Curvy revs drop

[allantheboss]

The bike will start, and will stay on for a while, but after about 20-30 seconds, the revs will start dropping until it cuts out, even with the choke on.

So the bike wont keep going unless I repeatedly twist the throttle, with the choke on. If the choke is off, the revs are too low (if I dont throttle) and the bike cuts out anyway (I assume this is because of how cold it it)

[Alpinestarhero]

does sound like carb icing is occuringm- How much fuel is in the tank? you may like to try adding some silkolene pro FST

[Wideboy]

or something is up with your plumbing, like your floats arnt filling up properly and getting a constant feed.... but you should get more than 20 secs running time