So I was finally able to get the bike running after cleaning the carbs 3 times.. Now it seems to be backfiring through the exhaust! Fire is also coming out the exhaust pipe when I pull the throttle back with load popping.. I pulled the spark plugs and found the right side was wet with black oil. cleaned and re-gaped the spark plugs.. still popping and backfiring with flames. Pulled the plugs out again no oil. I am pretty stumped on what to do at this point. I've even tried messing with the needle valves but to no luck. any help would be appreciated!