SOHC.co.uk Forums > CB350/400
Acceptable / normal oil consumption
Oddjob:
Surprised Julie didn't say yes or no for Graham or maybe that would be a bit cheeky, I hate it when my missus volunteers me for jobs.
350Simon:
--- Quote from: Oddjob on September 14, 2022, 06:28:28 PM ---Surprised Julie didn't say yes or no for Graham or maybe that would be a bit cheeky, I hate it when my missus volunteers me for jobs.
--- End quote ---
Yep I know that feeling!
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Cappodimonte:
--- Quote from: 350Simon on September 14, 2022, 11:10:37 AM ---What would be considered normal for a 350/400 sohc?
I've done 500 miles of running in new pistons and rings, the bores were properly machined and honed and I know that my valve guides are on the upper end of the serviceable limit.
Oil level is just above the min mark on dipstick after 500 miles. Is this acceptable or should I really get the head reconditioned?
I'll be honest I can't detect any smoke from the exhausts in my mirrors while riding or at idle but my friend said the other day there's a faint haze when I'm giving it the beans.
Having seen your missives and having worked on Hondas whilst in the trade I never came across any Honda car or bike that had a 500 mile per pint consumption. There is something seriously wrong and with the data you provided I’d have walked away from that one as it appears to have been done on the cheap.
No way would I have taken it down to piston rings and honing without doing work on the whole head with complete strip down, that’s a recipe for problems that you seem to have incurred. If one valve stem has loosened then the whole shebang needs doing. Another fault could be the piston rings being put in the wrong piston step or even upside down in the right one and yes I came across that but not on a Honda.
500 mile run in and giving it ‘The Beans ‘ is not conducive to running an engine in even a Honda. I wish you all the best with it but I suspect you have inherited a moving money pit.
Cheers
Simon
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Cappodimonte:
As a thought, what oil have you used?
If you use modern 0-30 oils then that will go up past th e pistons and down the valve stems.
You should use a 10-40 mineral oil or equivalent, Hondas clearances we’re close but not to todays micron standards.
350Simon:
--- Quote from: Cappodimonte on September 17, 2022, 06:23:02 PM ---As a thought, what oil have you used?
If you use modern 0-30 oils then that will go up past th e pistons and down the valve stems.
You should use a 10-40 mineral oil or equivalent, Hondas clearances we’re close but not to todays micron standards.
--- End quote ---
No idea what oil was in it but it came out very very black and thin so I suspect it was breaking down which wouldn't help.
I've filled her up with 10W40 mineral oil and done another 100 miles so far, I'm now not getting any smoke that I can see while riding, a small amount if I blip throttle hard on the drive.
Just going to put some more miles on it this week and if it uses a load then I'll replace the guides.
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