World of motorcycleS
S1 Publishing(Oxford)© 1999-07
This is just a general
If you are about to do your
own maintenance, using these pages, I take no responsibility if you get
Modified for 2009
|What do I look for when checking
|1, Check the top of the piston and see if it is carbonized, if so de-coke
2, Check to see if the top ("crown") is damaged.
On this piston there is a small piece missing and broken, and
there is a lot of carbonizing, Probaly caused by running the engine with
|3, Check the sides and the grooves where the rings fit, also make sure
there are no bits of grit blocking the oil wholes in the lowest groove.
although this piston is dirty and old, it would be usable when clean. the
wear is normal in an 20yr old engine
|The side of this piston as severely damaged, you can see theat the
rings have broken, and the small pieces of broken rings have found there
way through the top of the piston, and have got into the combestion chamber,
on there way the ripped lots of small but deep grooves through the bore,
and got jammed into the valves, damaging the seats and the valves. If this
happens to you, you are looking at a heafty bill just for parts.