The Leopard 4082 could be considered as close to a 1521 your going to get with that manufacturer. Size wise. A 4274 is probably a better choice. Tenshock makes a much closer equivelent but trying to get details out of the HK company are difficult unless you contact the european distributor. At least they respond within a couple days. But the cost from euro makes it prohibative. You get a better deal stateside by simply buying the CC/Neu 1520. As much power as the 1521, its a 1Y and its a known motor.
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