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Cb250k3 first restoration project

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Fenderfreak:
Bought a CB250K3 which though Mot’d and running was a bit of a dog and showed it’s age. Mileage? Anyone’s guess as Mot s showed anything from 34,000 to 8,500 and back up 🤔. Visible problems, crappy paint, hand painted frames, dented and rusted chrome. Starter motor removed!

Rode home but pretty gutless,  checked compression down from 170psi to 90psi. Squirted some oil down the bores no change in compression so probably valves, last owner did say he had just done some work on the valves.

Any way now all stripped down and intend to do a complete restoration. wish me luck 😀

Bryanj:
Back in the day was common for these to shatter rings if thrashed from cold, no matter how new or old they were

Fenderfreak:
better get ready to catch some bits when I take the barrels off then 😉

AshimotoK0:
Biggest problem is cam/followers/end bearing ..notorious for pitting/scoring/wear. Getting harder and harder to find decent ones, even though around a million of that K model sold in various guises. Mainly down to lack of oil changing of course and the Americans seem worse than us for that, so even  low mile imports often have trashed top ends. At least your K3 is the 1st to have the '312' style rockers and the 'skinny' cam.... which are slightly easier to find.

philward:
Good luck with the build. I have a soft spot for the K3 as it was my first road bike - New in Sept 71. I had shattered ring thing that Bryan commented on.

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