1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 138Get this manual
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CYLINDER HEADCVLlNDERPISTON Install the va lve cotters lusing the specia toot as VALVE SPRING COMPRESSOR
Support the cylinder head above the work be'n'Ch surface to prev.entpo'ssJble vaJvl'! dam