250-500cc Engine Pinging

Now the Wr360 is running close to perfect for my rising, l've been hearing the dreaded engine ping at higher speeds at or near constant WOT on 4-5-6 gears - sign of too lean at the main jet/clip height or petrol type (use 91 octane).
Previously use to add some octane booster but since l've had carb problems, I've never encountered this issue with this bike until now that l have faith the thing doesn't foul plugs.

Octane or clip height/main jet?

Jay

what main you got in what carb.
i would say you should be around a 175 main on a keihin 38mm.

Hmmm...I'll check but l think l may have a 170 or 172 in there ATM, l'll try premium (not shell) juice and then do a main jet swap on the trail and see what effect that does.

Cheers fellas...it's good confirmation that l'm on the same wavelength!!

Jay

Ditto on the race gas mix.

My 144 hauls with 1/3 powermist.

My EG pump gas motor needs it for some reason.

I guess you coulg try a thicker bas gasket too.

Could also be plug heat range.
Worst you could do is foul a plug trying it out.

I use a std BR8ES, did put a thinner base gasket but this is the first time in many years that l've been able to run foul plug free in years so l think it's time to inspect the 1/2 to WOT throttle range...damn that's going to be such a hard job convincing myself to go for a ride