trinyquist

Was about to go for a ride, got about half a mile up the road and I noticed the bike wasn't pulling properly, a distinct lack of power compared to what it should be. I pulled over (my dad was following me on his bike, so pulled over as well) and the fuel light was on, so I thought I might have been running low on fuel. My dad rode back home, brought some petrol with him and we filled the bike up.

Tried starting the bike and it was not firing up correctly, sort of stuttering and wouldnt idle, would just die. We noticed the front cylinder wasn't firing, so we checked the front spark plug, which still works. We've run out of ideas as to why it doesnt want to fire. Anyone else had this problem?

Just now I've noticed that the front cylinder doesn't want to fire until the bike is revved over around 4000rpm.

Any help would be appreciated!

Cheers