Join Date: Apr 2011
Thanked 11 Times in 8 Posts
(Most) Motorcycle Magazine writers are not the 'pros'. Mechanics are not the 'pros'. The only pros are the engineers and their tester co-workers who actually design the motors. Give a mechanic a cylinder block that has had a minor change in the alloys used in the bores and they would not know what to expect from the difference. Only the engine designers really know what's going on. Everyone else, including me, are just ignorant users of their creations. I would follow the manufacturers specific recommendations for the specific bike, and no, the instructions are not all the same, likely because the engines are not all the same. We're lucky that the CBR250R doesn't have break in rev limits, so enjoy it..
BTW, I had an interesting conversation with a fellow ignorant user who's big hobby was building serious drag bikes. Of all people, HE has an interest in getting the most power out of his engines. He says that the engines last for one racing season and he rebuilds them fresh each year for the start of a new season (now there's a guy who really has to break it in carefully or else lose the races !)...
Thing is, I asked him how long the engines last. He said 'one season, that's about 20 runs'...
OK, so that's a careful 'pro' breakin for an engine that's mean to run for 5 miles and then get rebuild because it's worn out :-)
We can be a little more lenient with our engines because we (or at least I) won't be making those kinds of demands on them...