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what is this part please

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ive just bought a new drz and in the parts box that came with it there was jet, snorkel, (evidence of tuning) and also this part which im wondering - what is it and should it be removed from bike please?

 

Thanks

 

part

 

get-attachment_zps67e073a8.jpg

 

bike

 

temporary_zps6c7ce90c.jpg

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That looks like a PAIR valve. Adds clean air to the exhaust to after-burn hydrocarbons in the exhaust.  Often removed.  US/Canadian models do not come with it.  No affect on performance one way or the other.  May promote popping in the exhaust when active.

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thanks - although that link states it stops most of the popping on decelleration!!!

 

Woah - why would anyone remove for that reason!!

 

Am i right in thinking this puts air into the exhaust to burn off more gasses?

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Wiscon- Yup PAIR valve.  Solenoid valve is a different system that restricts carb vacuum slide height in the lower gears to limit power.

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