I just received my new four stroke kit from gasbike.net. This is the one on sale for $199. The engine appears to be a Honda clone. The chain reduction unit has a free wheel on the output sprocket so even if the chain broke and jammed it wouldn't lock the rear wheel. The reduction chain is a duplex chain which looks plenty strong for the engine's output. The only problem I see is the width of the engine and gear box is 10 1/2". I've ordered a wide one piece crank set for my Schwinn Point Beach cruiser and hope it's wide enough. If it isn't I can cut the crank and weld an extension on it to make it wide enough. I'm eager to get this four stroke rig going to compare it with the two stroke conversion I made on my old Schwinn mountain bike last month. So far I've only put 100 miles on the converted bike but it's been running great with no problems at all. Not even a loose screw or bolt so far.