2006 YZ 250f Valve Job and Top End Rebuild

I just picked up this bike on Friday.  It is an 06 YZ250f 50th anniversary edition.  Its mostly stock, with the exception of some black excel wheels.  It has a valve problem where the intake valves wore so thin that they chipped off. causing a loss of compression.
Upon doing some research, I found out that Yamaha recalled all 2006 YZ250f’s and replaced the intake valves, so I am going to give my local dealer a call and see if there is any chance of getting this work done for free before I spend my own money.
The scope of work for this bike will include new top end gaskets, piston, rings, intake valves, exhaust valves, and a new timing chain.
Here are some shots of the bike itself before doing any work.
I bought this bike with the top end already disassembled, which I prefer not to do since there are usually missing parts when it comes time for re-assembly, but the previous owner convinced me he had everything, and as nice as this bike looks, I just couldn’t pass it up.
50th Anniversary hurricane graphic kit.
Here is a side by side of a good cylinder and a bad one.  The one on the left is from an 02 250f and the 06 is on the right.  Its amazing how the entire 250f motor has had only minimal changes since its introduction in 2001.
The head seems to be in great shape.
Here is the bad valve.  Notice the 2 chips in the edges.
Old tired piston
There are some slight scuffs in the skirt.
Thats all I can do for now.  I’ll be calling the dealer to inquire about the recall tomorrow, then I’ll make my parts order and I’ll post back once I have them.  Check back soon for updates.

I just picked up this bike on Friday.  It is an 06 YZ250f 50th anniversary edition.  Its mostly stock, with the exception of some black excel wheels.  It has a valve problem where the intake valves wore so thin that they chipped off. causing a loss of compression.

Upon doing some research, I found out that Yamaha recalled all 2006 YZ250f’s and replaced the intake valves, so I am going to give my local dealer a call and see if there is any chance of getting this work done for free before I spend my own money.

The scope of work for this bike will include new top end gaskets, piston, rings, intake valves, exhaust valves, and a new timing chain.

Here are some shots of the bike itself before doing any work.

I bought this bike with the top end already disassembled, which I prefer not to do since there are usually missing parts when it comes time for re-assembly, but the previous owner convinced me he had everything, and as nice as this bike looks, I just couldn’t pass it up.

50th Anniversary hurricane graphic kit.

Here is a side by side of a good cylinder and a bad one.  The one on the left is from an 02 250f and the 06 is on the right.  Its amazing how the entire 250f motor has had only minimal changes since its introduction in 2001.

The head seems to be in great shape.

Here is the bad valve.  Notice the 2 chips in the edges.

Old tired piston

There are some slight scuffs in the skirt.

Thats all I can do for now.  I’ll be calling the dealer to inquire about the recall tomorrow, then I’ll make my parts order and I’ll post back once I have them.  Check back soon for updates.

Author: joedean

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