Thermostat or not on full race engine? (660) - Yamaha Raptor Forum
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post #1 of 3 (permalink) Old 10-19-2006, 11:49 PM Thread Starter
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Thermostat or not on full race engine? (660)

I have a full race engine, 686 CP12.5 Piston, Custom head, Custom cams, Custom fuel injection.( 2x 45mm Throttlebodies)

Wwhat is the pros and cons of taking the thermostat out?
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post #2 of 3 (permalink) Old 10-22-2006, 05:47 PM
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Re: Thermostat or not on full race engine? (660)

Keep the thermostat. It holds the coolant in the radiator a little longer, so you get a little less flow, but the incoming coolant is cooler.
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post #3 of 3 (permalink) Old 10-29-2006, 04:44 PM
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Re: Thermostat or not on full race engine? (660)

Pro: immeasureable power increase from drop in resistance

Con: difficulty getting bike up to operating temperatures and the resulting damage that ensues from running her WO when cold.


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