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Ping,ping.

Started by Shane4371, June 17, 2016, 08:48:08 PM

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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

Mark O.
86 fj1200
sac ca.

                           " Get off your ass and Ride"

Shane4371


Shane4371

Quote from: Shane4371 on June 17, 2016, 09:07:53 PM
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?
Mark O.
86 fj1200
sac ca.

                           " Get off your ass and Ride"

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?
Mark O.
86 fj1200
sac ca.

                           " Get off your ass and Ride"

Shane4371

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

Shane4371


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.
Mark O.
86 fj1200
sac ca.

                           " Get off your ass and Ride"

Pat Conlon

Yep, read your plugs.

Valves adjusted?  How's your (hot) compression numbers?
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

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

Quote from: Shane4371 on June 17, 2016, 09:16:38 PM
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.  :-)
DavidR.