I just bought a complete top end for a 98 Yamaha XL 1200 from SBT. And after 5 hours of running it under 30 mph I checked the compression and it was 70- 75 -80 psi on the three cylinders. What could have happened? My oil mixture was 4.oz to 1 gallon. This was tested on a new compression gauge. Never rev it more than 6000 rpm, I also let it cool down after every 1/2 an hour to break in. I am an ase master automotive mechanic. I really baby the break in procedure, I know that it takes 8 gallons to break it in, I've only used 7 gallons and my compression is low.
Could I be using to much oil? And is that why the rings may not be sealing right?
Could I be using to much oil? And is that why the rings may not be sealing right?
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