So now..
a stock ungeared engine then, good..
so if the clutch isn't engaging, it's a matter of rpms.
14T are actually more in the realms of race clutches and I hope you didn't buy a 20 dollar version of it
those are actually 100% useless..
your gear ratio needs to be -as said- in the 6:1 realms for small (13" or smaller) wheels.
frankly looking at the sprocket I think you are more likely to have 18-20" wheels attached, no?
and with that we talk somewhere between a 8:1-10:1 ratio likely
with 14T on the clutch that means you need up to 140 teeth on the axle..
not going to happen, is it?
Anyways, uselessness..
cheap clutches are going to burn out much faster than high quality ones,
and with an absurd number of teeth you are more likely to gear too high for the kart,
since as said, if you need 140T on the axle you will most likely fail to get a big enough sprocket.
and too high gearing wears down a cheap clutch in no time at all.
Also: high toothcount race clutches are more likely to engage later than ~2k rpms
and with that -as I mentioned above- you MUST remove the governor to even get a high enough rpm at times.
Ah well, post some infos and we might be able to give you some more tips.
(kart and rider weight, wheelsize, jackshaft or no etc...)
'sid