Honda-SOHC

My initial main clearance for the crankshaft measurements is below. Its the result of 32 - the measurement.

stator end on the left

0.01124mm  0.01632mm   0.01378mm  0.01378mm   0.01378mm

Crankcase codes are B A A A A

If im reading the chart correctly I would need 1 green 4 brown. Does that sound correct?

Rechecked it and it should be 1 BROWN and 4 GREEN. I dont think i could do all 5 brown, it would be too little clearance for the A marked ones.

Where is 45 coming from?

I understand the + and - I just can't figure out + and - from what figure.

What is the base measurement for the mains and connecting rod sizes?

The haynes manual says +x number but plus from what base measurement?

My plan is when the new crankshaft arrives, figure out the shells needed from the codes and order 1 set, then try that set with plastigauge and see what it shows. I'll then probably ask for some advice here.

Ive tried to figure it out and looked through other posts. But how do you work out the shells needed from the crankcase codes?

Would these be the ones to use for the new crankshaft?

If 400four bits has one he is a member on here as as far as i know fully trustworthy.
Personaly i would buy crank and rods as chances are the big ends would be ok and you would only need to buy mains.
No offence meant but if you are ordering a micrometer to measure the mains you wont be accurate enough, the correct use of mics is an art and the accuracy required is not easy to learn, you would be better taking it to a good engineering firm for accuracy

just thought I'd give it a go with a micrometer and plastigauge. If crank and rods are the way to go I'll do that.

What would you go for out of these two: option 1 https://www.ebay.co.uk/itm/312044879538?itmmeta=01HQXPVR92HVDMQ5AS8Q6HNVN8&hash=item48a752feb2:g:ZS4AAOSwi0lg3u8q

option 2 https://www.ebay.co.uk/itm/313344578679?itmmeta=01HQXPVR92FYBSGWTXTKKDEPWH&hash=item48f4cad477:g:13QAAOSw5FRgbExl

I bought a crank & con rods from DK for my 500 - they were as described - the con rods shell were like new. 👍👍👍

Whats DK?

Before you go and spend a shed load of cash on new shells get yourself some green plastigauge for £10 and measure the shells you have. Take some photos and post them here and do the same for the mains. The experts on here will be able to advise if the shells are scrap or useable (and assuming they are within tolerance after measuring with the plastigauge).
As has been said previously, please make sure you have made a note of where each individual half shall has come from and if it came from the top or bottom crankcase half. Post some photos of the journals as well.
One item not mentioned for your parts list is a tube of Hondabond. You will need this when assembling the crankcase halves. It's not cheap and don't be tempted to use instant gasket, you'll regret it when it blocks up the oilways and wrecks a newly rebuilt engine!
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Ive ordered some plastigauge green, should be here next week.

My nail doesnt catch on any of the crank case bearings but does slightly catch on the con rod bearings. I went to the engineering firm at lunch today, who fixed my tensioner for his opinion, he's been doing engine work for 40 years and has been recommended by a local restorer who uses him who has done work on previous cb400fs he was restoring. He said they dont seem too bad and would just replace them like for like. I'm going to wait until I can test it with the plastigauge before I pull the trigger on anything.

Upper crank case




Lower crank case



Con rod example



Another con rod