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Author Topic: why do I smoke(cb750)  (Read 821 times)

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Offline bikerbart

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why do I smoke(cb750)
« on: July 11, 2010, 10:02:49 AM »
the manuals say its always rings.I rebored and installed new rings,so what then?I did NOT yet do valve stem seals.Could that be the culprit?I dont understand it.I pulled my head and the bores are good,you can still see crosshatching from the hone(after about 6-700 miles)The bike fires right up and no loss of power???
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its better to regret something you have done,than something you havent.Except playing with explosives.

Offline lowflyingdutchman

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Re: why do I smoke(cb750)
« Reply #1 on: July 11, 2010, 10:07:13 AM »
Your cigarette is not all the way out.

Sorry. Couldnt help myself.

What color is the smoke?
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Offline Alan F.

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Re: why do I smoke(cb750)
« Reply #2 on: July 11, 2010, 10:14:19 AM »
Quote from: bikerbart on July 11, 2010, 10:02:49 AM
I did NOT yet do valve stem seals.Could that be the culprit?

Probably.  Replace them with genuine honda valve seals since they have a 'washer' embeded in the top part of the seal unlike the other brands and will provide a better service life.

Worn out valve seals = oil running past the valve guides and into the chamber.

Are you losing using burning much oil?
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Offline bikerbart

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Re: why do I smoke(cb750)
« Reply #3 on: July 11, 2010, 02:16:19 PM »
I am burning but I only notice downshifting and taking off from a stop.I have new seals which I am going to replace in the next couple of days.I am have disasembled the top end and am almost ready.
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its better to regret something you have done,than something you havent.Except playing with explosives.

Offline Alan F.

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Re: why do I smoke(cb750)
« Reply #4 on: July 11, 2010, 03:36:41 PM »
Well if the seals don't fix it I'm out of ideas.  Good luck with it.
A
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