hi name is bryce and just built my first bike. its a grubee 66cc on the last bit of the break in tank. but after maybe the first 20 miles the chain broke and tore up a few teeth on the standard 44t. so got a new heavy duty 415 chain and a 48t sprocket. broke in the chain today took a wile but it works great but seems to run slower with the 48t sprocket. is this sprocket going to be to much on the new engine.