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fcr 39 questions

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Hi All-

I looked around and couldn't find a definitive answer. I recently picked up a FCR 39 carb off a yz426 for my DRZ400Sm. I'm now waiting for my OEM and Sudco parts to arrive. I have three questions.

1.) Do I need to remove pilot air jet off the older style carb or just the newer style carb?

2.) I have the stock header on there with a FMF PowerCore 4 slip on muffler. The yz carb came with a 158 in it. Do I need to go back to a 155, jump to the 160, or can I keep the 158 since it's not a stock pipe or a full exhaust.

3.) If I do need new jets, where can I get them?

Thanks in advance!!!

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I ordered the EMN Needle from Sudco.

The guy I bought it from had it for a back up for his yz. So I'm pretty sure it's for a yz. I can check the number on the side.

EDIT: the 5JG5 number refers to the yz 426

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you can try it with the pilot air jet intact but if you cant control the pilot circuit with the fuel screw,remove it.

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Any advice on question #2?

2.) I have the stock header on there with a FMF PowerCore 4 slip on muffler. The yz carb came with a 158 in it. Do I need to go back to a 155, jump to the 160, or can I keep the 158 since it's not a stock pipe or a full exhaust.

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