Whats weird is that my YZ 250F had a suggested break-in time of 30 minutes. They said during that time you should run it between 1/4 and 3/4 throttle with occasional wide-open blasts of 10 seconds and that after 30 minutes you should change the oil, clean the air filter, retorque all the fasteners and the bike is ready to race.Originally posted by jonaddis84
[br]Break in on modern engines IMO is a good way for manufacturers to kill their warranty period. Since the exit of the flat-tappet roller cam and noncoated iron piston rings, there is virtually nothing in an engine that needs broken in. The break-in on the cylinder walls happens in probably about 30seconds, and there is obvioulsy no flattappet cam to break in, so why have such a huge retarded breakin period? So people that dont ride very much waste their whole warranty period riding like a btch.
Im not saying dont break it in at all, the best thing you can do for an engine is use engine braking as much as you can for a little while. Where do they come up with 100 miles under 6krpm and 200 more miles under 8krpm anyway, those are totally arbitrary numbers. I did about 60 miles of sub 8k varying throttle, now im riding like normal.
Thats fine on a 2-stroke, but if you do that on a 4-stroke you will end up with an oil burner.Originally posted by stretchSXV
[br]Ride it like you stole it. I put the first 300 miles on my viper hard and fast. WOT and hole shots. Not gonna baby a sled. break it in how you plan on riding it is my motto(that came from a buddy of mine who works on sleds)