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Discussion Starter · #1 ·
I recently rebuilt a 2001 Yamaha YZ125 and I continue to get a lack of compression and the bike will not start. I have replace the piston and ring with OEM parts. The bike had a different crankshaft and did not take the OEM top connecting rod bearing. I wonder if the connecting rod is too short and not allowing for a full stroke therefore giving me a lack of compression

Any suggestions would be helpful
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