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.