Cylinder Pinging

You didn't mention if you checked the timing. I think if it is too advanced
it can cause pinging.

"hE" wrote in message

 > I've got an '03 PW50, about 6 months old, and about 50 hours riding time
on
 > it. About 3-4 weeks ago, I noticed a "pinging" or rattling noise coming
 > from the cylinder. Thought maybe it was running too lean but it checked
out
 > OK. Then I thought it was the fuel so I switched to a 93 octane...still
 > pinging. Compression checks at around 115-120 psi. I removed the head
and
 > jug and decarburized the piston crown and head and checked for signs of
 > scoring....didn't find any. I'm out of ideas. Any suggestions greatly
 > appreciated.
 >
 >
 >> Stay informed about: Cylinder Pinging 

Also be very sure that the cylinder is in fact the place making the noise
and that it isnt being "referred" from somewhere else. I was looking at a
used y-zinger a week or so ago, and now that you mention it, this one was
making a noise too. sounded like it was coming from the cylinder but in
fact was being made by the clutch. After warming it up, i lifted the back
end up and ran it in gear for a bit. The noise seemed to diminish, does
yours?
"Harry Balzak" wrote in message

 > Probably piston slap. Check the clearance of the piston skirt to
cylinder.
 >
 >


  > > I've got an '03 PW50, about 6 months old, and about 50 hours riding time
 > on
  > > it. About 3-4 weeks ago, I noticed a "pinging" or rattling noise coming
  > > from the cylinder. Thought maybe it was running too lean but it checked
 > out
  > > OK. Then I thought it was the fuel so I switched to a 93 octane...still
  > > pinging. Compression checks at around 115-120 psi. I removed the head
 > and
  > > jug and decarburized the piston crown and head and checked for signs of
  > > scoring....didn't find any. I'm out of ideas. Any suggestions greatly
  > > appreciated.
  > >
  > >
 >
 >
 >> Stay informed about: Cylinder Pinging