Couple questions. When I power up my bike (13 wr450) it sounds like the fuel pump cycles. What is it doing? If I remove my battery than what? Is this cycle not necessary? Also how do you use the tuner without the battery in the bike? Without the battery, the pump uses the alternator as a power source, same as on an EFI YZ450, and it may take more than one kick to run up 45 psi so the injector can function properly. The tuner has it's own batteries.