Hi and welcome to FixYa,
Initially, your description of "...
off and on it shows me it has the power it should..." is significant as it indicates that it would not be a mechanical / engine problem.
Offhand, almost always, erratic performance and/or intermittent power could be: 1) electrical (
least likely), 2) air/fuel mix (
likely) and/or 3) carb (
most likely).
Interesting though if as you posted, the bike has "...
new...
carbs...". If it were so, then a possibility to consider is that the carbs need synchronization.
Preliminary checks:
- at cold start, determine which cylinders heat up faster / slower using water spray;
- determine the colors of the burns / tips of the sparkplugs at what cylinder;
- loosen the drain screws of each carb and collect the fuel from the drain hose. Compare the quantity and quality amongst all 4 bowls.
Incidentally, is everything stock or aftermarket items installed such as free/open breathers air filters and/or exhaust system?
Good luck and thank you for asking FixYa.
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