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Early 70’s CB250

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billy192:
yes its a G5 but as Bryan said change the oil reguly and clean the funny filter and it will run and run. i have done many K on mine with happy smile.

I think the front wheel is not the correct one and as alway high bars from USA. David silver has loads of new spares for these.

Billy

AshimotoK0:
I think the front wheel is correct and its a G model not a G5. I bought a 350G front drum brake plate from the States for one of my CB250K0's and it had the 369 part number printed inside ..the only difference between it and the earlier K series was a little arrow cast into it for the brake wear indicator

Andych:
Thanks for the info.. with no background on it and no VIN tag stating the age of the bike it is a bit hard to properly identify it.. I will trey through the Motor Registry at some stage and see if they have any info..
For now it will go into hibernation next to the CB400 while I finish the little Yamaha SRX 250 / 350 hybrid.. hopefully not too long though, both the 400 and the 250 are longing for some loving...:)

Andych:
I had the chance today to have a look at the engine parts that came with the bike.. the bottom end turns over ok with no resistance so it will have some oil tipped in and covered up for now.
I really wanted to have a look at the head and valve cover to see how bad it may be... hmmmm.

While everything is pretty grubby and gritty form being in an open shed in the NSW Country (worst drought on record right now) the camshaft is in a bad way.. the bearing surfaces are not too bad (will need to check dimensions and clearances) but the lobes are in a bad way.. as are the rocker arms.. I am not sure how the back of the lobe gets to be so discoloured.. almost look likee its from heat and the tops of the lobes are quite worn and pitted.. so this camshaft will need to be reworked (welded up and re-ground) as will the rocker arms.

I will pay particular attention to the oil pump when I get to that stage and also the cam tensioner.. I see this engine uses a very similar system to the CB400.. does the cam chain tensioner arm suffer similar issues to the CB400 item?
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Bryanj:
Thats the start of an oil starvation problem

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