Lately I have had problems starting my 1987 cbr 600f. When it would eventually start it would smoke white and greyish for about 4 minutes or until I opened it up at about 4000rpm. Now it wont start at all, it will turn and I have tried to bump it but to no avail. It is an old bike and it has a lot of miles but it would be good to get it started if at all possible.
Cheers...........

 

stupid question but are you sure you are getting fuel to the carbs. is the smoak really thick and white? mabey you have to much oil in the bike have you checked it recently? thoose are my only thoughts but they might not even help