I taught my 2 year old grandsom how to ride a tricycle today---------next week how to weld, and then we are going to put a full roller, pratt-whitney 985 radial engine with 6 blade prop on it-its one of those plastic Harley Davidson trikes with a liftable seat with a storage area under it-----genuine full roller plastic wheels with those fancy snap on cap retainers. He's only 2 years old now but will be 3 by the end of June 2016, and he fully understands how to use a 3/8 reversable rachet wrench. The engine is a crate engine from a salvage yard and comes with everything except the spark plugs-there are 2 per cylinder and altho they cost over $70 per plug, I think we can run it on just one per cylinder with one of those red plastic plugs in the other hole. I'll try to post an U tube vid of it as soon as the weather warms up and we can get it outside