tm suzuki kickback

[Nipper]

my 1973 tm 250 Suzuki tends to have a habit of kicking back just prior to starting. if I give it a good kick and it wont fire invariably it will kick back.
Does anyone know what the likely problem might be and how to fix it.
Cheers Nipper.

[ninjamk]

Mine was doing the same thing a bit at the ice race last weekend.  Never has done it before so I was thinking it was the temperature, about 10F.  My best guess would be either fuel or timing.  I never bothered checking since it ran like a top once started.

[Ken 737]

Mine does that too occasionally, probably when I don't kick hard enough or follow through. Always starts straight after and runs fine.
Ken

[Nipper]

Once the bike is running it runs just fine , I was thinking that it might have been in the timing of the motor, but wasn't sure.