2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 176Get this manual
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COOLING SYSTEM
SPECIFICATIONS
2.6 liters (2.1 US qt1.8 Imp 'Ii) 0.46 liter (0.49 US ct, 0.40 Imp qt) 108 137 kPa (1.1 1.4 kgfcm, 16 20 psi) 80 84C
8 mrn (0.3 in) minimum Pro Honda HP