Moorron
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 posted on 31/3/10 at 06:13 PM |
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using oil, stripped what to do
Hi guys im stuck what to do next with my ZX12 engine.
i bought it this time last year, fitted it and it runs great, however its using 1 litre of oild every 300 miles. so ive done a compression test which
showed the 2 inner cylinders were at the min spec.
Today i stripped it down and had a look at the cylinders. all seems fine, no scoring and chipped pistons. Can i just buy 2 sets a rings and fit them
to the inner pistons and re assemble? The problem i have is being as bike engine the cylinder walls are coated with a hardened finish so i cant hone
them, im stuck lol. i dont know what to do next.
Any bike engine rebuilders here who can point me in the right direction.
Cheers
Andy
Sorry about my spelling, im an engineer and only work in numbers.
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turbodisplay
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| posted on 31/3/10 at 06:21 PM |
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What about the oil stem seals?
Could be where the oil is leaking?
Darrren
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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Moorron
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| posted on 31/3/10 at 06:30 PM |
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i was under the impression it would smoke on start up but i can only see smoke when its hot and i rev it to the limiter in neutral and as the revs
start to drop i see white smoke. its not the head gasket, oil and water arnt mixing. i cant zsee smoke when driving but i can smell it when i pull up
to junctions.
Sorry about my spelling, im an engineer and only work in numbers.
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Mark G
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| posted on 31/3/10 at 07:02 PM |
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From what you have said it does sound like it's burning the oil. It may be worth simply trying a thicker oil for high mileage engines.
Not a gauranteed fix but much cheaper than a rebuild.
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MikeRJ
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| posted on 31/3/10 at 07:20 PM |
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Check the ring gap.
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Moorron
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| posted on 31/3/10 at 07:26 PM |
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done it, manual says .25-.40 and i got .40.
checked the cylinder size and its ok too.
Sorry about my spelling, im an engineer and only work in numbers.
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perksy
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| posted on 31/3/10 at 10:12 PM |
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Just a thought
Did you check the bores for both taper and ovality ?
Check the oil control rings on the pistons ?
Did you try some oil down the bores and then re-test the compressions and note any differences ?
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Moorron
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| posted on 31/3/10 at 10:21 PM |
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bores seem round, i added oil when doing the comp test and it raised the readings from 140 psi to 175 psi. so im sure its bore piston based. but i
need to know if i can just replace the rings or do i need to deglaze the bores aswell, on a moddern bike engine which has some chrome type plating to
the cylinders.
Sorry about my spelling, im an engineer and only work in numbers.
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RichardK
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| posted on 1/4/10 at 07:58 AM |
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To answer your question, personally, I would put a set of rings in. Can't see it doing any harm, you'll just waste money on the rings and
gasket set if it doesn't sort it. Think it will though.
Cheers
Rich
Gallery updated 11/01/2011
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