hi all my bultaco as been sat for a wile since restoring it the petrol as been in the tank for roughly 6 0r 7 months she starts up ok normaly takes a few gose when shes not been run for a wile i had her runing today started up 3thd kick ticking over no probs had a ride round the garden shes dosent seem to be pulling as she did know ive not done anything to her would it be possibel that the petrol as gone stale? hence loss of power