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'63 Bonneville heat riser thermostat spring

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11-09-2025, 09:16 PM

Goatracer1 Goatracer1 is offline

Goatracer1 is offline

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Join Date: Oct 2003

Location: NH

Posts: 4,265

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Correct. The spring closes the valve. Exhaust pressure opens it. When the spring gets hot the valve could sit any place though not fully closed.

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