YYZ250

Member
Aug 31, 2006
12
0
Hello,

Can anyone tell me what the compression should be for a 2001 YZ125? Also, any tips on replacing the top end?

thanks in advanced.....
 

burgunder

Member
Oct 3, 2006
40
0
Not sure if it is the same because I have an 05 but mine was 165psi just after break-in on the new bike. Hope this helps. And most say to replace the top end after a 10-12% drop.
 

kawicam250

I bleed green!
Member
Aug 7, 2006
1,162
0
burgunder said:
Not sure if it is the same because I have an 05 but mine was 165psi just after break-in on the new bike. Hope this helps. And most say to replace the top end after a 10-12% drop.




thats probably because the engine was almost brand new, my 00' KX125 has about 96 PSI when i replaced the top end. so i wouldnt worry if you have more than 110-115 PSI :nod: .
 

84cr125

Member
Apr 8, 2007
292
0
kawicam250 said:
thats probably because the engine was almost brand new, my 00' KX125 has about 96 PSI when i replaced the top end. so i wouldnt worry if you have more than 110-115 PSI :nod: .

i dont think it matters if the engine was new......
i have a 1984 cr125 and after a new top end i get 180PSI.

You should be getting around 160PSI to 180PSI for a good running top end. if you have anything lower than 130PSI its most likely time for a new topend.
 

kx125412

Member
Mar 30, 2006
341
0
96 PSI is quite low. My old RM125 put out 165 PSI it should be in that range. Do a search too on this subject youll find lots of info.
 
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