hold on a second... I just had an HPI engine that wouldn't run...

the guys at HPI told me to check the exhaust pipe.. where the stinger comes out, they've been getting a bit of flashing in there which is causing pressure to build.. get in to that stinger and make sure it is cleaned out and free... don't be a bonehead like me though and break the stupid pipe...

anyhow, I cleaned that out and my MT2 runs just fine...

I recently got an engine from HPI that I couldn't get to run, I worked with them and then sent it in.. turned out they couldn't get it running either and are sending me a new one.. to this, I don't think less of their engines, things happen, I'm very happy with all of the HPI engines that I do have.. you may want to call/email HPI and see what they can do to help..