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Running XT 600 on one litre of oil Running XT 600 on one litre of oil
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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.
Photo by Marc Gibaud, Clouds on Tres Cerros and Mount Fitzroy, Argentinian Patagonia

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  #1  
Old 27 Jul 2016
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Expanding on this a bit. This engine is a "dry sump" engine. It is not exactly dry but the bulk of the oil is external to the engine in a tank or in the frame depending on the model. The engine has a flow back check valve that is supposed to stop oil from draining back into the sump when not running. This valve is not perfect and if the least bit worn or dirty the oil will drain back. Checking oil after sitting for quite a while will always show the oil to be low, never fill it based on this.

As already stated, run the bike for a few minutes around the neighborhood to warm it and get the sump all pumped out of excess oil. Check oil soon after shut down making sure the bike is upright.

The flow back valve is a steel ball and a replaceable rubber sealing surface located at the bottom of the clutch cover case. It is very easy to replace, the rubber seat is all that needs to be replaced as the steel ball is rarely defective. Be sure to have a replacement clutch cover gasket in case the old one tears and they usually do.

This is a recurring theme with new owners. This why I expanded on this for those who come along and read and learn. This is what forums are good for.
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
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Old 27 Jul 2016
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Thanks for the helpful replies. I hadn't thought of the possibility that the oil might all be sitting in the sump. At least I've now got a handy checklist of all the bits I need to do before I get out and have some fun on it. Now I just have to find a manual.... (The links in the Sticky section at the head of this forum don't seem to be working anymore).
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Old 27 Jul 2016
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Try this one, you dont need for the 4pt, 3tb have same spec on most of the tech stuff. Repair / Service manuals - Yamaha
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Old 28 Jul 2016
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Thanks for the detailed advice steveloomis. As you probably guessed this is my first attempt at getting an old bike back together so your information is really useful. Can I just ask - is there any way to tell if the flow back valve and recirculating system is working without opening up the engine? Or should I just replace the rubber seal and gasket anyway at the same time as changing the oil and oil filter? Thanks again for your help.
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Old 28 Jul 2016
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Quote:
Originally Posted by connal View Post
is there any way to tell if the flow back valve and recirculating system is working without opening up the engine? Or should I just replace the rubber seal and gasket anyway at the same time as changing the oil and oil filter? Thanks again for your help.
Check oil level when you park bike, check again next day. If the same amount valve is ok, if its empty you need to change. Just remove cover and change it, its easy.
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Old 29 Jul 2016
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More info & pics i posted of the valve HERE

And like the guys are saying, check when bike is level (not on side stand).

Mezo.
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Old 29 Jul 2016
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Very good pictures, just scroll down until you see the check ball seal and spring behind the ball.
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Old 29 Jul 2016
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Great. I've bought all the bits and am looking forward to getting into the job this weekend. Would you say a torque wrench is essential or can I get away with just using common sense when tightening?
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Old 29 Jul 2016
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Originally Posted by connal View Post
Great. I've bought all the bits and am looking forward to getting into the job this weekend. Would you say a torque wrench is essential or can I get away with just using common sense when tightening?
Yes buy torque wrench, specially for the 9 and 10nm like the cover for oil filter. Yes you can do at by feel, but one day you do a little more and threads are gone..I use it for all bolts.
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