SOHC.co.uk Forums > CB350/400
Engine oil use?
Nurse Julie:
My brain is still thinking 😀😀😀 Are you checking the oil level correctly each time. Cold engine, bike on centre stand, clean dip stick, put dip stick back in the hole, do not screw it back in, just have it resting there on the lip and check level. You say there is no evidence of blue smoke from the exhaust 🤔, have you had someone ride / drive behind you to confirm this? Either the oil is leaking out or burning out.......either way, it's coming out, we just need to find from where. Don't worry too much though, these engines are as tough as old boots and I'm sure you don't ride it like a maniac 😀😀😀
Bradders:
Thanks Julie. There is a weeping of oil half way down number 1 cylinder (what I would call the fin). Would that be enough to lose that much oil? Please excuse my ignorance but when you say put oil down the bores does that mean remove the plugs and put oil down there? How do I know when the pistons are not at Top dead centre?
Bradders:
--- Quote from: Nurse Julie on May 28, 2019, 10:16:59 PM ---My brain is still thinking 😀😀😀 Are you checking the oil level correctly each time. Cold engine, bike on centre stand, clean dip stick, put dip stick back in the hole, do not screw it back in, just have it resting there on the lip and check level. You say there is no evidence of blue smoke from the exhaust 🤔, have you had someone ride / drive behind you to confirm this? Either the oil is leaking out or burning out.......either way, it's coming out, we just need to find from where. Don't worry too much though, these engines are as tough as old boots and I'm sure you don't ride it like a maniac 😀😀😀
--- End quote ---
I will get my wife to follow me tomorrow to see if it’s blowing any smoke out. I’m checking the oil as you say. My son always laughs at me as he says I ride like an old man😀. Thanks for your time Julie.
Trigger:
--- Quote from: Oddjob on May 28, 2019, 10:40:31 PM ---
--- Quote from: Nurse Julie on May 28, 2019, 10:16:59 PM ---My brain is still thinking 😀😀😀 Are you checking the oil level correctly each time. Cold engine, bike on centre stand, clean dip stick, put dip stick back in the hole, do not screw it back in, just have it resting there on the lip and check level. You say there is no evidence of blue smoke from the exhaust 🤔, have you had someone ride / drive behind you to confirm this? Either the oil is leaking out or burning out.......either way, it's coming out, we just need to find from where. Don't worry too much though, these engines are as tough as old boots and I'm sure you don't ride it like a maniac 😀😀😀
--- End quote ---
I'm sure there was a thread recently saying we had got it all wrong on checking oil levels, should be hot, screwed in not cold on top of threads.
The way you describe is the way I always checked the oil levels Julie.
--- End quote ---
I have added the correct amount of oil to rebuilt engines and the oil level is spot on the dip stick without screwing it in.
The workshop service manuals state : The machine should be upright on a level surface, DO NOT screw in the dip stick, just rest it on the boss for the correct level ;)
Nurse Julie:
If you are not too sure or don't feel too confident doing this, maybe consider taking it to a garage for them to do. But yes, remove all the spark plugs. I would 'feel' the top of one of the end pistons through the spark plug hole by resting something like a screwdriver on the top of the piston to determine where in the barrel the piston is sitting, which would also tell me what position the middle two pistons are in. If the one you are checking is too high or too low,you need to turn the engine over until the piston you are checking is sort of half way up the barrel. Put the oil through the spark plug hole, so the oil will be going onto the top of the pistons and will gradually seep down the side of the piston and around the rings and just leave it like that for a couple of days. Put the plugs back in so nothing can crawl, or fall in. And make sure you dont cross thread the plugs, start them off with your fingers so you can feel them in the thread before using plug spanner. After a couple of days, start and ride bike as normal,it may smoke a bit to start with as you will be burning off the residue of oil on top of the pistons.
Any oil around the head or barrel fins means oil is getting out through a gasket or O ring somewhere. It may be a combination of the oil leak and burning some oil that is making you use the amount of oil you are.
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