Engine Revs in Neutral/won't idle slow

[bferg]

Took the kids out to drag some flicker shads and ran into a mechanical issue.  I have a 25 hp Yamaha 2 stroke tiller.  When I started the motor it immediately revd way up.  I used the kill switch to cut it immediately.  It took it a second to really shut down- very strange.  Mess around some and started again.  Again it reved but I got it into gear.  It would run fine and respond to my throttle inputs both up and down- except it wouldn't idle slowly in gear.  With no throttle input it was still running like I was giving it maybe 1/4 throttle.  Had to shut it down to get it out of gear. 

Any thoughts on what it could be?  It looks like the throttle linkage is working properly.  

 

Related question:  Do you have a good Yamaha mechanic reccomendation?  

Thanks- 

[Dan the fisherman]

I don't know n e thing about what I could be.  But I take my boat to Rogers Outdoor Sports. They work on my boat and have been for 5+ years.  They do great work and have taken care of me very well. Nice group of guys on top of that. 

[fishinwrench]

Make sure that the rotating timer base (the part that turns under the flywheel when the throttle is moved) is rotating fully back to its preadjusted stop.  

Then check the idle speed screw.   It is located beside the carb(s) at the throttle cam linkage.  Turn it CC to lower idle speed.  

[bferg]

Fishnwrench- you are right the timer base isn't going all the way back.  I'm not sure why because the throttle cable seems to be fine but at least I know what is going on.  Thanks for the help!

 

[J-Doc]

Wrench loves Yamaha. 

They are his favorite. ;-)

[M_Taylor]

Don't have any clue on mechanical issues. But I'll second what Dan said about Rogers Outdoors. 

 

[bferg]

I assume there should be a spring that returns it to stop?

[fishinwrench]

11 minutes ago, bferg said:

I assume there should be a spring that returns it to stop?

The throttle cam, yes,  but the timer base....No.  Depending on the year/model it is either pulled back via cable or gear (mechanical) tension.   

It is probably dry and sticky under the flywheel and needs to be removed/cleaned/lubed/reset.  

[bferg]

so, should the throttle cam be pulling the timer base back into place?  Because the throttle cam isn't returning to full stop.  I don't see a spring on the throttle cam.  When I push the throttle cam back all the way the timer base moves with it smothely.  

[fishinwrench]

No the mechanical tiller should pull the timer base back,   the throttle cam follows under spring tension.

Don't go adjusting too much before you know what you are doing, or you'll get the throttle pickup timing all out of whack.