The Lehner 1930 is a small powerful motor and a good choice for a very light wheight buggy with conservative gearing. On our austrian forum a user tried his XT8 truggy with his Lehner 1930 which he primarely used to power his Mugen MBX5R. On loose surfaces he never faced temperature issues and had plenty of power even in a truggy:
see video and
picture of Lehner 1930 mounted.
On high grip surfaces and more throttle use the Lehner 1930 run hot: see eagletree
graph 1,
graph 2 (temp b represents motor temperature in degrees Celsius)
No wonder when you think about its very small mass. I personaly used a Neu1512 powering my buggy and it is was a perfect fit. It also powered my truggy for quite some time but did run hotter than a Neu 1515.
One thing you have to be very careful about when using Lehners optional fan cooled motors is to protect the motor from dust, stones which could be sucked into the motor. There is only a very small gap between rotor and windings. Some pictures of a Lehner 1950 prepared for offroad use by one of our german forum user (PlanBFidelity): shielding
pic 1,
pic 2