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nnamssorxela

Removing/altering the CE (octopus) on a 400 with 426(?) head

8 posts in this topic

I was having a little trouble jetting my wr400 with a yz or wr 426 head. I posted in the jetting section and eddie said that I need to alter the CE setup also known as the octopus that the stock wr400 carb (flat fcr)/head utilize. I couldn't find anything that described this modification and I'm beginning to wonder if I do indeed have a 426 head/top end, or if it is all stock wr400 stuff.

I feel silly asking, but is there an easy way to determine what head I have? I tried to search, but all I found was a great deal of threads asking about and explaining the differences between the two motors, not how to distinguish them. I suppose once I figure out what I have, I'll then move on to altering the "CE."

Thanks,

-Alex

I'll post pictures of carb and head if needed, as they are both off of the bike at the moment.

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I feel silly asking, but is there an easy way to determine what head I have?

Look for a number stamped just below the intake port on the head

5JG00 - you have a YZ/WR 426 head

5BE00 - you have a YZ/WR 400 head

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Isn't there a vacuum port near the intake manifold that is not there on the 426 head since the hot start is internal in the newer fcr carburetor used on the 426?

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pictures!

umu, according to what you posted, I still have the 400 head.

gcannon, looks like there is indeed the vac line, so again, I'm thinking 400.

parx, the head is either from a 1998 wr400 or a 2002 426. basically the only difference I know if is the hot start line, and the valves being stainless on the older 400 and ti on the 426. Is that the only differences? I'm so confused.

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