Look at my piston

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NickInOhio

Member

Jun 1, 2002

24

0

• Jul 28, 2002

• #1

Can anyone offer advice on this YZ125 piston? This is my first tear down (I inherited the bike a couple months ago).

Go to my website:

http://www.klase.com/DRN

Thanks,
Nick

 

M

Moto Squid

~SPONSOR~

Jul 22, 2002

853

0

• Jul 28, 2002

• #2

That piston looks really good actually. The light brown on the bottom of the crown indicates the jetting was good. Not much carbon on the crown is also good. Only thing I can't see is if there is any scuffing. Wish my piston could've looked like that

 

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NickInOhio

Member

Jun 1, 2002

24

0

• Jul 28, 2002

• Thread starter
• #3

Moto-squid,
Two questions - #1 - Where should I look for scuffing? And what will this tell me?

#2 - When you talk about the light brown under the crown, are you talking about the inside view of the piston? What do you look for here?

Thanks,

 

F

fatty_k

~SPONSOR~

Jul 3, 2001

1,274

0

• Jul 28, 2002

• #4

http://www.ericgorr.com/twostktech/pistondiaguide_2t.html

This might help you.

 

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NickInOhio

Member

Jun 1, 2002

24

0

• Jul 29, 2002

• Thread starter
• #5

I have no idea how many hours are on this piston/ring. How often should they be changed during race season? And can you just replace the piston/ring, or do you need to service the cylinder to accomodate the wear?

 

Rooster

Today's Tom Sawyer

Damn Yankees

LIFETIME SPONSOR

Aug 24, 2000

3,292

1

• Jul 29, 2002

• #6

You will get all kinds of replies on how often you should replace piston/rings, etc. I go by the compression method. I don't ride my bike real hard, so my intervals are sometimes less than once a year. I have a '00 250 that still has the original piston and rings in it! Compression is still within specs too!