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I just got done a HPP cyl conversion and 144 Big bore kit on my 02 CR125. Wanted to verify power valve operation after swaping the governor and linkage. Pretty cool to see the power valve operate. Enjoy
Millennium did the big bore. Pretty pleased with how it came out. Had it set up for 100oct fuel mid-top porting. They spec’d a .040 squish and it was .041”. Not to shabby.


2010 crf450
2002 cr125
1993 Yamaha waveblaster
1993 Kawasaki 750sx