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
|When the running and you see white smoke it is
possible that oil is getting into the combustion chamber and is burning
in there. If you see oily or carbonized deposits on the spark plugs,
this usually confirms it.
||If you've already checked your valves you'll
need to investigate further.
|1, Check the sides on the bore, you should find
a smooth surface. You can check this with the with the piston in the bore,
just turn push the piston (or turn the crank) to top bottom center
|2, Check the diameter of the bore, you'll
find the measurements in your manual.
If it's smooth and within it's limits,
remove the barrels and check the piston rings.
|3. If you see small scores in the bore it might
be possible to have them honed. I usually run my fingernail across them
to feel how bad they are.
|4. If the scratches are too deep it might,
then it's possible the rings have broken. The pistons will be have also
been damaged if this is the case. There are two choices:
Here there are two deep grooves. This is what
happens if the circlips fail, or you forget them, the wrist pin rubs against
the walls of the sleeve
An oversize bore.
You will also need over sized piston & rings, these usually
come in a kit. Check with you engineer and local parts supplier for the
You will have to this for all barrels.
You could replace the sleeves / piston and rings, either using used
parts or new. Most barrels can be heated and the sleeves knocked out &
replaced when they are hot.
Click here for more info.
If buying second hand, make sure you get the piston(s) &
barrel(s) as a pair(s).