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Discussion Starter · #1 ·
When you open the airbox there are 4 large valves in the rear of the airbox that draw air into the engine. What are these called and should they be open or closed when the bike is shut off?
 

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rotaredom
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own stupidity how? if you just stuck your finger in to see them open then try releasing it from the left side by where the idle adjustments are located "if you know where that is" or just turn the key on, then back off. that should put it back to the normal position.
 

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Discussion Starter · #7 ·
yeah I just stuck my finger in there. Its funny, as a child, a teenager and now as an adult all my troubles have come from "just sticking my finger in there".
 

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Those are the secondary butterflies, not the main throttle valves, which are deeper in the throttle bodies. They act to restrict airflow at low throttle/engine speeds to improve idle and low end torque. The main throttle valves are directly actuated by the throttle. The secondaries are controlled by the ECU.
 

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you could close it with your finger and it will open up by itself when you turn on your bike. i was curious too and when i turned my bike on they opened back up
 

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Discussion Starter · #14 ·
you could close it with your finger and it will open up by itself when you turn on your bike. i was curious too and when i turned my bike on they opened back up
Yeah I spent an hour trying to figure out why they would open but not close after I turned the key off. Then i took the bike around the block and opened the box back up and they were closed again. I can't figure out how they work but I'll just assume they do.
 
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