Posted by dlevy on March 20, 2007, 4:01 pm
I rebuilt and proceded to blow up my YZ 250. I'm in the process of trying
again.
The owners manual states that there should be a letter stamped on the rear
of the cylinder. THERE IS NO LETTER STAMPED ON THE REAR OF THE CYLINDER.
There is an upside down 7. It is supposed to be either A,B,C, or D. The
upside down 7 looks like an upside down 7, not like a partially stamped
letter.
Does anyone know the real scoop on this? This is the stock cylinder. I
explained to the parts guy last time I bought a piston that there was no
letter stamped. Of course, he really didn't care. Apparently, it is
important to match the piston and cylinder.
Thanks.
Posted by dirtbike483 on March 20, 2007, 9:21 pm
> The owners manual states that there should be a letter stamped on the rear
> of the cylinder.
Not that this will be of much help to ya,but my 02 yz-250 code letter
was on the back cylinder written in a black ink.
Needless to say it is no longer there. I did not notice a stamp, But
could check tomorrow.
Cliff
Posted by Rider on March 20, 2007, 10:38 pm
there should be a letter stamped on the rear
> of the cylinder. THERE IS NO LETTER STAMPED ON THE REAR OF THE CYLINDER.
> There is an upside down 7. It is supposed to be either A,B,C, or D. The
> upside down 7 looks like an upside down 7, not like a partially stamped
> letter.
Are you sure that "upside-down 7" is not a partially stamped arrow? The
arrow should point at the exhaust port when installed.
Posted by Mike Baxter on March 20, 2007, 10:50 pm
wrote:
>there should be a letter stamped on the rear
>> of the cylinder. THERE IS NO LETTER STAMPED ON THE REAR OF THE CYLINDER.
>> There is an upside down 7. It is supposed to be either A,B,C, or D. The
>> upside down 7 looks like an upside down 7, not like a partially stamped
>> letter.
>Are you sure that "upside-down 7" is not a partially stamped arrow? The
>arrow should point at the exhaust port when installed.
We are talking cylinder stampings that let you know which piston to
buy.
The answer is to take the cylinder in to be measured and the purchase
the appropriate piston. Check you local speed shop.
Mike Baxter
Posted by CrashTestDummy on March 20, 2007, 11:29 pm
On Tue, 20 Mar 2007 19:50:48 -0700, Mike Baxter
>wrote:
>>
>>there should be a letter stamped on the rear
>>> of the cylinder. THERE IS NO LETTER STAMPED ON THE REAR OF THE CYLINDER.
>>> There is an upside down 7. It is supposed to be either A,B,C, or D. The
>>> upside down 7 looks like an upside down 7, not like a partially stamped
>>> letter.
>>
>>Are you sure that "upside-down 7" is not a partially stamped arrow? The
>>arrow should point at the exhaust port when installed.
>>
>We are talking cylinder stampings that let you know which piston to
>buy.
>The answer is to take the cylinder in to be measured and the purchase
>the appropriate piston. Check you local speed shop.
>Mike Baxter
Maybe someone brazed it off? ;-p
Fred Bradford - CrashTestDummy
f.j.bradfordREMOVE@verizon.net
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> of the cylinder.