Motorcycle Repair: 1983 gpz 750 pingging, high octane gas, gpz 750


Question
yeah it is all good when it is first started but say i have been riding it at 110 kph [i live in australia] for ten min then nail it it pings.  stop and let it cool down a bit and its fine till it gets hot again thanks for your help so far
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hi all changing the needle did was make it run lean rinchened it up again now thinking could it be a overheating prob as it is there when it is hot and if so what could cause it
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Hi i tryed this  and it helped a little not as bad but still there would droping the needle down one notch help eg lean it off a bit thanks for all the help so far.          DAVE.
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hi i haved have tried hi octane gas and it helped a tiny bit i am now wondering how do i reterd the ignition as it all seems pre set and locked. thanks for the help so far.    DAVE.
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hi i have a 1983 gpz 750 that as soon os it is hot if i accelerate the motor under load eg high gear at about 3000 rpm  it pings
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sounds like timing problem or a gas problem try usin high octane gas to see what it does ,if not check the timing on the bike sounds like it is advanced.im here if you need ok bud.

mitch
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hey dave try one more thing first change to a little hotter plug and let me know i think yur not burning the fuel enough ok.

mitch
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yeah try that drop the needle one notch let me know,im consulting with one of my mechanics here at the shop ok bud

mitch
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very possible if you crank it then take of if it doesnt ping then a few miutes latter it doews .let me know i have a solution or you can call me at home 225-218-9080 baton rouge louisiana . o.k or my cell # 225-413-7251

mitch

Answer
chk yur oil make sure that it doesnt look milky if it does you have a busted head gaskt. also take yur plug out after overnight if you have one with rust on it you have a busted head gasket on the exhaust side ,if yur oil looks like chocale milk yur gasket is busted on the intake side ok.if these 2 or fine i would suggest changing water pump,and flushing radiator.o,k bud. let me know i can guide you through it ok. i have one in my shop today with same problem bad water pump..p.s please leave feedback we volunteer our time for this site o.k

mitch