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Is the cold start button on the UR1 series the round pin through the hex but on the left hand side of the pump?
Is so should the nut be free to turn or done up tight?
Cheers
Nut is counternut used for lock of thread under nipple with button. Position of thread affects maximal injected fuel quantity (set from factory). Unthreading increase maximal quantity (more power, more smoke etc...).