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Pinging When Hot Out

  • Thread starter Thread starter don
  • Start date Start date
don said:
I have left everything as is,( mixture screws at 2-1/2 turns, needles at .040" raised, float level dead in the middle of spec), but went another step up on the main jets from 115's to 117.5's. The profuse pinging is gone!!!! I'm guessing I still have to pick the needles up 1 shim because I get just a hint of ping on initial throttle at lower RPM's. Like when you're puttering down a country road at 40MPH in high gear then hit the throttle hard. It just goes, ping-ping-ping, then takes off.

Thank you all again...........
Click to expand...

I am a bit curious!!

The pinging was when the motor was coming onto the needles and changing the main jet to one size larger fixed the problem. I would have thought that if the needles were just raised enough to emit more fuel then the main jets would not be restricting the amount of fuel getting to the needles. I thought the main jets would only really be required to supply full fuel supply at 3/4 to full throttle.

Any suggestions or explanations.
 
Suzuki Don,

Not sure if this answers your question/curiocity or not, but just more info on how I chose my remedy.

The factory plastic shim thing on top of the needle is .100" give or take. Through the extensive knowledge from all here, the Radio Shack washers are .020" give or take. With 117.5 mains, I only had 2 washers on top of the needles leaving me at .060" rich from stock. Even with the needles at this setting, the plugs still had white insulators. The base ring was on the rich side at 2-3/4 turns out with the pilot screws.

I went to 120 mains, put one more washer on the needles,(bringing me to .040" rich from stock), and closed up the pilots from 2-3/4 to 2-1/2 turns out. That gave me the results mentioned in the latest post, (#18).

Can't say if it's right or not, but that's how I got to where I am. Any other suggestions are humblly welcome.
 
Last edited:
Don thanks for the reply and info.

The reason I ask is because I have a similar problem with my bike. Pinging just I come on the needles. I too have raised the needles but only by .040" and have one size larger main jet, 100 in place of the 97.5 jet.

I am fitting a Dynatek DS3-1 in place of the points this weekend hopefully. I tried retarding the points plate a bit but the engine idled more roughly so I put it back where it was.

Still looking for answers.
 
Don,

Electronic timing on mine, therefore, unadjustable without slotting the mounting holes.

All things being equal, I started at 115 mains and ended up at 120's. I think the Suzuki jet numbers are in a flow rate of some sort. Anyway. I changed by 5. I don't know how the numbers increase, but if you were to increase yours by five, you'd end up at 102.5. I know, here in the US, that size exists. That's what's in the center 2 cylinders of my 550.

You may want to try that and leave your needles where they are. You may even have to drop the needles down a smidge as well as lean out your pilot circuit by 1/2 turn or more.

Good luck and let me know of your progress.

We may be able to answer each others questions along the way and we'll both have properly tuned bikes. LOL
 
don said:
Don,

Good luck and let me know of your progress.

We may be able to answer each others questions along the way and we'll both have properly tuned bikes. LOL
Click to expand...

Yes that would be great to have a smooth, strong pulling motorcycle which powers out of corners without pinging coming from the top end. haha
 
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