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There may be some dirt bikes that also may be suitable donors in the 175cc range if re-geared. Forced air and an alcohol/water mist could help cooling. A cylinder head temp gauge is often used to monitor the engine on racing karts. Allow 1 hp for every 36 lbs of gross vehicle weight. Junkyard parts for windshield wiper and ventilation fan. One advantage of a water cooled engine is the ease of installing a heater core for defrost and passenger heat. Chains and belts last a long time if they are kept clean and adjusted.
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