Remembering why I
dislike working on
AO Silver Member
Join Date: Sep 2001
Have to disagree with using a semi or synthetic oil for running in - the rings probably won't bed properly if you do.
...and there's another whole topic - ring bedding.....
FWIW...have you seen what manufacturers do to new engines on the production lines? I run in new engines using the tried and tested methods that the likes of A.G Bell (the tuning guy, not the telephone one), Guy Croft and many, many others suggest.....using a decent mineral oil (no synthetic), from first start, warm it up by driving it gently (if at all possible - whatever you do, don't let it sit idling for ages), then once warm, load it up a bit to mid revs then let off the throttle and allow it to slow down naturally using engine braking so it can suck some oil up to lubricate the rings, then repeat a few times, then do it all again, gradually increasing load and revs in 4 or 5 steps until you are at WOT and near max revs...then go change the oil and filter for your oil of choice, drive moderately/normally, then at 500 miles change oil & filter again. It will gradually ease out over the next 20k or so, no doubt, but the real work is done very early on....or not at all, and you end up with an engine that uses more oil than it should and doesn't make quite the power it should.
There's a website done by some US bike guy who implies he discovered/invented this method....but it's been around for years...and I guarantee you'll hear many others, inluding the baby it for thousands of miles camp.
...but again, just look at what the OEMs do.....you'll see a certain similarity to what I paraphrased above....
....and none of this is my invention, I claim no credit for anything here. If you don't agree, take it up with the likes of AG Bell and every OEM I've ever seen a program about, showing how they make a car/bike/engine!