hi,500 smokers,1 ride a 76 gt500a,regd.only 34,000 klms,but is smokin real bad,out mostly of the rh pipe.prev owned a 68 ex police cobra,72 water bus new,t500 74 new, plus most suzuki 2 strokes,most yamaha model 2 strokes,raced in b grade rr,flat track,and mx. can tune em as well. best wishes steve d.