SOHC.co.uk Forums > SOHC Singles & Twins
CB350 1971 Restoration Project
AshimotoK0:
CB250/350K notorious for rotting out bottom front frame tubes particularly when the bike is left with the seat off or open in the rain.
Bring it into work on Tuesday and I can probe it in the areas that I know that they are prone to rotting out.
Yes some sort of wax protection and drain holes are not a bad idea although most classics these days rarely see rain but I know you are going to ride yours ;D
BenPowell:
Hi everyone,
Been a few weeks since I’ve posted an update on the restoration, I got the frame and a few other parts back from painting and it gave me a bit of a needed kick to get on with the bike.
Forks have been stripped, cleaned and rebuilt with news seals and some fresh oil, actually feels like they have some damping effect now so that’s good ;D
Rear shocks were beyond repair, although from the surface they looked good, it turned out the seals were weeping and one of them had a broken plastic sleeve, anyway got a new shiny set now.
One job I really enjoyed doing was lacing up the front wheel, I’ve been putting it off because it’s something I’ve never done, but I watched some videos and had a go and it went really well. Just need to true it up at work on Tuesday, although I had a quick spin and it really isn’t back at all.
One thing I need to ask is what everyone does about buying hex bolts, nuts, washers etc, every time I look there’s always a min quantity of say 50 or 100, is there an online pick and mix type or at least one anyone has used in the past for smaller quantities?
I’ll put some pics below of the progress
Next job, getting engine parts ready for paint
Thanks
taysidedragon:
Frame and parts looking good.
Lots of places to buy fasteners in the sizes and quantities you want. I can recommend Stigs Stainless or Westfield Fasteners
BenPowell:
Hi everyone,
Thought it’s about time for another update, I’ve had a productive few weeks and since been back on my 125 which I bought new when I was 17 I’m itching to get on with the CB350 project.
I know this topic has been discussed on here before but i was really having some difficulty in picking a colour to paint the engine, anyway I ended up trying about 5 maybe more different brands and methods before finally settling on one which I preferred which was the Dupli Color DE1615 and surprisingly a close second choice to that was the Halfords aluminium engine enamel. I also tried simoniz, auto tek and rust oleum but for me it didn’t look right. Some images below of the painted engine.
For anyone interested in the Dupli-Color I did two light coats followed by a third medium, painted in a warm room with 10 minutes between coats. Then once touch dry approx 1 hour I baked in the oven at 100 degrees C for 1 hour. (Not my kitchen oven though ;D)
Next topic, cam shaft & bearings. I was going through my parts checking for obvious signs of wear and my camshaft was looking a bit rough, some scoring/pitting and heavy wear on a couple of rockers, luckily I managed to find a NOS cam shaft but I need to either replace or modify the bearings since the one I have is past it. Think the bike might have been low on oil for a bit ::)
I’ve heard about the roller bearing mod but has anyone ever bored out and re fitted a brass/bronze bearing into the aluminium housing? I’ve got the equipment to do it at work but I haven’t yet looked at what the clearances should be or if that information is available.
Hopefully I should be getting the engine together soon and getting it back in the frame, which will be a big milestone.
Cheers,
florence:
My CB250K had phosphor bronze bushes put in as a modification. I replaced them in 1985 with standard ones as they had worn out. I don't know how long they had been in there as they had been done by the previous owner but they looked like a good bit of work. I still have them somewhere, will try to dig them out.
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