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You could lift the wheel off the ground and spin listening for a grinding noise. I'd get new bearings and make a decision after you take the current ones out and made a visual inspection. You could even compare how they spin in your hand. If they are still good, you will just have bearings in stock for when they do go bad. The hardest part to replacing the bearings IMO is taking out the big outer race. A bead of weld on the inner circumference of the race makes tapping it out nearly effortless.
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Michel Garcia - 1986 240 B230F & 1982 240 B21A - Ottawa, Canada
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