Posted by Chris NW Ind on May 16, 2018 at 18:24:25 from (174.221.14.50):
In Reply to: Re: Chain Saw Gas posted by showcrop on May 16, 2018 at 18:08:25:
The 16:1 ratio and the straight weight motor oil for 2 stroke mix are both silly. Both are obsolete standards yet people still advocate it. All 16 to 1 does is create smoke and using 30W (very common for old saws) creates alot of soot in saws. This leads to carboned ports and pistons and can lead to carbon breaking off and scoring skirts. I have lots of old manuals and many recommend decarbing the exhaust ports with a wooden stick. How many poor running motors can be traced back to clogged exhausts?
I've never seen an oil-rich mix plug up carb screens. Varnished fuel, sure. Ethanol is a little sketchy, seems to cause alot of trouble with tygon fuel lines, but rubber holds up better. Main thing here is to avoid old fuel. Dump it in your old tractor if suspect.
Clogged cylinder fins are another source of overheating and scoring. Some Homelites were notorious for this to this point of Homelite detuning the saw and calling it fixed. I'm speaking of the SXL925 and the 540. Wasn't exclusive to Homelite.
Start talking outboards and that's a whole different can of worms.
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