1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 108Get this manual
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FUEL SYSTEM
The high altitu de ca bu ret or adjustm ent is pe rfor med as follow s: Remov the ca rburetor (page 5-5) and float cham berReptace he stan dard main jet wit the hig altltude t