Yamaha YZF R125 cylinder head strip down ~ Cam shaft removal refitting decompression

Here are some photos of remomal of cam shaft from the cylinder head and video below with basic explanation of the de-compression cam.

Remove the bracket that holds the cam in place with bearing and 

it holds the rocker guides in place too and stops them spinning

As you can see below the rocker guide pins are losse and pulling free

 Below is photo of the pins and rocker removed ensure you do not mix up to aim ease of installation they are marked different too 

Camshaft now pulls free easily

De-compression cam closed

And open , when open it activate exhaust valve 

so there is no compression build up when first starting 

at a certain rev count the centrifual weight will fly out and 

operate de-compressor cam to the above position, compression will return and bike with start.

Here is the out and inner cam bearings 

See this entire process below 

Testing the valve for leakage in video below