best kit to get

I have been looking around for a reliable kit that is not going to be always breaking down. So what does everyone think about this kit ( http://www.staton-inc.com/store/products/FDR_427_1_1_8_China_made_Mitsubishi_TLE43_clone_with_42_7_cc_1_676_hp_Two_Cycle_Mix_25_to_1_ratio-1843-13.html )? Has...

I'm going to be ordering a 4 stroke engine kit off of Bicycle Engines, Motorized Bicycles, Bicycle Motors, Motored Bikes: 2-Stroke & 4-Stroke Kits! and I want input on both 4 stroke engine kits. What one lasts longer? Less problems? Etc 4G T Belt Drive 4 Stroke Engine Kit 49cc 4G T Belt...