Low compression?

Was running the track and my 2010 450 just quit. My compression tester said 0. New pistions rings and valves adjusted. Still reads 0 used my neighbors tester reads 30 psi. It won't run. What's my next step? Any ideas?

Is there a compression release type start assist on your 450 ? Gonna learn today!

Its an auto decompress. The older ones have a lever.

No CRF450 ever had a decompression lever. I recommend getting a leak down tester and finding out where all your compression is going.

Yeah my Yami 426 does but this Honda doesn't anyone had issues with the decompresser not compressing?

Are you sure the valves are in spec? Could be a valve stuck open or bent. Is the decompression weight operating normally. It will take a while for the rings to seat on a new piston, but it wont cause zero compression. A leak down tester will help diagnose it.

Edited by nzgsr

Yeah my Yami 426 does but this Honda doesn't anyone had issues with the decompresser not compressing?

Even if the decompression mechanism was stuck, the bike would still start. It would just run very bad and probably stall out after starting.

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