2007 yz450f issues?

YamaLink wrote:

From http://racerxonline.com/2006/09/28/racer-x-tested-2007-yz450f ....new clutch, a revised cam-shaft lift angle and overlap, a new exhaust system, wave-disk brake rotors, new Pro-Taper handlebars, a new radiator with bracing...

From http://racerxonline.com/2006/09/28/racer-x-tested-2007-yz450f

....new clutch, a revised cam-shaft lift angle and overlap, a new exhaust system, wave-disk brake rotors, new Pro-Taper handlebars, a new radiator with bracing, new radiator louvers, new forged top, bottom and handlebar clamps, new seat-cushion design, and a longer rear shock. The changes to the engine and exhaust were aimed at improving the power characteristic of the motor and also meeting the new AMA sound requirements. More on that later.

The new brake rotors are lighter and, combined with a lighter chain guide, help to reduce the unsprung weight of the bike. The new clamps are forged to reduce flex; the seat foam is lighter to reduce weight; the rear shock is longer to improve the rider characteristic; the major bolts on the bike have all been changed to 10mm for easier maintenance; and the suspension clickers have also been changed from brass to aluminum for lighter weight and increased strength.

MotoX85 wrote:

I owned a 2007 450 for 4 years. With constant air filter changes, usually every or every other ride and oil changes usually before they were...

I owned a 2007 450 for 4 years. With constant air filter changes, usually every or every other ride and oil changes usually before they were due here is what I encountered:

I raced the bike for a good 2 years, Vet A/B and then just rode practices after my son started racing

Never adjusted the valves, checked them every 6 months and they never came out of spec. never
Replaced the clutch, once. And this was after letting a 20 yr old (friends kid) borrow my bike for a few days.
I checked compression every 6 months also and after 3 years it had only lost about 5-10 lbs.
I bought a full FMF exhaust for it and the gains where very impressive, I recommend strongly
I finally replaced the topend in 2011 about a month before I sold it to buy my son a new bike and the cylinder looked like it was a couple months old, still had the honing scratches, simply amazing.

Thats it, I never had a problem at all. I love me some 2 strokes, just bought my son a new 250 2t but using a Yamaha as comparison as 4 strokes are more expensive is not gonna cut it. A good 450 is a fat boy vet riders dream and if reliabilty is your #1 concern, nothing beats a Yamaha.

With constant and coinsistent maintenance, the 07 450 will last forever with little to no parts replacement.