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StankBooty Liked a reply to forum topic Advice needed on crank bearing seats
1/11/2026 1:26pm
Try warming up the case halves around the main bearings with a heat gun and an IR thermometer to get it up to 200~220 F to simulate running conditions (i.e., specifically get to those temps and don't overshoot it by going hotter) and see if you can spin the outer races within the cases and/or easily lift them out. If they stay in place, and if you were relatively even all the way around with the light sanding you did to the aluminum like you mentioned in your last post, I'd be confident that the main bores are still plenty...
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upbasher Added a reply to Advice needed on crank bearing seats
1/10/2026 4:15pm The whole bore with 1500 grit. There was scoring most of the way around
upbasher Added a reply to Advice needed on crank bearing seats
1/10/2026 3:05pm Lol. Definitely won't be for sale. Im in way too deep in this thing at this point to not make it perfect. I really can't find anything anywhere on the net about whether or not a little light sanding is enough to make a crank bearing spin. If it is I'll just buy new cases and do it again. If...
sandman768 Liked a reply to forum topic Advice needed on crank bearing seats
1/10/2026 3:02pm
For sale: just rebuilt…going in different directions…
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upbasher Started a new thread Advice needed on crank bearing seats
1/10/2026 12:24pm So I am doing a complete build/rebuild on my 23 yz250x and may or may not have made what I would call a noob mistake. When I went to install the new crank bearings, I did not heat up the cases enough and ended up having to tap the bearings in. No big deal I thought, it happens, continued with...
This forum thread has 10 replies.