Question about 1992 Honda CB 750 Nighthawk

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Loosing oil from my 92 nighthawk american import

I am loosing engine oil from my nighthawk, it's going into the airbox and affecting performance. I also occasionally get a bit of a clunking noise at low speeds/ low revs. the bikes only done 20000 and its always been serviced although it did sit unused for nearly a year, Hope someone can help, thanks.

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It sounds like you got compression getting in your bottom end or a clog in a vent hose .check all vent hoses ,if its the first thing you need ring.sometime if it sits up the rings get stuck in the piston and wont reset

Posted on Sep 20, 2009

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If your oil is loose, then tighten it.
But seriously, sounds like rings. You could do a compression check and see which cylinder is misbehaving.... but that won't really do you much good. Best solution is to route a longer vent hose up under the gas tank and put a filter on the end, as there won't be enough pressure to blow any oil out the end of such a long hose. Only gas will escape. Don't forget to cap off the hole in the airbox from the line you removed.
Charles.

Posted on Mar 28, 2011

  • ChopperChas Mar 28, 2011

    If your oil is loose, then tighten it.


    But seriously, sounds like rings. You could do a compression check and see which cylinder is misbehaving.... but that won't really do you much good. Best solution is to route a longer vent hose up under the gas tank and put a filter on the end, as there won't be enough pressure to blow any oil out the end of such a long hose. Only gas will escape. Don't forget to cap off the hole in the airbox from the line you removed.



    Charles.

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