Which CB175 cylinder head have I got?

ashimotoK0

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Hi,

I sold a friend my 7k mile CB175K5 USA import project last year. The engine had been previously stripped years ago and I had it stored at work.

Somewhere along the way the cylinder head went AWOL so I bought a replacement off eBay for him. The seller sold on eBay it as he had a K0 model and the head he was selling was supposedly for a later model.

I helped my mate rebuilt this head with NOS valves, stem seals etc and the engine is built up and in the frame ready for the exhausts to be fitted. I gave him NOS exhausts with the project. However, when he tried to fit them the exhaust header collets are way too long but I am convinced they are correct for a K5 model. Could it be possible that the head is a K0 (sloper) not a K3 -> K6 (upright model) cylinder head? His instinct is to cut down the collets but I have told him not to do that until we have fully established what the real problem is.

After he had built the engine, I actually found the 'missing' K5 head and we are going to do a comparison tomorrow.

Meanwhile, how can I identify the differences between a K0 and the later head? If it is a K0 head, can it be used on the K5 or is it best to swap back to the original (engine out, strip and a lot of work)
 
Here are a few pics of a 1968 CL175K0 Sloper head and I don't believe the upright head and the Sloper head are interchangeable. The exhaust systems are definitely different where the pipes enter the head with the upright head using a different length of header and angle on the inlet pipes.

P1090165.JPGP1090169.JPG
 
Thanks for replies.. the exhaust headers were not feeding into the ports fully ... I think this may be because he has the mounting bracket of the silencer (muffler) incorrectly mounted.

So the head is correct for the K5
 
ashimotoK0 said:
Thanks for replies.. the exhaust headers were not feeding into the ports fully ... I think this may be because he has the mounting bracket of the silencer (muffler) incorrectly mounted.

So the head is correct for the K5
Click to expand...
It helps if you remove the front heat shield off the two forward sections of the pipes. With the heat shield installed it limits the amount you can flex the adjustment to the header pipes where they enter the exhaust ports.
 
Flyin900 said:
It helps if you remove the front heat shield off the two forward sections of the pipes. With the heat shield installed it limits the amount you can flex the adjustment to the header pipes where they enter the exhaust ports.
Click to expand...
That would be the CL pipes, not the CB ones. Assume Ash's issue now resolved ?
 
Yes thanks ..issue now resolved and it is the CB model.

Thanks for the great K0 pictures though ... always handy to know the differences.
 
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