Hobao02626 Roto Start Backplate Hyper (HoBao Engine)

Will this work for a HoBao hyper 7?

Will this start the MAC☆28 that comes on hyper 7.

Will this start a hyper 30 size engine

Will this work on a trakstar 28 ? im installing it on a revo with a big block conversion kit and i've got minimal clearance to access the back of the