Bleedin' compression! Help!

paulospug · L Plate Warrior Joined: 04 Nov 2009 Karma :

Hi.
recently bought a 1997 cr125, but as a non runner. Compression was totally down but previous owner told me he had put a piston/rings in it. You can push the lever by hand so must be very low - managed to start her up the other day and revved ok, but turned it off quickly as there was no water in it and didn't want to damage it.
Once put water in, it threw it out whilst running of the head gasket and was spurting out so again turned it off.
If a bike has lw compression, can it be the 'crankcase oil seals' as someone said, or is low compression normally piston, bore, rings or head gasket?
If i know this, i can then move forward lol.
Thanks, and any help will be greatly appreciated.
Paul Wink

Cigaro · World Chat Champion Joined: 28 Mar 2007 Karma :

If water's pissing out of the head gasket, I'd say that it's probably the head gasket that's gone.

Gareth · Nova Slayer Joined: 03 Nov 2009 Karma :

Hi Paul

Have you considered using a compression tester. I am sure you will be able to check the compression dada for the model of your bike. An sounds like to me your head gasket has blowen, as said in other post. I would check the compression if it low it could be head gasket an piston rings. If the compresion was low it would be a pig to start as well.

Regards Gareth

Blue_SV650S · World Chat Champion Joined: 27 Nov 2008 Karma :

But you already know the head gasket is gone, why are you not just putting it down to that?

It is possible you have a cracked cylinder/liner/block/head, but you'll hopefully be able to see that when you have the head off for the head gasket??

The main seals going probably won't translate to much difference to 'feel' at kickstart.
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