My Speedfight 2 100 has a habit of bogging down when the throttle is opened just after it has been started from cold. Usual morning routine is fire it up (starts straight away), start to open the throttle, get to say 1/4 turn, and it dies away, close the throttle and she idles happily, repeat for a minute or two, and then it finally decides that it will allow me to open her up, and she's fine from then on. Any ideas? I thought may be fuel starvation or a clogged fuel filter, but why would it clear itself after a couple of minutes? Very puzzled!

Doug, March 2010

The auto choke may not be working or not working very well it may be worth checking the choke jet is ok and not blocked ,its just cold mate.the black plastic case of the auto choke should get warm when the bike has ben running for a few minutes have a feel of it and see if it gets warm or not.

adam bike doctor, March 2010