Im rebuilding a carb for a friend and im ok up until I saw that the needle the the carb had in it. the one in the carb had more slots in it then the stock oem rebuild kit came with. im wanting to put the oem in so what setting do I use. here is a picture of the two neddles.. new oem one look gold. thanks for any help

 

Is it my eyes, or is the gold one tapered a lot sharper? that will greatly affect jetting and throttle response, you would think a carb kit would have the same needle in it. Is this a stock Yamaha kit, or an aftermarket performance kit, like a Dyno jet?

 

it's a Moose oem kit. Not sure about the needle. I guess I can just use whats already in the carb. do you know how far out I turn the air/fuel screw, some say 2.5 and some say more?? thanks..

 

2.5 is a good starting point, the way to tell if your mixture needs tweaking is to run in low gear up to speed, then let off and coast, if it pops through the exhaust, you are lean, turn it out 1/4 turn at a time until it stops. If you get to 4 turns, you need to go up a size on the pilot jet. If no popping, turn it in until it starts, then back out just until it stops.

 

cool, thanks for the help.. I'll put it all back on sun. thanks again..