460 bogging in willow.

[RiverRat2]

bottom stays for the air baffle

Here's a pic of the white nipple I am inquiring about.

Man If your going throw out that 25" bar like Windthrown suggested If its a stihl bar Ill take it:yoyo: :yoyo: on that filter you need to take it off & blow through it... it should have 0 restriction.... there is a screen on the fuel pump side of the carb it should be clean pull it out carefully and make sure there is no trash behind it or in your main jet,,,,, It seems like to me you are running out of gas just enough on high demand that you saw is not making rated KW,,,,,,,, its getting If you have the reapair manual it will tell you check the fuel inlet control lever setting and all that,,, did you put a kit in it????? Im like Lakeside something stupid is starving your saw for fuel,,,tank vent,,,, grrrrr
dumb @#!*^7% or something

 

[wdchuck]

Man If your going throw out that 25" bar like Windthrown suggested If its a stihl bar Ill take it:yoyo: :yoyo: on that filter you need to take it off & blow through it... it should have 0 restriction.... there is a screen on the fuel pump side of the carb it should be clean pull it out carefully and make sure there is no trash behind it or in your main jet,,,,, It seems like to me you are running out of gas just enough on high demand that you saw is not making rated KW,,,,,,,, its getting If you have the reapair manual it will tell you check the fuel inlet control lever setting and all that,,, did you put a kit in it????? Im like Lakeside something stupid is starving your saw for fuel,,,tank vent,,,, grrrrr
dumb @#!*^7% or something

Soooo, the bar is salvageable? I'm all ears. Too much pack rat in me to toss it, four more and I have a cool ceiling fan.:biggrinbounce2:

"fuel inlet control lever setting" ? greek man.
No kits, the DP from Stihl is the only thing I've tried.
Where is the tank vent?

I'll gladly follow up on suggestions, just need to understand what yer referring to.

 

[SmokinDodge]

Soooo, the bar is salvageable? I'm all ears. Too much pack rat in me to toss it, four more and I have a cool ceiling fan.:biggrinbounce2:

"fuel inlet control lever setting" ? greek man.
No kits, the DP from Stihl is the only thing I've tried.
Where is the tank vent?

I'll gladly follow up on suggestions, just need to understand what yer referring to.

Ok, item number 5 is the fuel inlet lever that operates the needle in the carb.

View attachment 43463

 

[PES+]

Last post on this for me...I'll let the experts take it from here

If you had a restriction in fuel flow I doubt very much you would be showing the black oily carbon which as the dealer told you is an indication of too rich a mixture. It is possible but I doubt it you may have a bad needle lever that is causing problems but I doubt that too as it would screw up more and have more symptoms. The screen and the lever/needle are under the 4 screw steel cover on the carb. Can you run it again and snap a pic of the new plug? That old plug still is weird looking. total lean on one side and total rich on the other side of the electrode.
If I knew how the old plug indexed (lined up) in the head I could give some possible causes as I have seen similar type burns but never to that extreme

I know God forbid Stihl could EVER make a mistake on a saw:hmm3grin2orange:

 

[SmokinDodge]

Soooo, the bar is salvageable?

Where is the tank vent?

Take the bar off the saw, roll the chain around it by hand. For comparison do the same with your 20" bar to get the feel for it. The back side of the drive links may be mushroomed a bit causing some of the problem. Check it for straightness with a yard stick held on edge against the rail where the chain rides, top and bottom. Not the absolute best way but will give you some idea.

The tank vent will be on the left side of the saw above the fuel tank lid under the air cleaner cover. I know the on the older saws some it is a clear line with a screw in the end and some have a plastic 'tower' vent. Should be on the opposite side of your 'nipple' you asked about. :hmm3grin2orange:

 

[windthrown]

OK, here is what they say about the MS 460 model...

From the Stihl web site:

The MS 460 is a tough, high-performance saw that's easy to use and maintain. It has more engine power and more torque than the MS 440, yet weighs only 14.6 lbs. A lightweight flywheel makes limbing easier. An optimized anti-vibration system and decompression valve ensure quicker starts and smoother operation.

From an ad in the UK:

STIHL MS 460 : This STIHL powerful professional chainsaw is designed for heavy duty use in extreme conditions. The high engine power and relatively low weight makes it ideal for use in dense stands, as well as for cutting hard wood.

 

[PES+]

You are running the correct gauge chain for the bar right? If you are running full chisel .50 in a .63 bar you will get binding and all sorts of bog as the back angle on the full chisel pulls the cutters to the sides as it cuts

 

[wdchuck]

You are running the correct gauge chain for the bar right? If you are running full chisel .50 in a .63 bar you will get binding and all sorts of bog as the back angle on the full chisel pulls the cutters to the sides as it cuts

3/8-.050 , both bars. chains are all 3/8-.050.

the sprocket on the 24 is kind of wobbly, if I hold opposing teeth, it rocks on its bearing/shaft?. It's an ES bar, is this a replaceable tip configuration?

THanks for help everybody.

 

[PES+]

Yes..the ES tip is replaceable

http://www.stihlusa.com/chainsaws/guidebars.html

 

[Lakeside53]

If you had a restriction in fuel flow I doubt very much you would be showing the black oily carbon which as the dealer told you is an indication of too rich a mixture. It is possible but I doubt it you may have a bad needle lever that is causing problems but I doubt that too as it would screw up more and have more symptoms. The screen and the lever/needle are under the 4 screw steel cover on the carb. Can you run it again and snap a pic of the new plug? That old plug still is weird looking. total lean on one side and total rich on the other side of the electrode.
If I knew how the old plug indexed (lined up) in the head I could give some possible causes as I have seen similar type burns but never to that extreme

I know God forbid Stihl could EVER make a mistake on a saw:hmm3grin2orange:

The inlet screen is on the body under the pump side of the carb (secured with one big scew), and the inlet needle is on the body of the the metering side under the cover with 4 smaller screws.

I see the "two sided" plug burn on many stihl models, particularly on the 361.

my 2c - Unless you know how the saw is used, "Rich looking" can be very misleading. Idle time and low power cuts blackens very quickly.

 

[PES+]

Late night last night

Yes Lakeside you are correct that the screen is on the pump side of the carb....I was up late with vehicle problems and do not know what I was thinking...had trouble shifting mental gears last night.

The two sided burn pattern is common in high dome combustion chambers but that plug looked extreme.

 

[PES+]

It is a mystery

I have removed a post from this thread and will let the real experts help solve this problem.