One trick is too use a 100W droplight bulb to warm up the race,leave it sitting on the bulb for 15 minutes and use a glove to handle it..it will expand the bearing several thousandths and let it slip on easily..
I learned that from a Bower/BCA factory "helpline" tech one day,after I sold two bearings to a customer who was repairing a large oil delivery truck--I had sent hime one bearings (by matching the numbers off the old one),and he calls me back ten minutes later and says "I dont know WTF is wrong with this bearingmits just TOO SMALL to fit over the threads on the axle,and I dont want to booger them up trying to force it over them--the old bearing slides right on!--this one must be undesized or something"...so I sent another one,and again,same dilema...
Out of suggestions,I told him I'd call the BCA "helpline" and see what they said..
When I called him back and told him what to do,with the light bulb,he said "phhhhfftt--what an assenine answer!--YA,RIGHT,that'll work!.

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"Oh well what the hell,I got nothing to lose!"..
About 20 minutes later he calls back--said "Hey,I cant believe it,but it WORKED!..that bearing looked to be .010 smaller than the old one--but after I heated it up,it slid right on!..they were right!..

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I've warmed some tapered bearings for a small engine up on my wood stove before,and they slide right on,you just have to be careful not to get them TOO hot..if I hadn't done that,they would need to be pressed on at a machine shop..$$$$..I put the crankshaft outside in a snowbank to shrink it some too,and it worked slick...