New(er) bike, more problems

K

kx125412

Member

Mar 30, 2006

341

0

• Apr 9, 2007

• #1

I pulled the pipe off my bike today to see what kind of shape the cylinder was in and it wasnt pretty. On the left side of the cyliner theres a big scuff mark that looks like it runs all the way up to the head and on the right side of the piston looks like a lot of blow by and metal chunks that have been squished onto the piston. The bike has tons of compressin whiched surprised me when I saw the damage. Take a look at the pics and tell me what you think

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Last edited: Apr 9, 2007

K

kx125412

Member

Mar 30, 2006

341

0

• Apr 9, 2007

• Thread starter
• #2

I looked at it again and it almost looks like it seized up at one point but its weird that it only did it on opposite sides, not just one spot or a 4-point seizure. No one has any ideas? I think I might just gonna run it as it is seeing how its going to need a replate anyways and then replace everything this winter.

 

M

mandark1967

Member

Mar 12, 2007

246

0

• Apr 9, 2007

• #3

Replating now is cheaper than replacing con rod and other parts when the piston breaks, and scatters its parts into your lower end.

 

whenfoxforks-ruled

Old MX Racer

~SPONSOR~

Oct 19, 2006

8,129

2

Merrillville,Indiana

• Apr 9, 2007

• #4

Seize marks,blow by,3 hours of hard riding it will be dead....

 

K

kx125412

Member

Mar 30, 2006

341

0

• Apr 9, 2007

• Thread starter
• #5

Its just not adding up though. It starts first kick and runs great and has tons of compression. I'm wondering if the idiot who had it before me replaced the rings only and didnt do the piston.

 

7

76GMC1500

Uhhh...

Oct 19, 2006

2,142

1

• Apr 10, 2007

• #6

I would do a piston change at the least. The previous owner probably re-ringed it, which is why it makes good compression, but never replaced the piston. That scuffing on the cylinder may be superficial. If there isn't any gouging, you may be ok to reinstall a new piston and run the bike until it burns that one out. If the bike makes good compression and has acceptable blow-by, there shouldn't be too much of a problem. Your cylinder looks almost new otherwise, that's a lot of cross-hatching for a worn out cylinder.

 

1

1BAD250

Member

Nov 21, 2006

72

0

• Apr 10, 2007

• #7

ya, my idvice is just tear it down & do it now youl save in the long run. :nod:

 

2

2smokers

Member

Mar 25, 2006

106

0

• Apr 10, 2007

• #8

yes

 

8

84cr125

Member

Apr 8, 2007

292

0

• Apr 10, 2007

• #9

the scrates dont look that deep, replace the piston and rings and you could get a little more out of it.