On the ferrea website they have spings and valves for the CRF450R, but only for the years 2002-2004. I've been told that they will work with a 2006. My question is are the ferrea springs fine? I've heard good things about the valves. Here are the part numbers I am looking at.
F0248 I 36mm 5.49mm 84.6mm 1.15mm
20° Flo. Dish Head. Stock size. Black Nitride
F0227 E 31mm 4.965mm 84.25mm 1.15mm 19° Flo. Dish Head. Stock size. Black Nitride
S10085 Single Spring 21.50 mm 15.10 mm 75 lbs 155 lbs 203 lbs 25 mm 10 mm Special Alloy @37 mm @ 27 mm Endurance Application
Is there anything wrong with this in a 2006 head I'm rebuilding? I will use OEM springs for the exhaust. Also can I use OEM retainers etc on the intakes? Ferrea calls for titanium retainers and stuff.
I've found a couple sites selling this by searching for part numbers. Thanks