Still not sure what problem is?????

[Silverfox69]

Hello everyone... How ya doing?? I'm stumped-I have a 82 GS650GLZ that makes a pinging noise from the left side of the engine. This is how it happens-riding along in 5th gear when I give her more throttle the ping starts after I back off the ping is gone. Another thing, when I was out riding at night and it was only 58-60 degrees no ping.. The ping sound is like if something came loose and is vibrating. Any words of wisdom would be greatly appreciated..

Vinnie

[doctorgonzo]

Hello everyone... How ya doing?? I'm stumped-I have a 82 GS650GLZ that makes a pinging noise from the left side of the engine. This is how it happens-riding along in 5th gear when I give her more throttle the ping starts after I back off the ping is gone. Another thing, when I was out riding at night and it was only 58-60 degrees no ping.. The ping sound is like if something came loose and is vibrating. Any words of wisdom would be greatly appreciated..

Vinnie

How many RPM are you turning when you try and give it throttle?

[loungeguy69]

Valve chatter?

[Nessism]

Detonation?

[JJ]

Sounds exactly like detonation to me, since it didn't happen at lower temps. You shouldn't "lug" these engines, they were designed to REV. Before you accelerate, downshift a gear or two so your RPM's go up when you twist the throttle.

If that doesn't do the trick, then step up to the next higher grade of gasoline. You shouldn't have to do that though, unless you have carbon build-up on the piston or combustion chambers.

Happy (and safe) riding!

[Nessism]

Not sure if the 650 has a mechanical advance mechanism but if it does, make sure it's working properly.

[rudy]

Could do a compression check to make sure the ratio isn't too high from carbon.

Definitely check the valve clearances too.

What about ignition timing?