Idling speed question

[Dusky 13]

So my 70 hp yamaha 2 stroke which I just bought used idles between 1200 1300 the manual says this motor should idle around 800 +or-50 any thoughts

[ausnoelm]

it requires some educated adjustments/synching, or it has perhaps an air leak?

[Dusky 13]

it requires some educated adjustments/synching, or it has perhaps an air leak?

Could I just adjust the carbs to lower the idle speed or will a problem like this require a more in depth fix

[boscoe99]

If the carburetors are in good working order, are properly synchronized and there are no air leaks, then yes they can be adjusted to the proper specification.

[throrope]

IMHO these 3 cyl two stroke outboards were built for work. All linkage adjustments are referenced from markings on the block. Most repairs can be accomplished with simple hand tools. I suggest ordering a service manual from YAMAHA MANUAL STORE. It clearly describes all adjustments. With one use it pays for itself.

If you're near Wanchese, NC, you could take an easy and successful path and leave it with Joe's Marine service. Ask for Tom.

Good luck, hope this helps and keep us posted.

[99yam40]

So my 70 hp yamaha 2 stroke which I just bought used idles between 1200 1300 the manual says this motor should idle around 800 +or-50 any thoughts

Check your timing also, it is part of the link and sync you need to do every time you put the carbs back on

Timing too far advanced can cause high idle RPM

[DennisG01]

Is this on a hose, or in the water (or bucket)? I have much more experience with stern drives than outboards, but from my experience with OB's, they always seem to run a little high out of the water due to less backpressure (from lack of water against the exhaust).

[Dusky 13]

Is this on a hose, or in the water (or bucket)? I have much more experience with stern drives than outboards, but from my experience with OB's, they always seem to run a little high out of the water due to less backpressure (from lack of water against the exhaust).

I am running it on a hose using haven't put it in the water yet after cleaning carbs