dirtbike making blue smoke

zxcvbnm · Renault 5 Driver Joined: 27 May 2008 Karma :

hi i recently had my crank go on my 2000 honda xr100 dirtbike, so i took the top end off the 2000hondaxr100 and put it on a 1985xr100 bottom end i had around. but ever since i did that it makes blue smoke when its cold or at other odd times, but not when going fast. i dont no y this is anyone know?
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hmmmnz · Super Spammer Joined: 22 Aug 2006 Karma :

blue smoke indicates that you are burning oil,
so probly duff rings,
or a scored barrel
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Blue_SV650S · World Chat Champion Joined: 27 Nov 2008 Karma :

If it is predominantly on startup, then it is more likely to be the valve stem oil seal.
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random_rob · Two Stroke Sniffer Joined: 16 Mar 2010 Karma :

check oil level, putting too much in causes this problem! Be sure to check level when the bike is upright.

zxcvbnm · Renault 5 Driver Joined: 27 May 2008 Karma :

well the bottom end of the engine i put the top end on was kinda dirty from sitting outside for awhile, so there might have got dirt in it, with would of caused a scored cylinder, but does that seen i will have to re bore it again? because i already re bored it two oversizes like 5 mouths ago.
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zxcvbnm · Renault 5 Driver Joined: 27 May 2008 Karma :

and what do you mean by "duff" rings?
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random_rob · Two Stroke Sniffer Joined: 16 Mar 2010 Karma :

duff: knackered or dodgey

zxcvbnm · Renault 5 Driver Joined: 27 May 2008 Karma :

anymore suggestions on this problem?
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Cigaro · World Chat Champion Joined: 28 Mar 2007 Karma :

Did you check the oil level as said?

It must be burning oil somehow; as said it's probably a worn valve seal or the rings. There's not really any other way for oil to get into the combustion chamber Thumbs Up

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

is this a 2 stroker?

zxcvbnm · Renault 5 Driver Joined: 27 May 2008 Karma :

is a 4 stroke,and could the oil be going though the head gasket, becuase i dident buy a new headgasket when i did the rebuild...........
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random_rob · Two Stroke Sniffer Joined: 16 Mar 2010 Karma :

yes, but back to the origional question. Has it got TOO much oil in it? because if it has it will burn the excess oil, and there might not even be a problem with the engine itself.
Or even has it got the correct oil in it, the right viscosity and brand to what the service manual says.