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Remove the thermostat and test it in heating water. It should begin opening around 65°C (149°F). 5. Tips for Finding a Reliable Service Manual
| Measurement | Standard (New) | Service Limit | | --- | --- | --- | | Piston OD (measured 10mm from skirt bottom) | 59.985 - 59.995 mm | 59.85 mm | | Cylinder ID (measured at 3 positions: top, mid, bottom) | 60.000 - 60.012 mm | 60.10 mm | | Piston-to-cylinder clearance | 0.005 - 0.027 mm | 0.12 mm |
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Carbon buildup from two-stroke oil can jam the valves, causing a massive loss of top-end power.