OEM or Aftermarket valves and piston?
Posted 14 June 2012 - 06:30 AM
Posted 17 June 2012 - 12:36 PM
If your bike were a 10 or newer I would recommend OEM valves and most engine builders I've talked with seem to agree.
Since yours is a 06 I assume its no longer a cutting edge race bike, in which case I would recommend aftermarket SS.
Posted 17 June 2012 - 10:54 PM
Posted 28 June 2012 - 02:27 AM
I have tested this myself.. I had some OEM valves coated with chromium nitride CrN. Running on copper seats, they did 100hrs and never once shifted clearances... perfectly reliable..
The difficulty, is stripping the crappy OEM coating back to bare titanium.. Trying to chemically remove it, leaves the chances of pitting the surface.. some were useable, so not so.. I had to polish the stems with diamond polishing paste..
heres a pic
Posted 29 June 2012 - 08:02 AM
OEM valves (intake) are titanium. Generally aftermarket valves are stainless steel - which last longer but are heavier which require stiffer valve springs.