Without these insulating blocks there is the problem that the carburetor temperature will rise after shutting down the engine. Your wish to start the engine a few minutes after shutdown will not be possible, as the petrol entering the hot pump chamber and associated passages will vaporize. These insulators are CNC milled and bored for use with the intake bends.
Technical Dimensions
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SETUP GUIDE by DR.G
DR.G's GUIDE TO CARBURETOR BUTTERFLY TRAVEL, THROTTLE SERVO SPEED, ADJUSTING THE CARBURETOR NEEDLES