privatepile

Get a picture up! Your fault almost certainly lies in the fuel system. You can try adding fuel treatments like Seafoam or Wynn’s , but In my experience it’ll do very little good. Your tank probably needs emptied and flushed out. The carbs need stripped and cleaned, and a new fuel filter added. While the tank is off it’s probably best to check / fit new plugs and air filter. Get the carbs balanced too. Ive got a 93 FP that exhibited similar problems to yours. I’m no expert but found stripping the carbs fairly straightforward and transformed the running of the bike