I want to use this HF 90cc engine . What are the recommendations for drive kits? I like the engine because it's cheap 4-stroke, and I'm settled on 4-stroke. I would suppose a friction drive (FD) would be the easiest, but I'm open to other arrangements. I believe this 99 cc and the 80 cc versions differ only in bore, and I may use either. I haven't bought either yet. I'd like a specific recommendation of a kit that's already been used to mount this engine.