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Go look at any single cylinder thumper. They ALL have two headers coming from the cylinder head, but most combine into one tube that goes to one can. The CRF and YZF headers join immediately after coming out of the head. My KTM has two headers that join right before the can.

Some versions of Husqvarna's 610 had two complete pipes with two seperate cans. That is just one of the reasons they were fat and slow pigs (Huskies).
 
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Nice bikes, Conq! :thumb:

In case I'm not the only one who had to look up "bifurcated": :confused: :)

bi·fur·cate ( P ) Pronunciation Key (bfr-kt, b-fûr-)
v. bi·fur·cat·ed, bi·fur·cat·ing, bi·fur·cates
v. tr.
To divide into two parts or branches.

v. intr.
To separate into two parts or branches; fork.

adj. (-kt, -kt)
Forked or divided into two parts or branches, as the Y-shaped styles of certain flowers.
 

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johnnycrash said:
Go look at any single cylinder thumper. They ALL have two headers coming from the cylinder head, but most combine into one tube that goes to one can. The CRF and YZF headers join immediately after coming out of the head. My KTM has two headers that join right before the can.
:huh: ...the YZfours have a single tube/ two-bolt flange header, at least the one's I've owned have?
 
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SomeStrangeGuy said:
:huh: ...the YZfours have a single tube/ two-bolt flange header, at least the one's I've owned have?
Then I guess I stand corrected. I could have sworn the YZF's had a two into one like the new KTM's. Memory is the first to go.
 
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SomeStrangeGuy said:
If it makes you feel better, you'll notice I mention nothing of the CRf, and you don't want me trying to explain any katoom details either for that matter ;)
Looks like I'm wrong about the CRF as well. It has a single header tube also. I was thinking about XR's and my KTM - which have headers like this.
 

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RFVC= Radial 4 valve chamber or some such thing. Two exhaust valves, two intakes. All radialy pointed in at the cylinder making a pretty efficent "hemi" combustion chamber. If you ever have the vave cover off, its easy to see, sorta an odd rocker arm arangement, but it works great, and has since the early 80's.
 
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