1991-1993 Yamaha Exciter II-570 Service Manual, Page 359Get this manual
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_C_O_O_L_IN_G SV_S_T_E M INSPECTION 1 Inspect: Thermostatic valve Valve does not open at 50.055.0C (122131F) ReplaceInspection steps: Suspend thermostatic valve
Thermostatic valve is seal