stick to the savage K4.6 i had a hyper 7 before, and now run a hyper st rtr. i went through 2 macstar .28 engines. they need tuning top end and low end everytime you start it.
i also found that the heat sink/head kept coming loose and loosing compression. once the head heated up i would need to nip the bolts tight all the time. its such a poor engine.

i now run a k4.6 on my ST and its brilliant. it wipes the floor with anything around it. even buggys.


phil.