Noisy exhaust and lacking in power

[Speed freak]

Hi Guys

I have a NC30 and it runs well most of the time, except this morning. I started my bike and noticed that is does not idle and when I pull away I have to open the throttle much more than usual since it does not produce the same amount of power for some reason. The exhaust is also very noisy at the same time. When I am on the freeway the bike gains speed very slowly. This problem occures sometimes, but it is resolved after I have driven the bike for about 10km, this morning I drove 50km and still it is lacking in power. I have driven the bike 2 days ago without a problem. I think it could be a fuel line problem (tubes, vacuum hose, diaphragm). I am not sure if I should check the spark plugs also. Could it be that the fuel line is the cause of the problem? Your response would be greatly appreciated. Thanx

[force-v4]

Could be a few things,

Fuel tap vac hose?

Spark plugs could be knackered?

Blockage in the carbs?

It should be something quite simple, its a honda.