Can't is a four letter dirty word
Now your are talkin’ down under QUICK and dirty cheap! Since we have a couple of primary drives around here why don’t we give that the old Texas try!There's very little side thrust on the bearing - the clutch is designed so that all of the spring force is self-contained within the hub, unlike the chain drive Bul clutch and most others. So it really won't take much to retain the bearing at all, a thrust washer behind the basket as Teazer suggested or a sheetmetal retainer ring over the top of the bearing would do it. If you really wanted to get quick-and-dirty (my favorite kind) you could just put a thin ring over the outer race and tack weld it down in 3 or 4 places. You'd have to grind the tacks off to change the bearing - not a big deal - but they last forever anyway.
Incidentally, and as someone who has battled primary drive issues for many years with big Buls, these sorts of problems commonly surface when the rotating mass is reduced and the rpm range raised, they're rarely a problem at all with the stock heavy flywheels. It's not the torque that causes the problems, it's the hammering from the intermittent impulses. So while a lighter rotating assembly certainly has its advantages it does make life difficult for everything downstream of the crank, even with the spring-and-cam drive pinion. Things get hammered and rattle loose.
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