WHAT'S THE DIFFERENCE BETWEEN...

[fatboyslim]

Stand-up and Laydown motor brushes??

Last time I bought brushes there was only one type!!

[Old Busted Hotness]

Only the shape of the cutout at the comm end. Most stock motors take laydowns, while mod motors use standups. A laydown brush sits with the wide side facing the endbell, while standups have the narrow side facing it. So the one won't fit in a motor designed for the other (unless you have a brush cutter).

[DJTheo]

Laydown brushes are higher and thus have earlier contact with the next coming commutator section, giving more advanced timing, thus used in stock motors which have fixed endbell timing to give them an advantage.

Cheers