Hi Guys
I have a NSR MC21 i build it my self but i have a problem with starting the bike
If the bike is cold it wont start but if i spray in the curbs starts and runs ok but if it cools down wont start, i clean the curbs a check the reeds
for cracks the look ok, can anybody give me some help or guide me to find the problem i have 2 sets of curbs but is the same with both

I hope someone can help

Thanks