I am tired of rebuilding my carbs can anyone recommend what fuel i should use to stop this
If your bike is sitting a lot, add Stabil to keep it from gumming.
and what fuel was recommended from the factory in 1976
Doesn't matter. You can't get what was available in 1976, today.
If you are asking for octane rating, it matters what country you are in. Different countries use different rating systems. But, if the engine is in stock configuration, regular or the lowest gasoline grade will work fine.
Cheers,
