it would be nice to see some smoke blow coming from this new engine whilst running in also make sure theres heaps of oil splatter coming from the pipe outlet. keep you fuel mixture at 20% oil plus its good to use an oil mix of 50 - 50 meaning half synthetic and half castor. a couple of slight mods you should do to the great Boomerang trainer is fit larger diameter wheels , replace the rear undercarriage with a Dubro fibreglass type and glue in a support block inside the fuselage to where the steering cable outer tube runs from bulkhead number 2 to the rudder servo, the distance between these 2 points causes too much slop in the cable which makes taxi steering with the front wheel more difficult, the block wedge provides great support.