2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 137Get this manual
FUEL SYSTEM ('04'05) Check the hot start valve face for scores, scratches or wearCheck the seal ring for deterioration, wear or damageReplace the hot start valve set if necessary
Install the hot start valve into the carburetor and tighten the valve nutTORQUE: (0.3 kgf-m, 2.2 Ibfft) Install the rubber cap onto the hot start valve nut properly