willyh..

Member
May 23, 2019
1
0
hi im new to this and looking for some help not sure if im posting this in wright place
iv got a kx 125 was rideing fine then next day went to start it and it had no compression so I put new piston and ring in it but still the same can anyone help me as im new to the motocross this
thanks
 

Rich Rohrich

Moderator / BioHazard
LIFETIME SPONSOR
Jul 27, 1999
22,838
16,902
Chicago
When you say it has no compression did you actually measure the compression before and after you replaced the piston?
 

The Redrider

Member
Jun 14, 2019
238
32
If you have no compression, it sounds like something is severely worn. Your cylinder could be worn out, may be time for a replate for nic, re-sleeve for regular cylinders. You will have to match the piston to the new bore. Did you install your rebuilt piston correctly? Arrow to the front? Rings in correctly, wrist pin circlips locking correctly? Did you torque the cylinder base and head to specs? Spark plug installed correctly? Lots of factors, but rebuilding a single cylinder is very easy with the manual, you have a shop manual right? Hmmkay... 250px-VanDriessen.jpg
 

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