Need help quick - 07 WR450, air jet won't b ootom out

I'm installing the Yamaha jets that came with the bike. Includes a 110 air jet. Dirt Bike article says it goes in mouth of carb, where there is no jet currently. There are 2 holes there - 1 is a needle air jet - I removed the stock jet & tried putting the supplied air jet in there but won't thread in (this is the hole on the left as you are looking at the carb mouth - new air jet is bigger in diameter). apparently the right hole is for this air jet, and it threads in but does not bottom out & stop.

So, is the 110 air jet necessary? What does it do? What happens if I don't use it?

all help appreciated & thanks in advance.

I'm installing the Yamaha jets that came with the bike. Includes a 110 air jet. Dirt Bike article says it goes in mouth of carb, where there is no jet currently. There are 2 holes there - 1 is a needle air jet - I removed the stock jet & tried putting the supplied air jet in there but won't thread in (this is the hole on the left as you are looking at the carb mouth - new air jet is bigger in diameter). apparently the right hole is for this air jet, and it threads in but does not bottom out & stop.

So, is the 110 air jet necessary? What does it do? What happens if I don't use it?

all help appreciated & thanks in advance.

If this is the GYTR AIS kit then I believe there is a recall on the AIS kit because of the very problem you noted. Contact your Yamaha dealer for the correct size jet.

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