Jack, Thank you and your staff and especially the little lady. I have been working on my 1973 HK1 4-speed for about 1 1/2 years. 85 cc with one of your 20mm Mikuni carbs. 16 sprocket and a 35 on the rear does well...about 50mph.......call her Little Red. Probably 75 % of this bike is your parts,mostly 77 controls on the handlebars. I've probably ordered from ya 50 times and never had a mistake or problem. Keep up the good work. Happy Trails To All, Dave in Atlanta