Author Topic: What does pinging sound like?  (Read 2715 times)

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Offline dnmac1999

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What does pinging sound like?
« on: July 23, 2008, 03:28:38 PM »
  Hey guys i finally got the 500 running. I was out rideing and adjusting the carb, was way to rich. It didnt make the noise when it was rich but as i leaned it up it started makeing this weird noise. I have never heard this before on any of my bikes. It sounds like im hiting the pipe with a hammer. It only does it if i just barelly let off the throttle. Is this pinging? How could I fix this?

Offline stroke.n.smoke

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Re: What does pinging sound like?
« Reply #1 on: July 25, 2008, 04:25:22 AM »
You could try backing the timing off or run race fuel.  I bought some VP C111 and mine doesn't ping a bit since.


Offline Platypus

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Re: What does pinging sound like?
« Reply #2 on: July 25, 2008, 11:45:58 AM »
Probably a good idea to know what spark plug you are running as well.

Offline maddoggy

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Re: What does pinging sound like?
« Reply #3 on: July 26, 2008, 03:11:18 AM »
dnmac, the condition you are describing is called pre-det. or predetonation. it happens to the big bore high compression 2 strokes when you don't use fuel that has a high enough octane rating. the lower octane fuel ignites at alot less compression which is known as spontaneous compression combustion. basically the fuel is detonated before the piston is in the right location on the up stroke which puts major downforce on it as it is still on it's way up putting tremendous stress on the piston, head, gaskets, bearings etc...  when you lean up the mixture in the carb. ,it will get even worse. if the pre det. or pinging is allowed to continue, you will probably be rebuilding your engine soon wether you want to or not. these bikes are built to perform and the big performance costs big money. pay for some quality high octane race fuel in your bike and the problem will surely go away. or you can run lower octane and you'll end up paying big money anyways to repair the damage done to your engine. trust me i've seen it. hope the info helps, MADDOGGY

Offline dnmac1999

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Re: What does pinging sound like?
« Reply #4 on: July 26, 2008, 01:17:15 PM »
  Wow thats exactly what I was hopeing not to hear. I just got it running, and never ran it before. I dont know anything about the head if it was milled or not. Sounds lke it was to me. Ill look for a stock head i guess, and run race fuel untill then. Can I get away with Half and half?

Offline dnmac1999

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Re: What does pinging sound like?
« Reply #5 on: July 26, 2008, 02:47:08 PM »
Sorry, the carb is a round slide. The pilot is a 40, the mian is 340, I can also get you the needle # and slide if you need all too. The spark plug is the racing plug from NAPA. They didnt have the regular one. Does any of this help?

Offline dnmac1999

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Re: What does pinging sound like?
« Reply #6 on: July 27, 2008, 09:54:48 AM »
It is an NGK plug, just not the cheap one. Its heat range is 8. My alttitude is also 2000-2300. The year is 86. I can get it jetted, just wanted to make sure that noise i was hearing is what i thought it was. Ill have to try the gas and see if that works i guess.

Offline BDI

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Re: What does pinging sound like?
« Reply #7 on: July 27, 2008, 11:34:48 AM »
My bad usually if some one is using a plug from the auto parts store it's a champion plug,Sorry for making assumptions.There are many different things that can cause detonation even carbon build up can do it. I hope you figure it out before your bike s**ts a piston, good luck to ya.
Smoke every cigarette like It's your last and ride like you stole something!!!