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Discussion Starter #1
My bike seems to be pinging still when opening the throttle. I've searched around the forums and the answers range from "this is normal" through "add a small amount of seafoam or lucas oil stabilizer to the oil and run for a week" to "I found a cracked piston"..... I am running 93 (I know it only needs 91 - just making sure the fuel is not the issue). I also read that the valves fail over time by getting tighter vs more loose, so it's unlikely that it's loose valves, especially at only 12k miles. I know the sound is not injector ticking - you can hear that at idle. I've run techron through the system to clean it. I'm running 15W-50 full synthetic from a recent change. I do need to change the plugs to eliminate that as an issue (slight stumble at idle). So my question is, should I consider trying a small amount of seafoam in the oil (as has been suggested on this board) or lucas oil stabilizer to see if it helps? Oh and oil level is perfect too, and it's not an issue of the oil filter gasket etc as I did the oil change and made sure. I also know it's not the helical gear noise at idle. It really does sound like pinging, again, only on throttle application. Thanks for any thoughts you may have.
 

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Is this from a stop or are you moving when you twist the throttle?
At what RPM are you "opening the throttle" and how hard are you opening it?
 

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Discussion Starter #3
Moving or from stop - happens both ways. But it is only under load - doesn't do it in neutral.

In terms of how hard I'm applying the throttle for it to happen, I usually apply fairly soft most of the time.
 

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Some ping at low RPM under load is OK. It should stop as the engine gains RPMs. If ping all the time something is wrong. Some of us have done a modification to change the fuel mapping to resolve hesitation issues that make it more susceptible to ping so we have to use high octane all the time.
 

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Seafoam in the oil isn't going to do anything for you.

This is not an oil/lubrication issue.

Pinging under acceleration is predetonation in the combustion chamber.

Running it like that will eventually cause severe damage to your engine.

Caused by too high compression, ignition timing advance too far and/or low fuel octane.
You could try an octane booster (fuel additive). Use a whole lot more than the recommended dosage, won't hurt anything. If it stops the pinging, run it hard to clear any possible carbon build up in the combustion chambers. Check ignition timing.

How are you riding? At what RPM do you shift? Lugging an engine, especially the LT1200 is not a good thing to do. They are designed to turn. When riding leisurely, I shift at 6K, if riding with gusto, run to redline, do not ride with rpm under 4k, down shift and keep it churned.
 

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Not a bike engine but......... I have a 2001 Corolla with 450K on it. at approx 200K it started to ping once in a while under light load gradually getting worse to where it required hightest to stop the pinging. A concentrated injector cleaner applied into the fuel rail cleared the issue 100% and lasted for another 200K before having to be repeated. This engine had always had seafoam run through a tank of fuel every 20K or so.
Not sure if there is a set up to apply concentrated cleaner to the fuel rail like the Toy dealer had.

Yamaha had a very good combustion chamber cleaner also. Have heard many reports of it curing dentonation issues. I have not used it personally so cant speak to it.

A very light mist spray of water into intake of running engine (like from a weed spray bottle) given as much as engine will stand and stay running will clean combustion chambers as clean as a whistle. Used many times back in the carburetor, small block days
 

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Discussion Starter #7 (Edited)
Well I've been running tech on cleanrer through the system, slight improvement in idle quality but still makes the same noise. I added a bottle of octane booster to see what would happen, still doing it. I think now I've been carefully listening that it also did it when I released the throttle from mid to high revs. Next step - O2 sensor (seeing carbon on the exhaust), timing and valve clearance check.... Thanks for the suggestions so far - getting through the process of elimination.

Oh - and I may have been lugging it - I've come from a Honda VTX1800 V-twin which has huge torque from almost any revs, so now I've been paying attention to keep it above 3500rpm always, and gave it a complete rev in 1st and 2nd (this this is quite quick....!!).
 

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Discussion Starter #8
Time for an update. I have no more pinging. My mouse nest infested bike is no longer mouse nest infested. To explain the pinging, attached is a pic of the air filter......

I also spent some time checking the tupperware, fairing screws etc and between no pinging, tupperware screws all checked etc, my ride is now smooth and quiet. Yippee!

Now for a bit of body work (getting the scratches out) - after my 2000 mile ride starting next week.
 

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