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Erik Marquez

Never owned BLUE before in a dirt bike..

6 posts in this topic

So, not really up on Blue dirt bikes.. Know what I've read in old reviews, know what I've seen in this forum. But dont know what I dont know.

Looking at a 2006 YZ450F tomorrow..

Any systemic issues with this MY YZ450F?

To be used as a MX bike..., will have suspension set up for the intended rider.

What other know "have to's" for this bike?

Any Super picky maintenance issues? re occurring or one time reliability fix's?

Why should I not buy a 2006 YZ450F? (other then that means you'll have yet another MOD hanging around in this forum :banana:)

Thanks in advance.

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I can't think of a reason not to, but rebuilding the head is expensive. Whether it needs it or not depends on a lot of things. Quiz him on how often he has checked the valve clearance, and how many times (if any) it has needed to be adjusted. If any one valve has needed to be shimmed more than one shim size smaller, politely tell him you have two more to look at before you buy.

The only thing you could really call a systemic flaw was that some of these had a tendency to develop kinks in the cam chain, which leads to slipping time and some amount of damage the the aforementioned expensive head. Apart from opening things up, there is no way to look for this preemptively, so just figure to replace it as soon as you get it home unless he tells you he just did. Under $75 with a new tensioner.

See what the head bearings feel like. If they are stiff and notchy, the top bearing may be rusted. The seal doesn't work so well, and if you wash it hard, you have to regrease them all the time or use the upgraded bearing from Yamaha.

If you can, run it out in the top three gears and be sure it holds in gear under a load.

Look under the chain slider. Some wear is pretty typical, a lot is not good. Read:

http://members.cox.net/oldernyzer/wearplate.htm

These posts apply to an '06 in particular:

http://www.thumpertalk.com/forum/showthread.php?p=4922391#post4922391

http://www.thumpertalk.com/forum/showthread.php?t=575367

http://www.thumpertalk.com/forum/showthread.php?t=634724

And, you'll want one of these if he doesn't give you one:

http://www.yamaha-motor.eu/eu/services/owner-manuals/index.aspx

:banana:

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I can't think of a reason not to, but rebuilding the head is expensive. Whether it needs it or not depends on a lot of things. Quiz him on how often he has checked the valve clearance, and how many times (if any) it has needed to be adjusted. If any one valve has needed to be shimmed more than one shim size smaller, politely tell him you have two more to look at before you buy.

The only thing you could really call a systemic flaw was that some of these had a tendency to develop kinks in the cam chain, which leads to slipping time and some amount of damage the the aforementioned expensive head. Apart from opening things up, there is no way to look for this preemptively, so just figure to replace it as soon as you get it home unless he tells you he just did. Under $75 with a new tensioner.

Owner (TT Member, and forum reader) stated valves were just checked and in spec.

See what the head bearings feel like. If they are stiff and notchy, the top bearing may be rusted. The seal doesn't work so well, and if you wash it hard, you have to regrease them all the time or use the upgraded bearing from Yamaha.

Replaced with pivot works tapered roller bearings recently

If you can, run it out in the top three gears and be sure it holds in gear under a load.

Offered to let me ride it when I come to look, so should not be an issue to see.

Look under the chain slider. Some wear is pretty typical, a lot is not good. Read:

http://members.cox.net/oldernyzer/wearplate.htm

I'll have look

I have a good feeling on this one, seems to be a low hour, adult owned, maintained bike.:banana:

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I have a good feeling on this one, seems to be a low hour, adult owned, maintained bike.:banana:

In that case, it should be a great bike.

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Well it's a done deal.... It followed us home.

attachment.php?attachmentid=14087&stc=1&d=1281923390

Truck had hardly stopped when the boy jumped out and started unloading :eek:

attachment.php?attachmentid=14088&stc=1&d=1281923390

Rode for an hour......till dark.... Bike is in the garage on the lift... My bet is it will be detail disassembled in less then 2 hours.:banana:

Yup..... He's my boy... Love this kid..

new bike.jpg

cody new bike.jpg

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:eek: And it begins..

1 hour of riding, 1 hour of tear down.. And,, first repair required..

Seems the shock has a seal leak.

attachment.php?attachmentid=14090&stc=1&d=1281929965

attachment.php?attachmentid=14089&stc=1&d=1281929965

Charged it up with 175PSI Nitrogen.. We'll see what it is in the morning..

All to be expected on a used bike years old.... We were going to service the shock anyway :banana: Guess I need to order a seal head as well.

Leaking shock.jpg

shock.jpg

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