300ex Topend Break in

[Sjorge450R]

Just wondering how to break in my top end rebuild on my 300ex.

Thanks
Steve

[ZeroLogic]

Keep the RPMS down. Don't rev out the machine. Don't give it more then 1/4 throttle. Do this for about 2 gas tanks.

[hawaiiansupaman]

http://www.mototuneusa.com/break_in_secrets.htm

worked for me

[Honda TRX250ex]

i did mine for 10 hours no more than 1/4 throttle and dont hit higher than 4 and it worked great for me

[Sjorge450R]

there is no way i can keep it at 1/4 throattle for 10 hours. I have a race Feb 5 and this wont be back together until next weekend. I dont have land to ride on so is there a such thing as a hard break in?

[2muchquad]

theres always going to be a difference of opinion as far as engine break in goes,ask 10 different people you'll get 10 different answers! i was told a long time ago to use varied throttle with no big loads on the motor for a half hour or so.by then the motor is up to temp and the cylinder and rings are seated etc.i have never had a problem with this in the 18 yrs or so i have been riding/wrenching;)

[Sjorge450R]

i will just talk to Rich Hetrick tomorow when i call to check the progress on my head.

[Honda TRX250ex]

i was talking to my friend that races dirtbikes and he was hanging around a team of quad racers and they just replaced the piston and he said all they did was put the bike up on stands start her up crack the throttle about every 5 mins for a hour