S1 Publishing(Oxford)© 2009

World of motorcycleS
S1 Publishing(Oxford)© 2009
Dogdragons Yamaha XS 650 Engine photo's
 If you are about to do your own maintenance, using these pages, I take no responsibility if you get things wrong!
After removing the ignition system and the 8 head nuts I visualy checked the cams for wear or damage, 
I covered the camchain tunnel and the reast of the head before grinding off the two pins from the "soft" link. On most engines you can remove the camchain from the sprocket, but not this one, it's designed to be split and a soft link fitted. I ground off the rivet heads (after coveing the rest of the head with a cloth to catch any swarf)
I removed the four sleeves and o rings from each outer edge four head bolts
Then I removed the two bolts beside the spark plugs
And the bolt from between the two inlet rubbers


Head and valves
Then removed the camshaft
The right piston, which was the one smoking was carbonized, obviously in need of a de-coke. The carbon was 2.5mm thick in places (I measured it using the vernier guage)
As you can see, the left hemi-sphere is oily as well as being carbonized. The right, is carbonized too, just not as bad.
 
Placing the Valve spring compressor 
When compressed, removing the two collets is easy
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If you are about to do your own maintenance, using these pages, I take no responsibility if you get things wrong!

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