Ping,ping.

[Shane4371]

I've got preignition from 1/4 to 3/4 throttle,only when hot,i've got uni pods delkivic is slipons,40 pilot jet 117.5 main jet,4 turns out on air fuel mixtue,91 octane in the tank,lifted needles one step high,help

[Mark Olson]

downshift.

[Shane4371]

Did that!!

[Shane4371]

Did that!!

didn't help,turbo blue 106 octane stops it tho,91 to 9e octane doesn't help

[Mark Olson]

is this a recent development? pinging in all gears when hot?

what rpm are you shifting at?

[Shane4371]

Ok my ignition is stock,it's been a issue for some time,in 55th gear at 55 full throttle ping ,from
11st to 2nd full throttle ping,323rd gear at 35 mph full throttle pi,only when hot,not cold

[Mark Olson]

go one step colder on your spark plugs.

what sprocket and gear are you running?

[Shane4371]

17/41 gears,i got nvm iradium plugs,could be the issue?

[Shane4371]

Ngk

[Mark Olson]

good gearing, go a step colder on the plugs and see if that does it.
if you are weighing in over 300 lbs with rider and gear that will have an effect when bike is hot.

I used to have the same problem when hot.

I run
155 air bleeds
42.5 pilots
118 mains up 1 from center on the needles.
.880 on the floats.

no pings anymore no matter how hot it gets.
also flushed out my oil cooler that was clogged with goop.

[Pat Conlon]

Yep, read your plugs.

Valves adjusted?  How's your (hot) compression numbers?

[Shane4371]

Not close to 300lbs,I looked the ngk iradium plug and the oem ngk plug are the same heat range.I'll check valves again.

[a.graham52]

You haven't changed fuel quality have you?

[Shane4371]

Ok,fellas I'll put this thred to rest,i've discoverd my problem,previous owner did a magnetic pickup mod to it,advanced timing,i've retarded her,no more pinging,thanks all for the help,

[FJ_Hooligan]

Ok my ignition is stock,it's been a issue for some time,in 55th gear at 55 full throttle ping ,from
11st to 2nd full throttle ping,323rd gear at 35 mph full throttle pi,only when hot,not cold

Those are some really interesting numbers.  :-)