Replace a cylinder sleeve / liner.

[Bryanj]

I agree with Julie and Trigger, chances of all 4 being in spec for round and wear is less than 50%

[Erwin83]

Sure, this is all basic logics.
I'm an optimist, so will simply assume it'll work out for me. The clearance check will give all answers.

[Trigger]

Sure, this is all basic logics.
I'm an optimist, so will simply assume it'll work out for me. The clearance check will give all answers.

And how are you going to measure the clearance with out buying some very expensive equipment ? 

[Erwin83]

I already own this measuring device:
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[Nurse Julie]

You will get better results using something more flexible

Sent from my I3312 using Tapatalk

[Moorey]

Have you been going to Ikea to get your quality measuring instruments.

[Erwin83]

  In all seriousness, I will obviously have that done at my machinist. The block needs a resurfacing anyways, and I wasn't planning on buying my own resurfacing machine either (I don't want to use the DIY method with glass or wood and grinding paper).

I did check fitment without having rings installed. The ovality is quite clearly noticeable. In the right direction (IN pointing to inlet port) the piston seems a bit on the loose side in the "new" lining, compared to other linings. If I turn the piston 90 degrees in the bore, it starts to pinch a lot.

The big question will be how big the budget is going to be to get this engine sorted, as I don't have a purpose for this engine now, since I just installed my fresh Big-Bore 466 engine.

If it indeed requires a new piston kit and a re-bore, I will probably shelve it again, but this time in a clean and dry spot.

[Erwin83]

You will get better results using something more flexible

Sent from my I3312 using Tapatalk

Those are again very usable tips.
Did I mention already that I love these forums? So much wisdom is shared 

[Bryanj]

You can actualy get a bore gauge on ebay for less than £30 then a 25 to 50 micrometer

[royhall]

Have you seen the £30 bore gauges off eBay Bryan. You would use it as a tyre lever, you get what you pay for. I was going to buy one until a VMCC member showed me the one he had bought, don't bother with them they are shite.

[Bryanj]

I must have used a different firm then cos i got a good one

[Erwin83]

So, that escalated quickly. I found a frame with an original 1973 Netherlands title for a reasonable price.
Now I have something to put this engine in, and to make the investments in this engine worthwhile.

Once I make some progress, I'll open a project topic for it.

[Orcade-Ian]

Hi Erwin,
I’m a little confused now - you made reference to 400/4 engines once being cheap, so is that a 350 or 400 engine you’ve been bringing back from the dead?  The frame you have is certainly 350.  No matter really as they both fit the frame anyway.  Are you intending building it to standard 350 spec or as a ‘special’ ?
A few of us were (are) a little concerned about your optimism but the worst that can happen is ending up with a ‘smokey joe’ but my mate has Kawasaki triples and I refuse to ride behind him - can’t keep my visor clean!
Anyway, we’re over in Duiven (near Arnhem) in May with the MX-5 folk so if you need any (small to carry) parts, I might have some.

Regards,

Ian

[Erwin83]

Hi Ian,

No worries. I share your confusion 
Let me (try to) shed a light:

I have a very nice CB350f which I own for 16-17 years already. That bike, I converted to a CB400f engine around 10 years ago (cheap engine), which I recently big bored to 466 cc.
Project is here: http://www.sohc.co.uk/index.php/topic,11483.90.html

During my ownership of that bike, I have collected quite a few parts as I bought 2 CB400f's for parts. I sold a lot of stuff that I didn't need, but I still have a cabinet full of stuff and had this engine laying on the ground.
I thought this spare engine was a 400f. It turned out to be a 350f engine (clutch cover should've been a dead give-away...).

Thanks for the offer! If I look out of my window (here in office), I see Duiven just across the river. I'll surely get back to you.

[Erwin83]

Next, my intentions with the extra frame:

First of all, the frame of my CB350f - 466cc has some small damages:
- Exhaust hanger is bent slightly, especially visible with the passenger footpegs down.
- Small holes drilled
- seat hinge is broken off
Since that frame is powder coated, it's not ideal to repair.
Also, the frame is of a CB350f, but the title says 1976, no 350f's were produced in '76.

So step one:
A frame swap.
I will truly have one 'perfect' original '73 CB350f (with a 466 engine though). I'll never sell this one.

Step two:
To build a custom Street tracker themed bike based on the not-perfect frame, with the engine I've started to refurbish in this topic.
This one will be for playing around this summer, and to sell on at some point.
--> hence it makes spending some money on this engine also worthwhile. I'll be going for a cruzin image piston set to prevent the smoking.

I'll open a project for it once I'm on the way.