I have 2005 BN125. Starts fine when cold (a little cold-blooded, needs to be choked, but nbd), runs great. After I ride it a while (15-20 minutes), shut it off, then it won't start again. No click, no crank, nothing. It's like the switch is off. After it cools off it starts again. All I've done at this point is replace the battery, but from the look of the vent hose it needed it anyway. I've not talked to anyone else who's had this issue. Is there a heat-sensor somewhere I'm missing?