More info would help. Your controller is probably rated at 35 amps--mine is. Are you using the original battery or have you upgraded? If you've upgraded to LIFEPO4s but didn't get a battery with an adequate maximum continuous discharge rate, the battery's BMS may be shutting down to protect the battery system. (Ping recommends the 24W 30AH battery for most Currie bikes and kits.) That's what happened to a lot of Currie owners who participated in a group buy for LIFEPO4s on another forum several years ago -- the BMS in their batteries is constantly shutting down when they accelerate too fast or the controller demands peak energy. They're one unhappy group.
Did you do any mods, such as converting to 36V? (Prior to 2008, the Currie bikes could be modified to 36V using the factory-supplied controller. However, the mod created issues, too. Cooling mods were developed to try to address the over-heating issues with the motor. Check out this thread--it may also have some specific instructions on removing the motor cover--not hard to do, but you have to be careful not to lose the bearings-- https://endless-sphere.com/forums/vi...3249&start=105
It could also be a controller or throttle issue. If you have a volt meter, you might check out the controller and throttle. You might also post your questions in this forum, it seems to have more Currie bike owners -- http://www.ecoforumz.com/electric-bicycle-scooter/
Last edited by nwmtnbkr; 09-25-09 at 10:18 AM.