Using the correct flywheel grinding stone will speed the flywheel grinding process and produce better results.
To determine what material your flywheel is made of (hardness), “spark test” a flywheel before grinding it. Using whatever grinding stone is on the machine, briefly touch it to the flywheel and watch the sparks.
- Cast Iron (soft) flywheels make deep orange sparks that travel only a short distance before burning up.
- Cast Steel (medium) flywheels make light orange to golden sparks that travel farther before burning up.
- Billet Steel (very hard) flywheels make bright yellow-white sparks that travel very far before burning up.
For most cast iron flywheels, we recommend a general-purpose stone that is made of silicon carbide (generally dark gray or black in color). For harder flywheels like steel, we recommend using a stone that is made of aluminum oxide (generally white or ruby in color).
FGW-57 | 6" Grinding Wheel for Cast Iron
$61.99
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6" CBN Flywheel Stone | 2367275
$257.99
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FGW-67 | 6" Grinding Wheel for Cast Iron
$61.99
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