Quote:
Originally Posted by
Metzy
On run in most of the metal would be coming from the gearbox. Personally I think the change at 100km was a bit of a overkill maybe 500km for the first, but it is hard to go past your pictures of the filters stacked up against each other. Would have been interesting to have the oils analysed at the 100km, 200km and 500km oil changes to see contaminates in the oil. I do agree with Kev in saying that mineral oil should have been used in the run in period. Another note would be the run in period would vary dependent on the individual person and bike.
|
Quite so, the famous (or infamous) Motoman will tell you to ride it hard at break-in :
http://www.mototuneusa.com/break_in_secrets.htm
I think his argument makes sense, namely that it is the pressure inside the cylinder that forces the rings against the wall and that therefore babying the engine will not seat the rings. It has been noted however that because of the metal in the oil at this stage, running the engine at high revs will force this debris all the more into bearings and other nooks and crannies. So probably it would be best to change the oil after 20 miles, as he says by then most of the wearing will already have taken place, and then only run hard to seat the rings.
Quite a fine art really.
Incidentally, the same advice as to changing the oil frequently during this period can be found there, quote :
" Q: What's the third most common cause of engine problems ???
A: Not changing the oil soon enough after the engine is first run !!
Change Your Oil Right Away !!
The best thing you can do for your engine is to change your oil and filter after the first 20 miles. Most of the wearing in process happens immediately, creating a lot of metal in the oil. Plus, the amount of leftover machining chips and other crud left behind in the manufacturing process is simply amazing !! You want to flush that stuff out before it gets recycled and embedded in the transmission gears, and oil pump etc...
Why do the manufacturers recommend waiting until 600 miles to
flush out all the loose metal ???
This is a good question ... "
Another thing worth getting rid of that I remember having read about is the casting sand residue that will always be present in a new engine.