Causes and cures of this motor killer
Heat is a paramotor's mortal enemy. Worst cases have the piston
welding itself to the cylinder wall in the mother of all motor failures:
a seizure. A close cousin is the piston burning a hole through it's top.
Molten material drops harmfully into the engine's lower, and most
There are a number of reasons why heat gets to this point. Here are
most, starting with the most common.
1. Mixture is too lean: on carb adjustment. On floatbowl carbs this
can be caused by having too small a jet.
2. Mixture too lean: Too much oil. At some point, oil replaces fuel
and therefore the mixture goes up.
3. Mixture too lean: Air leak inside crankcase or cylinder. It can
come from the cylinder, carburetor attachment, bearings, or exhaust.
4. Low RPM due to oversized or overpitched prop.
5. Blockage in fan (if equipped).
6. Piston ring sticking