look around,
maybe introduce yourself to the people you want help from
read all you can here
the 4stroke kits are still in the adolescent stage, and there isn't, unfortunately, a lot to choose from
JMO, ya might want to consider a 4-stroke ROBIN or HONDA "weedwhacker-type" engine. friction drive, GEBE-style or gear chain installation. they're all good systems.
look around,
maybe introduce yourself to the people you want help from
read all you can here
the 4stroke kits are still in the adolescent stage, and there isn't, unfortunately, a lot to choose from