Main Motorcycle: 1999 T'Bird Sport
Join Date: Apr 2007
Location: Rangiora, New Zealand
Other Motorcycle: 1977 T140
|Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.|
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Research has shown that piston rings in particular are bedded in within the first 18 full revolutions of the running engine (cast iron compression rings) when the revolutions are high 2000-3000.
You could get through more than 18 revolutions just trying to start the thing, if anything's amiss!
What should one do if that happens? Whip the top end off and fit another set of new rings?!
Seriously though, I'd agree with keeping revs between 2000 and 3000 on first start-up, until warm anyway (though I wouldn't call such revs high). I don't think I'd ever start a cold bike and immediately let it idle.
I think what the differences in opinion exposed by this thread show is that breaking-in//bedding-in/running-in methods really aren't that critical - they will all work well enough provided a reasonable degree of common sense is used.
Originally Posted by MrPete
This won't happen if you close the throttle every few seconds to allow the piston to cool.Closing the throttle for a few seconds also draws oil up to the rings,
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