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Offline SDB777

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Top of piston has....
« on: September 05, 2015, 11:01:24 am »
A LOT of black-ish looking crud on top of the piston inside my Stihl 064, but the side of the piston is still looking really good(pulled muffler) - could use some new rings shortly.

Question:  Is there a way to remove the 'crud' without taking the top end off or having the crud ruin the cylinder wall?


Scott
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Offline RoyM

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Re: Top of piston has....
« Reply #1 on: September 05, 2015, 11:55:22 am »
What oil are you using and at what mix ratio? I suggest 40:1, I run mine at 50:1 but don't want to start any arguments, and run 'er hard to get it up to proper operating temperature.
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Offline SDB777

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Re: Top of piston has....
« Reply #2 on: September 05, 2015, 07:59:41 pm »
Quote from: RoyM on September 05, 2015, 11:55:22 am
What oil are you using and at what mix ratio? I suggest 40:1, I run mine at 50:1 but don't want to start any arguments, and run 'er hard to get it up to proper operating temperature.

I've run 35:1 while milling....and I know it has been run hard, probably more then warm.  The crud is still on top of the piston.



Scott (no sleep for a few) B
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Offline mdavlee .

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Re: Top of piston has....
« Reply #3 on: September 05, 2015, 09:08:01 pm »
Stihl used to have a hook to scrape carbon off. My grandpa has one in his 028 case.
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Offline farmboy

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Re: Top of piston has....
« Reply #4 on: September 05, 2015, 09:33:01 pm »
Stihl has decarboning solution.  CRC too.  I justpull the cyl. and clean.
Shep
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Offline JohnG28

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Re: Top of piston has....
« Reply #5 on: September 06, 2015, 10:01:44 pm »
Pull the cylinder to clean it up and throw in the new rings while you're at it.  ;)
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Offline jeff.lary

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Re: Top of piston has....
« Reply #6 on: September 07, 2015, 06:07:41 pm »
Yes I agree with the above if you want to put in a new set of rings well....there is no time like the present. Pull the top clean off the crud change the rings check the squish while you're in there too.
  I have taken my pistons out and put them on my 6" wire wheel to get the hardest stuff off with no ill effects at all. They claim loose carbon or fixed for that matter can do it's own damage to the cylinder if left un-checked. Good luck
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Offline Cut4fun .

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Re: Top of piston has....
« Reply #7 on: September 07, 2015, 07:11:40 pm »
Yep I have seen a few saws with carbon scoring. Looks bad but still ran fine and piston cylinder was fine. Usually cleans right up.
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Offline Al Smith

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Re: Top of piston has....
« Reply #8 on: September 07, 2015, 08:39:51 pm »
It isn'really the oil mix ratio more so it's set a tad rich  wth a restricted exhaust .

Take for example the old outboard boat motors .If you ran at trooling speeds for extended periods they would carbon up .Simple fix,lean them out and run the snot out of them .Richen up so they would run at trooling speeds and go catch walleye--or at least try . ;)
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Offline joe_indi

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Re: Top of piston has....
« Reply #9 on: September 08, 2015, 11:51:17 am »
If you dont mind some 'Witch Doctor' treatment  mix coconut oil with your 2 stroke oil 1:1. Use this mix for a couple of tankfuls at 25:1 once in a way. The coconut oil will gradually get rid of the crud, very slowly.
Right now I am adding Pidilite's Cyclo Motor flush at 1:1 with coconut oil.
I add 5% of this mix with the fuel(2 stroke oil as usual)
The motor flush and coconut oil mix cleans up everything in its path right from the fuel tank onwards.
I have been using this for more than two years on the saws that come in for service.
Only good things have happened so far.
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