Help with stihl 461

[Tothemax]

Hello,

I have a 461 that is giving me fits. It came to me for a tuneup. Compression is 140psi. New ngk spark plug installed, I cleaned the air filter and cleaned the ignition module as it was caked with junk. I gapped it with a business card.

Fuel filter looks good. I also checked the spark arrestor and it's clean.

It starts and runs well. When you peg the throttle it goes up to 13-13500 and bounces around a little. It sometimes jumps above 14k.

Any idea why?

 

[frogbite]

You failed to explain the problem.
Once again, what "EXACTLY" is your problem?

 

[Tothemax]

The last paragraph about bouncing high end rpms. 5-1k seems like a lot.

 

[frogbite]

Crank seals are gettin weared, should only be a problem at idle though. Perhhaps it only needs to enrichen the carb at wot.

 

[ElevatorGuy]

No load or in the cut?

 

[lone wolf]

No load or in the cut?

I would think no load.

Crank seals are gettin weared, should only be a problem at idle though. Perhhaps it only needs to enrichen the carb at wot.

Maybe.

 

[Tothemax]

No load.

I have 3 others here too. Same model #s. The others don't do it.

 

[huskihl]

461 has a 13,500 limited coil. Tachs go haywire once the saw hits the limiter. I’d richen it up to bring it just below the limiter and try it

 

[PV Hiker]

Perhaps you missed this post to help explain you bouncing around the max RPM with the limited coil.
https://www.arboristsite.com/threads/tuning-with-a-limited-coil.366668/

 

[Tothemax]

Interesting. I had no idea.

So how do you tune one if you don't have access to a log to put them into?

 

[huskihl]

Interesting. I had no idea.

So how do you tune one if you don't have access to a log to put them into?

You can tell when it hits the limiter. If you start with the H jet rich and then lean it out 1/4 turn at a time and test in 1–2 second bursts, you can tell when it quits climbing. That is 13,500. And then I would richen a little bit from there to be safe.

 

[Tothemax]

Copy. Thanks

 

[stihltech]

Please put in a new fuel filter. NEVER trust a used one. I don't care how nice it looks.