SOHC.co.uk Forums > CB350/400

Engine oil use?

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Bradders:
Ok thanks. Will have a look tomorrow at the air filter. Thanks again for your speedy replies.

dave400:

--- Quote from: Bradders on May 27, 2019, 08:55:18 PM ---Evening all. Sorry got another question. I’ve had my 400/4 a few months now and was wondering how much oil its normal to use? I estimate that I’ve used about 1.5 litres and riden about 800 miles. Is that about normal or have I a problem? There’s no obvious oil leak that I can see and haven’t noticed blue smoke out of the exhaust.

--- End quote ---

Blimey..I can’t remember ever having to top up oil on my 400, yours seems to have a problem if it uses that sort of amount I’m at about 20K miles with mostly original metal parts but new seals and other bits and pieces.......Dave

Bradders:
Hi Julie. Had a look at the air filter and foam in the bottom of the air box. Seems pretty dry and good there ( to my untrained eye). Will try K2-K6 Redex idea and see what happens. Is it ok to still use my bike with this oil problem or is it likely to make things worse?

Nurse Julie:

--- Quote from: Bradders on May 28, 2019, 09:45:11 PM ---Hi Julie. Had a look at the air filter and foam in the bottom of the air box. Seems pretty dry and good there ( to my untrained eye). Will try K2-K6 Redex idea and see what happens. Is it ok to still use my bike with this oil problem or is it likely to make things worse?

--- End quote ---
As long as you check the oil level and top it up regularly you will be ok but, in the longer term, as Nigel suggested, you really need a compression test to see what's happening. It may just be stuck piston rings. What you can do for now is put some oil down the bores, to see if it will free off the rings, (about 10 ml I think), when the pistons are not at top dead centre and leave it for a couple of days, then ride the bike and see if this has any effect on the oil consumption. If it is still using loads of oil then a compression test is definitely the next course of action.

Nurse Julie:
Another thought....have you looked absolutely everywhere for an oil leak?

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