i have a 1991 indy 500. the mods are xtra 10 front and rear. sks track. 144 stuts. slp skis. 8 inch carbides. clutch kit from hot seat. decker pipes. new jetting. low cut wind shield. lower gearing. tunnel protectors. hood screen kit. new handlebars with grips. skid plate. k&n air filters.
1976 MERC ICE TWISTER, 340, piped
1975 KITTY CAT
1983 CROSS COUNTRY, 500cc piped, clutched
1998 XC700 RMK, piped, clutched
1998 XCF440
may not able to fix stupid, but you can modify it.