1984 Z1300, carby model. Both my bikes were taken of the road when my daughter was born 6 years ago. The Z1300 in particular was stored right, oil down the pots, batery removed, bike elevated ect. Except for no starter motor it was still very tight and running perfect. Now it has a new starter and preped to run, It took some coaxing to fire after years of storage but fire she did. After a 15minutes of extremely rough running, it soon smoothed out to a purr and then I nailed it hard. Forget about no rear shocks (blown seals) as the arse end lowered, the bike screamed like the day I bought it. Put the bike away for the day and when starting the next day, ran fine then started missing all of a sudden like a blocked jet i thought. Had carbys off about dozen times so far and there is no blockage in jets, needle/seats are fine and adjusted. On about the 7th time of removeing carbys/cleaning and re-installing I decided to take it for a decent run. The whole 3 hour run it was missing quite seriously then 2 minutes from home it smoothed out perfectly again. Laid some black marks around celebrateing and shut it down after a cool down. Next day, fired up and was missing again. Has new plugs, oil and fuel cock has beenremoved/cleaned, new fuel filter and fuel lines and carbys cleaned. Coils are suspicious though i think it would never have run hard if they were stuffed. Number 4 out of 6 cylinders is fouling the plug while number 3 shareing the same carby dosn't foul as bad. Hmmmm, maybe leads? The bike back fires like it's running lean and the last ride seen the fuel filter emptying so as the bike stopped. Sit beside the road for a minute and let the brand new fuel filter fill back up and off it goes with the usual miss/lean sound. Stops back fireing when warmed up. Any ideas or help appreciated.