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A fellow firefighter was cutting with his Echo

A fellow firefighter was cutting with his Echo CS-440, it was running great, cutting fine he had completed a few cuts to get the tree on the ground and had run through 2 tanks of fuel. He is using Echos brand 1 gal mix in a 1 gal container. As he was getting ready to start on the trunk the saw locked up. The dealer said he was running too lean and he is SOOL due to not having proper mix, and estimated a non warranty repair of over 300.00. My question is if he was using this saw and had run multiple tanks why would the saw all of the sudden lock up, it is only a year old and has always started and ran fine using the same mix from teh onset. Another question would be is 300 a reasonable price for the repair of an otherwise perfect saw. Would the cylinder be cracked or would it be able to be saved. Just trying to help a fellow firefighter and save him a few bucks, he is well aware of fuel mix ratios in regard t oseveral of our ventilation saws needing different ratios due to age of saw. Thanks for any suggestions and stay safe.

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The cylinder (if engine running too lean) would be badly scored as well as the piston and rings. Knowing today's prices for parts and labor, $300 is probably not too far off. At that price though, he might consider replacing the entire saw rather than repair. I have noticed a number of Echo saws that don't seem to 4-stroke when running at speed, but not cutting. A properly tuned 2-stroke should always 4-stroke at speed, but immediately 2-stroke when cutting--this produces the most power and least heat. The fuel should always be premixed in the can, agitated well during mixing and again before using in the saw. Agitate the saw after adding the new fuel as well. At 50:1 ratios, there isn't much spare lubrication in the engine. He might consider another brand of saw if buying new. Hope some of this helps!

Posted on May 10, 2010


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