xr600 idel problems

I installed a pro circuit exhaust on my 1998 xr600.It wont idel now?Do i need to change jetting or what.It's grate except for the idel .And if so what jets and how big should i go?

You might need to go richer. I have a 68 pilot and it works great. Makes for much easier starting than the stock pilot. You should up the main jet too. I run a 158 in mine. I go smaller if I am headed for altitudes over 7000 feet.

Check you valve clearance. If it gets to zero it will make the bike not idle.

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