Beware my friend ......you are getting bad advise .A 56 is too much for an LT 40....Too much cost,too much weight,too much power...you are trying to learn to fly and you will make mistakes.4 strokes are prone to a lot more damage in crashes,due to the parts that stick out from the cylinder,and they are rather fragile....
However I get the feeling you have talked yourself into the larger 4 stroke so good luck......and I rest my case and opinion.