Question about 1994 Yamaha XJR 400

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I put too much oil in my Yamaha bike. Is that bad for the engine?

She was only staying running for about 5 minutes each time i started her then she would slowly lose power & cut out. Im going 2 change spark plugs 2 see if ther da problem, wud they cause this? Thanks

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Yep, that's a problem. Too much oil inhibits flow, creates a vacuum, and can create a hydraulic block so engine parts can't move. Drain it out either by siphoning or sometimes it's easier to drain the whole thing and measure out what you need.

Posted on Apr 02, 2015

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Yes it will cause problems drain a bit either by the drain plug or use a small hose and syphon running it with too much can blow seals and blow the motor

Posted on Apr 01, 2015

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It won't actually make it cut out unless the oil amount is so high that it's throwing oil up into the airbox from the breather hose and burning the oil which can foul the plugs.the engine breather is the first place that excessive oil amounts will come out of and they usually go straight to the airbox which usually has a drain tube on it.so to answer your question properly if it's smoking out of the exhaust/s badly ie blue smoke then it's burning the extra oil off if it's not then it's no so high.drain it off until it's the right level ,but the cutting out is not likely to be from the oil it's more likely to he carburation.22 years experience as a motorcycle mechanic so I'm not talking boll*x.also check the drain tube on the bottom of the airbox is free and if it's plugged unplug it to see if it's got oil in it if it has let it drain out.and check the air filter n case it's saturated with oil.

Posted on May 02, 2015

  • adam bikedoc May 03, 2015

    It won't cause a vacuum as suggested nor will it cause the engine to hydraulic lock unless it's up over the height of the pistons and it obviously isn't as you said it runs.so there is a breather pipe on top of the engine which allows air flow as there is turbulence when it's running inside the engine as I said if it's that high it will spit it out into the airbox ,I'm not sure how experienced some of the people are who answer the questions but don't be led astray.I do this for a living and I have seen it loads of times I can assure you it's better than running out of oil but you still need to setit to the right level.

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Yep it will cause all kinds of problems

Posted on Apr 28, 2015

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Use engine oil designed for motorcycles.
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