I have been using this forum like the library for a while and now I need to make my contributions. I have a cruiser style bicycle made by specialized that I have had motorized for about a year now. Chinese engine kit. My mods have been done over this past year. They are: 8mm spiral core Accel spark plug wire. Champion e3 plug notched and beveled piston. cleaned out all casting fins on intake and transfers exhaust header is electrical conduit blowing into a pipe made for a moped that I got on Ebay with shipping for $33.00 Run premium octane with a special blend of G-oil, Castor oil ,marvel oil, and thulene, naptha, xylene. laid back seat post roller bearing chain tensioner. Gas cap is a GM power steering pump cap. Still run stock gear ratio of 44-10. Rear wheel is a freewheel with 11 guage spokes. Changed my tubes to slime tubes and haven't had a flat since. No speedo, I lost it months ago, But I have no problems with traffic.