Thank you for your question! The ECHO 2-stroke engines require a 50:1 ratio.
ECHO X Series, Gas-Powered Backpack Blower with Tube Throttle, 756CFM 234MPH 33N, Engine Displacement 63.3 cc,Model# PB-770T

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- 63.3cc professional-grade, 2-stroke engine for outstanding performance and durability
- 756 CFM, 234 MPH and 33 N of blowing performance increases productivity
- Side-mounted, heavy-duty, dual-stage air filtration increases engine life
- Exclusive vented back pad provides cooling air that circulates around the user for comfort in hot weather
- Variable-speed, tube-mounted throttle with cruise control offers operator convenience
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