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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 8 Apr 2008
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xt 600 1990 3aj oil leak

Hi all ive recently got this bike knowing it had a oil leak,found out it is pumping upfrom the left side of the block. Where i think its a breather pipe that is just in front of the starter motor and goes up to the air box. Ive had the oil cooler off cleaned it out no blockages,so at a dead end at the moment. All help appreciated thanks.
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Old 9 Apr 2008
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two possibilities I can think off. Not So Good and Bad.

Not so Good

Too much oil in the system... sometimes as the bike ages the ball and spring that seals the oil feed ....

See page 32

http://www.xt600.de/xt_werkstatt/%2B...-600-83-89.pdf

check parts 22 and 23.


...just behind the oil pump. Oil pump pressure opens against spring pressure allowing oil to flow. If this has fouled, or the spring is weak, oil will flow into the sump. It's not a major biggie though, but it does make checking oil level a PITA with a tendancy to overfill. Of more concern would be a blocked oil filter



Bad

Your rings might be blown creating to much blowback crank pressure.

Last edited by bruken; 18 Apr 2008 at 15:59.
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  #3  
Old 9 Apr 2008
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oil eak

Hi bruken thanks for the info will start checking these tomo and hope its one or the other.
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