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Hello everyone,,
I just wanted to give others a heads up. I have the Koso 170cc kit with 4V head, 34mm throttle body, PCX150 injector and PCV w/ wideband2. I have been having problems with getting it to tune and last night I found the Idle air screw missing from the throttle body. It backed out at some point, not sure when. I spoke to a friend and he checked and found his missing too. I recommend anyone that's using that throttle body check that screw.
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I spoke to Koso and they said they have not heard of it before. If you find the same problem please let them know too. If others are having the same issue it will be easier for us to get the replacement parts.
 

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You spoke to Koso? Like a distributor or?


"If you've purchased a KOSO Throttle Body, you might have noticed that there is no air screw"
 

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Just realized above post is spam, copy of another old post.
 
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