Started by old2stroke, December 03, 2015, 04:14:12 PM
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QuoteOil and oil-gas mixing. Use of low quality oil and too much guesstimating (or bad math) about the amount of oil to add to a container of gas and the amount of gas in the container not known accurately. IMHO a mix ratio of 50:1 is a little scary.
Quote from: Spike60 on December 04, 2015, 10:59:23 AMMost common cause is operator error. By a large margin.You guys should see the stuff that comes in here. Most of you know how to take care of a saw. But the typical saw owner.............
Quote from: old2stroke on December 04, 2015, 04:05:14 PMI personally do not go any leaner on the oil mix than 35:1 and I use the best synthetic 2-stroke oils meant for race dirt bikes and snowmobiles and I mix the volumes VERY accurately.
Quote from: old2stroke on December 03, 2015, 04:14:12 PM1. Running too lean an air-fuel mix on the main jet.Sustained operation hyper-lean will melt piston.2. Over heating issues. Consistently lugging the engine down under full power. Low engine speed means the flywheel fan pushes less air through the cylinder fins. Keeping the rpm up maximizes the air flow for best cooling. Wouldn't hurt to take the covers off and blow the crud out of the fins now and again.Big thing here is regularly cleaning crud blocking airflow, and cleaning fins. Oil and sawdust=bad juju.3. Oil and oil-gas mixing. Use of low quality oil and too much guesstimating (or bad math) about the amount of oil to add to a container of gas and the amount of gas in the container not known accurately. IMHO a mix ratio of 50:1 is a little scary. Yeah, I know, less oil - more power, a myth fully endorsed by your local repair shop.Straight-gassing leads to sudden-death, the rest can take much longer.4. Excessive carbon build up in the cylinder head and on the top of the piston. Causes higher compression and hot spots leading to destructive detonation.Won't happen if you exercise the engine regularly, and avoid excess fuel/oil. Main prob: starting fires. If engine gets normal (ab)use, those deposits won't last long, nor will they accumulate. Excessive oil reduces overall octane rating.
Quote from: CR888 on December 22, 2015, 06:26:46 AMPlug fouling is more of a tuning issue than mix ratio issue. Not many can ride a RM400 hard enough to keep plugs looking good. It takes kahoonas and good skill to ride them the way they are intended to run. A RM250 might have been a better choice but l get we don't always get what we want or need. I reckon failing to read and comprehend a saw's manual kills most saws. It's the basics that usually get over looked.
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