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[hdbrad03]

FRom what I recall reeading elsewhere here there are instances of new jugs with rust in the bores. (SE, out of box)

Take a BRAND NEW bike, and run the piss out of it with ZERO miles on it... then tell the buyer to follow certain break in guidelines... yup.. thats real good..

Gotta seat the rings someway.

 


   Brad

[spydglide]

Gotta seat the rings someway.

 


   Brad

And once I watched that guy at the end of the assembly line finish running it up thru the gears a few times, I thought that's exactly  one reason to do it that way.  spyder

[2018_FLTRXSE]

it should be part throttle on, then close the throttle completely and let it decel. increase the amount of throttle applied and decel again until you can make a full throttle pull... then the rings should be close to seated... at least thats what I do on my hot-rodded SBC's...

[Half_Crazy]

it should be part throttle on, then close the throttle completely and let it decel. increase the amount of throttle applied and decel again until you can make a full throttle pull... then the rings should be close to seated... at least thats what I do on my hot-rodded SBC's...

Break-in will be highly dependent on materials of the cylinders and rings. If the jugs are nikasil you can break it in by running it hard, but if the bores are ductile iron you'll scorch them up by doing that. If you spend the money for the ductile iron liners (an $800 option at R&R Cycles) a careful break-in is in order.

You can really notice the difference at the drag races. After 4 back-to-back passes in the heat the bikes with Nikasil jugs are slowing down/losing power. The bikes with properly broken in ductile iron bores run the same on the 6th pass as the first.