Hello my name is Arthur Pratt from Napavine, Wa.. Been looking to make my bike into a motorized bike for some time now. First was looking at e motors but they are only good for 20 miles, well I know that is only in ideal setup, well I am far from that. I weigh #240 and we have hills here! So been looking for a 4-stroke belt or chain driven motor. So far all I found is a 35cc Robin/Sugaru mini-4, ouch pricey!!! Are there any other 4-stroke motors that is belt/chain driven?? But for the price difference I just may go with a 2-stroke! Also can a person put a different muffler on the motors so to make it quieter? 70 decible is not what I call quiet!! Would like the noise level to be close to 40 decible. Well thanks for any info you guys can part with.