Julian Solomensky jsolo at
Fri Apr 20 11:41:31 PDT 2007

Hello Jeffrey,

Pinging or detonation can occur if there are carbon deposits on the cylinder tops and ignition occurs due to hot spots instead of the spark plug (in very layman's terms).

I don't think a carb sync will help pinging.

Could it be you just got a bad tank of gas?

The only time I noticed pinging on mine was after installation of the ignition advancer and accidentally putting in 87 octane gas instead of premium.

I would try a different gas station next time.  

I wonder if too lean a mixture might cause this too?  Those better in the know will likely chime in soon :)

Friday, April 20, 2007, 1:02:31 PM, you wrote:

> Today I noticed a bit of pinging when accelerating with medium
> throttle in 4th gear at about 3000rpm. This just a touch below
> 40mph. I'm running 92 octane Chevron fuel with some Seafoam added.
> This bike is new to me so I haven't had a chance to sync the carbs
> yet; the idle is a little rougher than I'd like so I think they need
> to by synched. Has anyone else ever had pinging trouble? Could out
> of sync carbs be the cause? 

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