I recently acquired an old OS FS 90 Model 1901 engine from an estate sale. I'd like to rebuild it, new bearings, etc. but don't know a good source for parts (or if it's even going to be worth it). Can anyone recommend a source for parts or maybe even someone to take a look at the engine?

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Thanks!

Boca http://www.bocabearings.com/ has your bearing then the rest has to be purchase probably from OS. I recall that the early 4 cycles like your did not have enough power to be usefull until OS came out with surpass series. I would probaby sell the engine on ebay to engine collectors and forward the proceedings from the sale toward the down payment for a new engine such as a saito.

Think that old girl has the push rods in back so it is kind of hard to check the bearings. Think I would flush it with some Alcohol & run it. Then worry about fixing it . They were not a bad one, just use it in some thing big & slow. They pull a pretty good prop.
>>>>>>>>>>>>>>big max 1935>>>>>>>>>>>>>>>>>>>>

Don't let these guys fool you. That is a WONDERFUL engine!

I had one on an old Goldberg clipped wing cub...lots of fun! Good engine, but use a low pitched prop, couldn't get mine to idle lower than 3000rpm. The cub would just keep on flying at that rpm with a 14x6!