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Help with a 82' KZ650 CSR H2
- bigc
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- wiredgeorge
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wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!
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- 82_gpz_550
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but the breather in the pic looks like it's coming up from the back around the tranny/starter area. So how is blow-by getting oil way back there, unless it's like a car and the valve cover is attached to the breather by hose, or maybe I'm missing something completely
82 KZ550 H1 (GPz) \'Lil Red
it\'s an old beater, but when she wants to
she sure runs great!
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- steell
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maybe I'm confused by this post.
but the breather in the pic looks like it's coming up from the back around the tranny/starter area. So how is blow-by getting oil way back there, unless it's like a car and the valve cover is attached to the breather by hose, or maybe I'm missing something completely
Never had a kz motor apart have you?
The engine oil is also the trans lube, it's a shared crankcase, that vent is for the entire case, motor and trans, it's all one.
KD9JUR
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- wiredgeorge
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To fix the problem, you first must know what the problem is. To determine where to go in a problem like this once you know it is ring related, you have to pull the pistons out of the block. If the pistons appear to be all OK and in one piece you then measure the piston's diameter and the diameter of the bore. The difference is the piston to bore clearance and there is a MAXIMUM spec. If your piston-to-bore clearance exceeds the maximum, you will need to either buy oversized pistons OR buy a used block with matching pistons that are within spec. If the piston-to-bore spec is within tolerance, you can then buy some new rings and hone the cylinder walls and will be back on the road without the blow-by.
wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!
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- 82_gpz_550
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I don't see haw oil going past the piston rings was causing oil out the breather
I would assume if oil is coming out the breather,
there is WAY too much oil in the engine
82 KZ550 H1 (GPz) \'Lil Red
it\'s an old beater, but when she wants to
she sure runs great!
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- steell
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that I did know, I was confused cause wired made it sound like it was blow by causing the oil out the breather.
I don't see haw oil going past the piston rings was causing oil out the breather
I would assume if oil is coming out the breather,
there is WAY too much oil in the engine
AFAIK, blow-by has always referred to compression getting past the rings into the crankcase, and when the blow-by is significant it will indeed blow oil out the vent. Oil getting past the rings has just been referred to as oil consumption in my experience.
When the crank is spinning it's throwing oil from the rod journals 360 degrees, and with significant blow-by the air stream will carry oil right out the vent with it.
Granted, I have only seen that when one or two cylinders are bad, if all cylinders are that bad I doubt the motor would even run.
You are probably right about the motor having way to much oil in it to begin with.
KD9JUR
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- 82_gpz_550
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it makes perfect sense now,
after so many days of work, I can't think too well
82 KZ550 H1 (GPz) \'Lil Red
it\'s an old beater, but when she wants to
she sure runs great!
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- kawaidioot
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It is not normal, that oil would come through the breather.
But if the breather wouldn't work as good as this,....the pressure would come out of another gasket...
Zevenhuizen, Holland, Europe.
a good 15 ft below sea-level....
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