Question about Honda CB 700 SC Nighthawk Motorcycles

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I have a 1983 Honda Nighthawk 650. After I run the bike a while the oil lever drops out of sight on the dipstick. If I refill the engine with oil to the top of the dipstick that amount of oil will gush out of the dipstick fill hole when the engine cools. At first I thought that gas was leaking past the floats and into the crankcase. I also thought that the oil viscosity could be too high so I changed to 10-30 oil as recommended without any sucess. I've had a number of Nighthawks, Shadows,Sabres and a Goldwing and never had this problem before. I'm all out of ideas, can you help me ?

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Check under the valve covers to make sure the rocker/cam bay is draining properly back to the crankcase. Open any clogged holes. Aside from that possibility, I'm stumped too. :-(

Posted on Sep 09, 2010

Testimonial: "I would never have thought of that. Could the seal on the oil filter be bad and letting the oil drain back into the crankcase ?"

  • Jeffrey Turcotte
    Jeffrey Turcotte Sep 09, 2010

    Seems like the oil would have to go backwards thru the pump to get back to the crankcase, but I'm not familiar with the design of your engine, sorry. If it were my design, I would want the filter oil to drain back from the upstream side of the filter--that way you never have to worry that you are over- or under-filling the crankcase.



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Hi George,
Excellent description of your problem, I presume you are keeping the bike upright when checking the level on your dipstick?
I remember on some Honda's there used to be a Sight glass set in the Gearbox casing a small round Window with level marks up either side so when bike held upright the glass should be half full.
George! you should be able to see oil on the stick without running the bike so keep upright and top up as necessary.
Hope this helped, please remember to rate my effort?
Paul 'W'

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