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The LSJ, LE5, and L61 will all "bolt" and "fit" into each other motors.....but the L61 & LE5 are five ribbed pulleys, while the LSJ is 6 ribbed. Also the ribs on the LSJ are slightly over more than the LE5 & L61 pulley groove. I'm unsure if this would be enough to start eating belts or not. I have not tried running an LSJ in my L61 "yet."