Stihl 440 -- How much damage here ?

[Bobcat]

A friend showed me some pics of this saw. What should be done ? It had to be running pretty hot so could there also be some seal or bearing damage ? No pic to show, but there was some cylinder damage above the exhaust port. Nothing deep, but several noticeable spots. I do not know the saw history; maybe the rpm's too high ? not enough oil in the gas ? or ? (my first post with pics, & not sure what we are going to get)

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[Lakeside53]

HUH? looks perfectly fine to me... if anything the saw is running rich. the "two colors" on the plug insulator is because of the combustion swirl.

 

[Festus Haggen]

Tell him it's no good, and you'll only charge him 20 bucks to get rid of it.

 

[chainsaw kid]

I do see one problem....it needs a little port work

 

[Bobcat]

Andy: seems like all the pulgs I look at are the same on all sides. I thought the brown side was a sign of ring problem on the exhaust side.

 

[HUSKYMAN]

Brown is good, it means the saw is running properly. White is BAD

 

[Bobcat]

Festus:
That's awful.....a $20 disposal fee.

 

[Lakeside53]

Andy: seems like all the pulgs I look at are the same on all sides. I thought the brown side was a sign of ring problem on the exhaust side.

Nope. Depends on the saw combustion chamber and transfer ports. Check a 361: they will ALL be markedly two colored due to the combustion swirl.

 

[Sprig]

Thanks Lake, my bud and me were looking at the pics trying to see something wrong didn't think we did, you confirmed it



Serge

 

[joesawer]

The spark screen is really clean, And the carbon build up is not heavy on the plug, so I would think it is not to rich. IMO a lot of todays gas will not hardly leave a good tan or brown plug, it is white or black not hardly any in between.

 

[Bobcat]

Andy:
I will take a look at the plug on my 361. Thanks for letting me know the two-color is ok; thought I had a problem starting.

 

[teacherman]

Hazmat disposal fee

Tell him it's no good, and you'll only charge him 20 bucks to get rid of it.

I'd do it for $10. But seriously, I really appreciate all the info I get from the folks here. Learning and having fun at the same time. Bein' a schoolparp by trade (I'm not purty enough to be a schoolmarm), I relate to that in a big way.
Feel free to ask me highly tecnical compooter questions, and you will be very perplexed. I sure am. :greenchainsaw:

 

[wanab]

looks about as rich as any newer saws i have seen.

if it was me the rings look a bit worn but im compulsive about my 2 strokes.

if you did a teardown (2 bucks for base gasket and prolly $15 for rings) you could check the piston better but it looks like it should last another set of rings from what i see.

 

[Lakeside53]

$15 will buy you $3.00 aftermarket rings.. not OEM... and there is a difference... I'd rather have the slightly worn OEM than new aftermarket any day.

If the compression is around 150, leave it alone... and make sure your compression tester is for small engines..

 

[wanab]

well i never bought stihl rings. just thru a # out there. im with Andy and prefer OEM for such a job.

 

[epicklein22]

Nope. Depends on the saw combustion chamber and transfer ports. Check a 361: they will ALL be markedly two colored due to the combustion swirl.

My ms270 plug looks the same way. I was constantly checking it when I did a little muffler mod and it looked the same everytime.

 

[Bobcat]

Thanks for the feed back. As Huskyman said, brown is good, but I thought the plug would be all brown. Lesson learned.

Did everyone see how fast Andy rolled out of bed to clear up things with his....."HUH? looks perfectly fine to me...". Never too early, or too late, for Andy to help. thanks