i usually have a winter project or two that i may sell or ride a few years, depending on the bike. have refreshed many cb750s, a cb550, and a few two-strokes. liked my 76 cb750 and also my dt250, kept them both for awhile. sometimes i sell them as a nearly done project, if predicted expenses such as bodywork (done by others) or mufflers (omg pricing) won't be recouped. my 64 ca77, 69 cd175 and 69 cl125a all fell into that territory. i left it up to the next owner to decide their own path -- i.e. race bike, full-on resto, daily rider, or chopped into a cafe'. when researching this bike, i noted it was on this site back in 2012 and you gave some well-thought out and patient advice. with 3930 miles, i had assumed the bottom end would be fine and the internals certainly were super-clean when checked. this project was coming along nicely until i started looking for problems as i am want to do, as i never sell a bike with hidden issues. this bearing problem was a complete surprise.
i looked up the nominal radial play on a 6306 bearing (C3 class) and its roughly .0015, so i need to decide my course of action. luckily a vintage honda mechanic is nearby and he's loaned tools as needed in the past, and helped when i've been stuck. when i was overly cautious and asking for help checking the valves (all 16 of them) on a dual overhead cam cbr600, he pushed me into doing it myself. being the usual tappet/screw type, it was easy (no shims!)
i'll visit him this week, and discuss my next step. maybe i'll split the cases and bring him the crank side? i have a service manual. really too bad, as i just polished all engine mounting bolts, painted the brackets, and re-installed them. all torqued and Loctite'd. a shame really, as everything on this bike is real nice with the exception of locked-up shocks. i think they're over-full, the PO mentioned he rebuilt them. piston was in backwards too, but luckily no damage.
well, i have to mull this over. many thx!
rlp
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