originalhandy wrote: With the tank off the bike and turned to on nothing drains out, when I switch prime it free drains.
This is correct. With the petcock set to ON, try putting a piece of vacuum hose on the petcock vacuum port and drawing a vacuum. Fuel should flow and stop as soon as the vacuum is released
originalhandy wrote: When I put it on the bike on on position petrol just drains out. I presume petcock needs to be rebuilt? Do the carbs need a rebuild too?
Where is the fuel draining out? Of the carbs? If so, your float needles are not working so it's carb rebuild time.
