Idles too fast

[AATA]

Over the weekend I started my 1990 200HP Johnson after winterizing it at the end of last season. Started up fine, but it idles too high and won't go down. I tried lifting the lever (reving a little) to see if it would settle down, but it stays around 1300 RPM. I let it run long enough to warm up and nothing changes. Any ideas? Could a butterfly be stuck? Ran perfect at the end of last season.

I was reading some other posts and wanted to add more details. This is on muffs, but its still higher than it ever idled before. Carbs were rebuilt at the beginning of last year and linkages were adjusted 4 trips prior. Nothing has changed from last year except adding fuel stablizer to the tank and pulling the plugs and spraying lube. Read about an air leak that I will check for. Just can't imagine it developed an air leak while sitting.

Thank you!

 

[trendsetter240]

Re: Idles too fast

Over the weekend I started my 1990 200HP Johnson after winterizing it at the end of last season. Started up fine, but it idles too high and won't go down. I tried lifting the lever (reving a little) to see if it would settle down, but it stays around 1300 RPM. I let it run long enough to warm up and nothing changes. Any ideas? Could a butterfly be stuck? Ran perfect at the end of last season.

I was reading some other posts and wanted to add more details. This is on muffs, but its still higher than it ever idled before. Carbs were rebuilt at the beginning of last year and linkages were adjusted 4 trips prior. Nothing has changed from last year except adding fuel stablizer to the tank and pulling the plugs and spraying lube. Read about an air leak that I will check for. Just can't imagine it developed an air leak while sitting.

Thank you!

Actually that's not bad for running on muffs. The idle will drop somewhat when you submerge the prop, adding back pressure to the exhaust. Then in gear at idle it will drop even more.

 

[cougar1985]

Re: Idles too fast

Actually that's not bad for running on muffs. The idle will drop somewhat when you submerge the prop, adding back pressure to the exhaust. Then in gear at idle it will drop even more.

yes,remember out of the water on muffs you have no load on the motor so you will get different readings .

 

[AATA]

Re: Idles too fast

Thank you, but it's considerably higher than it ever idled before. It used to idle right around 1,000 and around 800 in the water. I will try it in the water in a few weeks, but I was just curious why it would be higher after sitting.

 

[ezeke]

Re: Idles too fast

It's probably not releasing from QuikStart, so troubleshoot the powerpack.

See "Engine Stays In Quick-Start" here: http://cdielectronics.com/downloads...linder 1988-2000 185-250 HP (Quick-Start).pdf

or here: http://cdielectronics.com/InstallSheet/113-4037.pdf

 

[AATA]

Re: Idles too fast

Thank you! That's what it seems like so I will try the links and see what I can find.

 

[AATA]

Re: Idles too fast

The information you provided was very helpful. One of the wires was corroded so I cleaned it off, sprayed a little WD40 and it works perfect.

Thank you for your help!

 

[red_chaser]

Re: Idles too fast

i have a 70hp johnson, 70el77s.

would this also be true for my engine. mine idles way fast and i have to pull back on the top lever to slow it down. dont have a tach.

 

[ezeke]

Re: Idles too fast

To red_chaser: You don't have QuikStart, but you should have a warm-up lever, which when raised would advance the timing for your cold start. If the timing advance sticks open, that would do the same thing. Watch the action at the top of your throttle lever at the engine to be sure.

 

[red_chaser]

Re: Idles too fast

would dirty carbs also cause a high idle?

 

[ezeke]

Re: Idles too fast

would dirty carbs also cause a high idle?

Improperly adjusted carburetors would be a more likely cause. Take the air silencer cover off and see if the throttle plates are fully closed when the throttle is in the idle position with the warm-up lever down. The throttle plates must be 100% synchronized through their entire range of motion and perfectly horizontal at WOT.