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CB750 / Re: CB750 sohc F2
« Last post by archmill on Today at 07:19:43 PM »Thanks K2-K6, answers my original question as to whats the front of the piston.
I don't think the top pocket has been re-cut, I think a valve has been hitting it.
Yup, the small triangles at 2 o'clock are just small dents with carbon, not anywhere the ring land.
Pistons could have been turned as the valves I took out did not match and I recon it either dropped a valve at some time or a valve head decided to part company with the stem and possibly someone cleaned the damage on the piston top.
I am fitting brand new valves from Cyclex in the USA and had to replace one of the liners which had a big gouge out of the side wall, funnily enough the shape of a valve edge.
I will indeed take onboard your suggestion with the plasticene. Going to re-build everything without torquing the head down and look at the valve clearances.
Again, many thanks for your advice.
I don't think the top pocket has been re-cut, I think a valve has been hitting it.
Yup, the small triangles at 2 o'clock are just small dents with carbon, not anywhere the ring land.
Pistons could have been turned as the valves I took out did not match and I recon it either dropped a valve at some time or a valve head decided to part company with the stem and possibly someone cleaned the damage on the piston top.
I am fitting brand new valves from Cyclex in the USA and had to replace one of the liners which had a big gouge out of the side wall, funnily enough the shape of a valve edge.
I will indeed take onboard your suggestion with the plasticene. Going to re-build everything without torquing the head down and look at the valve clearances.
Again, many thanks for your advice.