How much PSI is good compression on a cr250?


8 replies to this topic
  • wht02cr125r

Posted 11 April 2011 - 12:30 PM

#1

so i was wondering how much compression is considered to be a decent top end for a 02 cr250?

  • Blazinthetrails200

Posted 11 April 2011 - 12:33 PM

#2

150+ should be fine anything below that would be low

  • Third-Reef

Posted 11 April 2011 - 02:06 PM

#3

MY 97 had 180 cold with the old top end and stock piston. i just put in a prolite piston and i am getting 170 cold befor having run the bike. It wll be interisting to see what it is after i break it in and thry it warm.

  • Hairyyeti

Posted 11 April 2011 - 07:57 PM

#4

Why change it?

  • Third-Reef

Posted 11 April 2011 - 08:35 PM

#5

I have had my bike for 4 years and never touched the top end. If i was going to take it off, i was going to replace it. i measured the piston, and the diameter and ring grooves were right at the wear limits.

  • CRPilot

Posted 12 April 2011 - 09:30 AM

#6

I was at 195: Fresh piston and rings, cold, with base cut and head/squish set up for race fuel on an 02.

  • Third-Reef

Posted 12 April 2011 - 07:34 PM

#7

FYI on my 97 above where i got 170 with the new piston i checked and the squish was at .065". After i break it in and see how it runs i will pull the head and cut it for a squish of about .045 - .050 and then see ow that runs.

  • Third-Reef

Posted 15 April 2011 - 03:03 PM

#8

Update on the 97 with the new top end. After one heat cycle and with the motor still warm i got 190 PSI.

  • wht02cr125r

Posted 15 April 2011 - 05:56 PM

#9

ok so i checked my compression, it came to 195 cold, i havent tried it warm yet. the bike supposedly had less than 20 hours on it, but im just glad the top end is looking good.





Related Content

Forums
Photo

2006 CR 125 Tear Down Rebuild.. by J.Tomasello


Dirt Bike   Make / Model Specific   Honda   Honda 2-Stroke
  • Hot  37 replies
Forums
Photo

1995 rm80 by rohan1234


Dirt Bike   Make / Model Specific   Suzuki   Suzuki 2-Stroke
  • 0 replies
Forums
Photo

89CR250R - Stalls out when clutch is released (in first gear) by Rob_89


Dirt Bike   Make / Model Specific   Honda   Honda 2-Stroke
  • 2 replies
Forums
Photo

Value of a clean 1986 cr250 by ulmanb


Dirt Bike   Make / Model Specific   Honda   Honda 2-Stroke
  • Hot  46 replies
Forums
Photo

Another pwk thread, 05 cr125, YZ pwk by zotis777


Dirt Bike   Make / Model Specific   Honda   Honda 2-Stroke
  • Hot  32 replies
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

Register Close
If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.