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Saito 150 4 stroke

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Saito 150 4 stroke

Old 05-24-2017, 01:00 PM
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Default Saito 150 4 stroke

Need help! I purchased a Saito 150 four stroke engine last week. It came on a Great Planes Stearman. The engine will start and run from low idle to mid range. When I go to full throttle, it will kick back and quit.
I took the engine off the plane and put it on a test stand. Same thing. Tried different plugs and 2 kinds of fuel. Nothing helps. Has anyone experienced this problem?
Old 05-24-2017, 07:14 PM
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The HSN is set far to lean, turn the HSN CCW by 15 minutes or 1/4 turn minimum.
Old 05-27-2017, 04:49 PM
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Main needle needs to be richer. More fuel required at the top end

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