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I currently run a 490 with a muffler mod and base gasket delete and it’s a great ... Log In Sign Up. User account menu. Found the internet! 1. Echo 490 vs 501P. Close. 1. Posted by 1 year ago. Echo 490 vs 501P. I currently run a 490 with a muffler mod and base gasket delete and it’s a great little saw. I’m thinking about upgrading to the. Echo CS-4910 chainsaw. Photo credit: Echo. The new CS-4910 chainsaw replaces Echo’s CS-490. It’s the lightest 50 cc chainsaw on the market and was made to tackle tree felling, limbing, firewood cutting, storm clean up, pruning low. Fuel and oil mixture. Echo recommends adding a 25:1 ratio of fuel to 2-cycle motor oil for your CS-590, while owners of the CS-490 are instructed to use a 50:1 ratio. The fourth difference between these chainsaws is that they're slightly different sizes — the Echo CS-590 weighs 12 pounds, while the smaller Echo CS-490 only weighs 10 pounds.