Jetting a 2-stroke carb (Keihin PWK)

Skip, what about altitude? How do you know which jet size you need, which needle clip, pilot, and jet will I need? Im in Vancouver, BC. Dont know which measurement I need? but I am 4m or 14ft above sea level???  
<a href="http://s61.photobucket.com/albums/h50/DamianJ_2006/?action=view¤t=Dirtbike004.jpg" target="_blank"><img src="http://i61.photobucket.com/albums/h50/DamianJ_2006/Dirtbike004.jpg" border="0" alt="DB 2"></a>
One BOOOTTYYFULL Biycle I die to ride each time

By your name I am assuming you have a YZ85?  
Use the stock 138 main jet, and the stock needle in the stock position.  Use the stock pilot jet as well.  The only thing you need to change is the spark plug - your bike shipped with the BR10EG, but you are better off with the BR9EG (it will foul less).  Run 40:1 premix ratio and the bike will run like a chanp at your altitude!  
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Here we go again!

Skip, this is a great effort. I don't know how i missed this.? .
U know I've never tried  2 pull a low speed through the drain plug. Always dropped the bowl.

1 thing u should stress is how soft these jets are and to be extra careful when installing them especially the main.  years ago i snapped one trail side and it took me about an hour to get it out, not to mention that it was the one i wanted in there and didn't have a 2nd.  

Absolutely correct!  Theye are soft brass, so no need to torque them down.  Finger tight and just a smidge with the screwdriver or socket wrench is all they need!

I usually don't have to drop the bowl, but some carbs you have to in order to get the pilot out..  
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Here we go again!

And when you drop it, step on it by accedent and then spray with break cleaner and install...No worries if you have a YZ! not that i know.......  
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DIABETES SUX!

Yes!! Always step on it first!! lol  

Woot. Sweet, all I gotta do is clean them. Please answer my other post on how to clean the jets.. rinse w/ cloth? or soak in tub?? or what. I got a BRG9ES plug b/c G was out.  
<a href="http://s61.photobucket.com/albums/h50/DamianJ_2006/?action=view¤t=Dirtbike004.jpg" target="_blank"><img src="http://i61.photobucket.com/albums/h50/DamianJ_2006/Dirtbike004.jpg" border="0" alt="DB 2"></a>
One BOOOTTYYFULL Biycle I die to ride each time

i know this is an old thread, but thnx for the in depth post Skip...will be using this post tonight to take apart & clean my carb. im also replacing the needle and pilot.....great post!  

very very helpful