2009 YZ450F common problems, issues, weaknesses?

I just picked up a 2009 YZ450F and thought I would see if they are known to have any particular problems, about all bikes have one or two so I figured this would be the place to find out.

 

I did a couple searches to find common problems, but didn't see anything and I also looked thru the FAQs for 2009 specific stuff, didn't see anything major there either.

 

I don't have any problems with the bike, runs fine and strong, just wanted to see if there is anything I need to check out before I start racing it this year.

 

Thanks

cam chain stretches , replace annually

Well that should be easy enough to hear when going bad, will get louder generally

 

Does a manual cam chain tensioner help any or needed?  I know several dirtbikes benefit from one, DRZ400 in particular

 

Like I said I don't have any issues with mine, just wanted to see if there is anything I should look for or be aware to watch for

 

It RIPS, has more power than anyone ever really needs. The previous owner loaded it up with aftermarket pices; wheels with red hubs, GYTR exhaust, 1 1/8 fatbar, ASV levers, aftermarket rotors, aluminum rear rotor guard, Boysen clutch cover, billet aluminum magnetic oil cover and a bunch of billet aluminm engine plugs and covers. Obviously it was his baby because whoever sunk some $$$ into it in aftermarket pieces.

Edited by dirtdude723

Definitely make sure the free piston has either the hole drilled in them or replaced with the aluminum ones.

I smashed 4 of them before I found out the remedy for it.

Also mine did not like straight av gas ,stalling ,hard to start ,real finiky.

half 93 pump gas half 100LL works best.

Pretty short list. I like the sound of that.

My personal preferences are swap the '09 CDI ignition box for either a 2006 one or for even more aggressive bottom end go to the 2003 ignition box. Either are good upgrades and helps with low end throttle response. I'm also a big fan of the 9 oz GYRT. Helps minimize slow speed stalling and helps smooth out the power. 2nd on the free piston mod. Broke mine and replaced with aluminum ones. Mucho better. Definitely check the valves before you ride it too much, just in case.... Sterring stem bearing have a tendency to wear pre-maturely also. Cam chain is like $25 bucks and huge piece of mind. Don't wait for it to stretch and jump time = expensive. Other than that these bikes are awesome and almost bullet proof. I also swapped the OEM throttle tube for a quick turn one. Easier to ride, for me at least.

My personal preferences are swap the '09 CDI ignition box for either a 2006 one or for even more aggressive bottom end go to the 2003 ignition box. Either are good upgrades and helps with low end throttle response. I'm also a big fan of the 9 oz GYRT. Helps minimize slow speed stalling and helps smooth out the power. 2nd on the free piston mod. Broke mine and replaced with aluminum ones. Mucho better. Definitely check the valves before you ride it too much, just in case.... Sterring stem bearing have a tendency to wear pre-maturely also. Cam chain is like $25 bucks and huge piece of mind. Don't wait for it to stretch and jump time = expensive. Other than that these bikes are awesome and almost bullet proof. I also swapped the OEM throttle tube for a quick turn one. Easier to ride, for me at least.

May be a stupid question but what " free piston" and "aluminum ones" are you guys talking about?

May be a stupid question but what " free piston" and "aluminum ones" are you guys talking about?

it's a part inside your forks that are made of plastic and tend to break if fork oil gets past them.

 

I just googled it, "free piston mod yz450"

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now