It's so annoying when I was riding a section today it stalled twice or should I say I stalled it twice but couldn't re start it and carry on I had to push it away prop it against a tree and kick it over it took 4 or 5 attempts sometimes more not good really,I think I,ll speak to birketts and see if they can help or supply the kit . Apart from that the bike is superb nags of power but very smooth ??