I used the 2x4 method for several years until one day when I was running a new Saito 80,and watched as the screws I had holding the engine backed out and the engine hit the dirt.It did'nt take over five seconds for that to happen.I got the brain equilvelant of dumb thumbs and just watched it instead of chopping power.I've got a fine al. mount now,not sure of brand,that has locking pins to hold the engine there,as long as the hold down bolts stay tight.JMHO.

Bill