i have just bought 2 brand new mini dirt bikes 50cc and asebled them etc... and in the manual were it says first start, it say to protect the engine from damage keep the accelerograph half way.
lol..... i really wouldnt pay that manual no mind, im sure people do not hold the "accelerator" down 1/2 way everytime they start the thing. Just like older cars that say to let it warrm up for 10 minutes before you drive them, nobody does it and they never break down? crank it, rev it, and ride it