I had to remove the gear cover and clean out my gears plus remove my undertray after every heat and main to clear out the bits of sand to reduce the chances of stuff getting between the gears.
The foam idea is pretty good idea too. I'll give it a go. I wish Schumacher would make an option part for dirt applications. In the short time that i have been running this car, i already had to change out a spur gear. Luck of the draw i guess...
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