you have to completely rebiuld the carbs. the carbs are sensitive on a 30 yr old bike. old parts just dont do it. i went to www. siriusconinc.com you can call them up too 716-989-0091. the guy is very knowledgeable. he knows his $%it. buy the whole kit, he will tell you want you need. let me know how it works. i redid all the carbs to like-new and runs perfect.