Question about 2005 Honda CRF 250 R

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I put new rings in my Honda CB 550K it runs well but after about 30 miles it smokes . How long do new rings take to bed in ,and what oil should I use? Charlie (South Africa)

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It could just be burning some old oil in the exhaust . get some costic soda and give it a clean out . did you give it a reboure ? if not was there any markings in the bore ? did you oil the bore up before putting the rings in to allow them to wear in ? or did you put them in dry ? as you may have done the rings in again .

Posted on Sep 06, 2010

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Could also be worn or leaking valve guides allowing oil past the valve stems. They are leaking when cold but seal when they warm up and expand.

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I put the wrong type of oil in the engine and the result was gray smoke out of the exhaust. i have changed to what it should have been and still have the smoke . what could be causing the smoke?

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It also may ruin something.The only things that prevent oil in the exhaust system is - turbo seals , piston rings and valve steam seals.
If smoke will not stop after a short trip (3-7 miles)
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125 twin recent rebore 1000 miles ago one exhaust

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1 Answer

It just began smoking a bit,hope new std. top end can apply.

You opened the engine for a ouff of smoke at roughly 48,000 miles? A bit premature for a honda. Yes, ring end gap is necessary. Put it back together and change your oil. Finding out where the gas came from should be your concern. Sorry.

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id say its time for a new set of piston rings sounds like youv got a busted oil ring

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Thanks Rob.

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