thought regarding the racing engine.  Normally if the air fuel ratio is correct an engine will idle and pull well.  However if there is a vacuum leak, the idle will be unusually high.  When this occurs, pull the choke slightly.  If it is a lean condition it will come down with the application of the choke. I would check the carb base nuts.  If one or both are slightly loose, air leaks into the manifold, the A/F ratio goes lean and the speed goes up.  BUT, normally when this happens the ability of the engine to operate under load is usually impacted.  Good luck and keep us all posted when you figure it out.  Sail On.  Al

Offline ChuckD

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Re: Outboard:
« Reply #2 on: March 13, 2017, 01:58:31 PM »
Thank you, Al.
She runs great under load!
I'm really happy with the motor's performance, except when shifting back into Neutral. (And it's done the high-rev thing since day 1.)

I will check out carb base nuts - thanks!
Chuck
s/v Walt Grace (CP16)
Sequim, WA

Offline mikew

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Re: Outboard: high revs when shifting back to Neutral
« Reply #3 on: March 13, 2017, 07:58:47 PM »
Chuck,no direct experience but found the following. Checked on other forums on the 2.5 hp, and other owners report a common problem is stalling under load. So if you turned down the idle stop screw  at neutral to normal idle speed would the engine stall under load.? They report the fix is to
adjust mixture screw on carb  which is under a fixed metal cap that needs to be drilled out to access mixture screw. Found a you tube link to this : http://youtu.be/o2xpV9CJCNc
But if engine is 2017 maybe this would void warranty, bring to dealer first.?
Is it possible that from day 1 the idle was turned up by the dealer to mask this problem ?

Mike
« Last Edit: March 13, 2017, 08:53:41 PM by mikew »

Offline ChuckD

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Re: Outboard: high revs when shifting back to Neutral
« Reply #4 on: March 14, 2017, 12:48:02 AM »
Mike, thanks.
The idle is perfect until I shift from Froward to Neutral.
s/v Walt Grace (CP16)
Sequim, WA

Offline ChuckD

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Re: Outboard: high revs when shifting back to Neutral
« Reply #5 on: March 17, 2017, 11:25:31 PM »
Guys - thank all of you for your input!
I posed this question on 3 other popular forums...
Had hundreds of Views, but but one Reply!

Leave it to CPYOA to come through.
Good Karma to each & every one of you!
Chuck
s/v Walt Grace (CP16)
Sequim, WA

Offline alsantini

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Re: Outboard: high revs when shifting back to Neutral
« Reply #6 on: Today at 08:40:38 AM »
Chuck:  Any final words on the outboard?  I (we) are always interested in what really was going on and the final disposition of the problem.  I spent some time on my old outboard a few days ago, mostly checking it over and it made me wonder what went on with yours.  Sail On      Al