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[Murph]

A friend of mine has offered to make a couple of bits for me in stainless steel and I thought a nice shiny breather box would look good.

Of course I would need to know what in there first.
Is it just a spacer where all four breathers come together or is there more than one compartment?

[feeutfo]

There's pics in the breather cleaning guide iirc.

[Murph]

There is indeed - excellent!
It looks like there are seperate tubes or compartments so making a box won't work.
There is a removable cover though so I'll get him to make one of those.   

[YZ250]

There is indeed - excellent!
It looks like there are seperate tubes or compartments so making a box won't work.
There is a removable cover though so I'll get him to make one of those.   

Assume you mean the breather bridge cover, not the box. The breather box is out of sight at the rear of the engine. 

[Murph]

Thats correct.
I simply went by what the call it on Ebay.

Just for clarity, I mean the black plastic part on top of the inlet plenum.

[omega3000]

This 

[Murph]

Yep thats it.

Looks like a cover will be best - it will look the same as making a box anyway.

Good pic though, thanks!

[Andy89]

What are the two middle pipes on the breather box for?
I'm thinking of blocking the two outer ones, and fit a catch tank and i'm curious what the middle ones are for.

[Murph]

I'm glad I posted this thread now.

I had no idea about the breather box on the back of the engine, but now that I do I went and looked at the one on the Swindon engine.  Good job too - the small brass breather has been blocked with some kind of resin - I would have missed that completely!

I will use the breather box from the old engine, after a good clean of course.   

[omega3000]

I'm glad I posted this thread now.

I had no idea about the breather box on the back of the engine, but now that I do I went and looked at the one on the Swindon engine.  Good job too - the small brass breather has been blocked with some kind of resin - I would have missed that completely!

I will use the breather box from the old engine, after a good clean of course.   

Yep that does get overlooked , and gets blocked ... easy job to do though , a quick poke clears it 

[YZ250]

I'm glad I posted this thread now.

I had no idea about the breather box on the back of the engine, but now that I do I went and looked at the one on the Swindon engine.  Good job too - the small brass breather has been blocked with some kind of resin - I would have missed that completely!

I will use the breather box from the old engine, after a good clean of course.   

Yep that does get overlooked , and gets blocked ... easy job to do though , a quick poke clears it 

Also be aware that the small hole is not meant to be the full bore of the pipe. 

[Murph]

Yeah I noted that, but cheers for the nudge anyway.