As people have already said in this thread, There is a different technique to starting a fourstroke mx bike. It may just be your kicking it too hard, I've little expericence with the Honda 250f, however I have had my fair share of it's big brother,the 450f. I found that a slow kick with very little force, but though the full stroke of the kick start will bring an easier engine start than a furious small kick of half travel or less.
From experience this usally is the case when a mid-race mistake has been made and panic sets in, your sooo keen to get back into the race the technique goes out of the window. I myself have lost a lap attempting to re-start a hot 450f with poor technique
Good luck and remember to visit RacersEdge forum friends
www.futureracingmotocross.co.uk for great price on parts and accessories.
Also, I hear Goldentyres are a great choice for MX sucess
