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Thread: Replacement engine for an ST 91
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Old 04-01-2026 | 08:08 PM
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Truckracer
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The OS 65 / 75 and 95 AX 2 strokes all fit the same mount as the ST. I've made the swap several times. Sadly though, the mounting holes will not line up. Power wise the OS 75 has about the same power as the ST 90 and the OS 95 will run away and hide from the ST90. Have owned all these engines and liked them all but the OS is stronger.
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