Hard Starting Hot Engine (Aisan)

Thermostatic Valve

Thermostatic valve not operating at high ambient temperature (this prevents cool air from flowing through main body and flange into intake manifold to cool fuel-air mixture and inhibit fuel evaporation)

Aisan Carburetor Thermostatic Valve

As the valve opens, it allows outside air to flow directly into the intake manifold, leaning out the rich air fuel mixture. Valve starts to open when engine compartment temperature reaches 140 F, or 60 C and fully opens at 167 F, 75C.

Choke unloader misadjusted

Carburetor float adjusted wrong

Aisan Float Adjustment
Aisan Rebuild


Updated on 04/27/2022

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