Join Date: Feb 2009
Location: High Ridge, outside St. Louis, MO
the problem with the 06 and older bikes was lack of lubrication to the wrist pin (the thing that holds the piston to the connecting rod). 07 and new have a little "nozzle" that squirts oil at the bottom of the piston, where the 06 and olders do not, and rely on the crank and vobration to kick up oil to lube the wrist pin, which usually happens sufficiently. for about $200 you can have the "oil mod" done to your 06 or older to have the exact same effect as the 07 and newers do. hope that answered everything.
2007 YFZ450 Red/Gray - DMC Afterburner Comp full system - Pro Design Pro Flow intake and air filter - CP 12.75:1 piston - port work by Outlaw Innovations - Stage 2 HotCams - EHS Racing airbox lid - AC racing blackline nerfs - TAG metals black bumper - bent accelerator pump spring - Adjustable Fuel screw - Maxxis RAZRs all around - 15/38 gears