I would not recommend this at all. Bearings have a rating system called the ABEC system. Basically a bearing with a higher number (IE 9 ) has much closer tolerances than a bearing with a rating of 1. Which bearing would you rather run in your engine??If you put a lower rated bearing in your engine there is a good chance you will damage the crankshaft to block sealing effect that is super important in our small engines,Also the bearing retainer is pretty important in some engines, for example a steel cage would be fine in an airplane engine that only turns 16k but that same steel cage(retainer) in a car or boatengine could be trouble. Most high quality carand marine bearings will use a nylon or phenolic type retainer because they can turn in excess of 30,000 rpm's. Stainless bearings are not always the better option either as stainless steel is softer than achrome plated bearing, that being said if you stay with qualitystainless bearings you should be fine.