What is the pipe hose at the top of the engine?

[Rooz12]

Hi,

I'm trying to replace my engine and my engine has a pipe hose that's connected to a black, fabric hose. The pipe is right on the top of the engine.

Please view the attached image with the red circle. That's my own engine that i will be replacing.

https://ibb.co/p1Kd29H

What's this pipe?


The other engine is for the same bike but doesnt have that pipe on the top of the engine!

Please view the attached image.

https://ibb.co/f92y22W

Can I use the new engine or I need to do anything else to make it fit?


Thanks [/img]

[jeffyjeff]

Best guess is that it is some type of crankcase breather, possibly connected to the airbox or air intake through a filter or purge valve. Looks pretty similar to the valve cover on the replacement engine. Why don't you just swap the valve covers and keep the system operational?
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History shows again and again how nature points out the folly of men - BOC

[Islander]

Yep, it's a breather.

[virus]

Looks like a CG125 clone, the originals never had a breather so I wouldnt worry too much. If the breather pipe fitted rocker cover fits and you want to make it all 'look' how it was then go for it. If you cant be arsed its not going to cause a problem.
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own: 81 xs1100g...
owned: 85 rat CG (sold), 91 GS500e (stolen), 84 gsx400f (scrapped), 81 z250 (siezed, siezed, scrapped), 83 cb250rs (sold), 84 gpz750r ratfighter (killed) 84gpz400 (sold), '80 cb650 ratfighter (wrote off) 95gsx6/12f ratfighter (killed) 91 xj900 (sold)
stinkwheel Well I just had my hands up a pigs fanny. Which makes your concerns pale into insignificance.