SOHC.co.uk Forums > CB350/400

Acceptable / normal oil consumption

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Johnwebley:


  Just to put another idea,

  if the oil was a modern synthetic,maybe the rings haven't bedded in?

  have you ridden it to gently?

  I believe you have to get pressure behind the rings ,to force them against the cylinder wall to bed them in,

 ideally firm acceleration to 6k revs,then shut the throttle,

 I think the idea is to pressure the rings on acceleration,then with a shut throttle it sucks oil mist up the bores to lubricate them,.

I have heard of modern engines using lots of oil because the new owner drives them to sedately to run them in.

you have well over 500 miles on the clock,with the mineral oil,start to work it?

 try running it up to 8k in 3rd then slamming the throttle shut,

  it can't hurt

 

 

Cappodimonte:
Words fail me!

Nurse Julie:

--- Quote from: Johnwebley on September 25, 2022, 02:34:35 PM ---

  Just to put another idea,

  if the oil was a modern synthetic,maybe the rings haven't bedded in?

  have you ridden it to gently?

  I believe you have to get pressure behind the rings ,to force them against the cylinder wall to bed them in,

 ideally firm acceleration to 6k revs,then shut the throttle,

 I think the idea is to pressure the rings on acceleration,then with a shut throttle it sucks oil mist up the bores to lubricate them,.

I have heard of modern engines using lots of oil because the new owner drives them to sedately to run them in.

you have well over 500 miles on the clock,with the mineral oil,start to work it?

 try running it up to 8k in 3rd then slamming the throttle shut,

  it can't hurt

 

 

--- End quote ---
Totally correct there John. At over 500 miles there should be no pussy footing around at that mileage. You stand more chance of polishing the bores, which will make it smoke, if the engine isn't put under load.

Lobo:
An interesting thread to me as just beginning to break in a comprehensively rebuilt CB750 K2 engine… red line fyi 8000RPM.

But… despite all the varying advices here, I’ll be going with what the owners manual recommends - why wouldn’t you?

If interested, the relevant pages attached.

350Simon:

--- Quote from: Nurse Julie on September 25, 2022, 05:12:27 PM ---
--- Quote from: Johnwebley on September 25, 2022, 02:34:35 PM ---

  Just to put another idea,

  if the oil was a modern synthetic,maybe the rings haven't bedded in?

  have you ridden it to gently?

  I believe you have to get pressure behind the rings ,to force them against the cylinder wall to bed them in,

 ideally firm acceleration to 6k revs,then shut the throttle,

 I think the idea is to pressure the rings on acceleration,then with a shut throttle it sucks oil mist up the bores to lubricate them,.

I have heard of modern engines using lots of oil because the new owner drives them to sedately to run them in.

you have well over 500 miles on the clock,with the mineral oil,start to work it?

 try running it up to 8k in 3rd then slamming the throttle shut,

  it can't hurt

 

 

--- End quote ---
Totally correct there John. At over 500 miles there should be no pussy footing around at that mileage. You stand more chance of polishing the bores, which will make it smoke, if the engine isn't put under load.

--- End quote ---
How I rode it was keeping between 5 and 6k preventing the engine labouring at all, up to 60mph in top and let off the throttle back on throttle etc so as not to have extended periods at constant rpm.

Then as I neared 500 miles I started going to 7 and 8k through the gears riding quickly and again not staying at a constant speed for too long which is pretty much where I'm at now except I'm changing up around 8 or 9k, haven't gone to the 10k red line yet.

Interestingly when I'm riding at 60mph or below 6000rpm the mirrors are clear. However get to 70 or 80mph 6500 to 8000rpm and I can see a fog lingering behind me on the road. 

So it's not burning any perceptible amount of oil below 6500rpm but above that it's really quite evident!

I'm going to check the level a day or two as I'm nearing 700 miles and see where it's at.



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