Pinking or pinging is caused by incorrect timing or incorrect gas type or gas/air mixture too weak. Always run on the recommended gas or an additive if the correct gas is not available. As a 2007 is fuel injected, it is near impossible to set up the timing and mixture without dealership workshop equipment.
Somthing to do with the AC.
Lack of oil lubrication to the valve lifters.
I have the same ticking noise and it seems to be louder on hotter days. I was told by the service tech it's due to the synthetic oil being thinner. I have my doubts, but that's what they said. Still researching for the answer myself.
Unless the motor has very high mileage and has been lugged regularly (causing connecting rod bearing failure), the most common cause of "knocking" in a Harley is a loose or worn compensator. Drain the primary fluid, remove the outer primary cover and check torque value on the compensator nut. If it's within specs, remove, disassemble and inspect the compensator. If the compensator's in good condition, check primary chain tension. A loose chain can slap the "ceiling" of the chaincase, causing a knocking noise. If that's the case, it will leave wear marks in the aluminum.
If you have a bore scope that will fit in through the spark plug hole, you can look at the surface of the cylinder walls. If there are excessive marks on the sides, or the front and back, they must be pulled and repaired.
Pinging, knocking and detonation are all terms for a condition known as "pre-ignition,". That means some of the gas and air mixture is igniting in the cylinder before it's supposed to. And when that extra flame front crashes into the normal flame front (created by the spark plug), you hear a noise, and that noise is pinging. Pinging is something you want to avoid if possible. Engine damage can occur if pinging is severe. Pinging is caused by using too low an octane fuel. Use what is recommended in your owners manual. An engine out of time will also ping, so have the timing checked. Carbon buildup will also cause pinging. A product called Seafoam injected through the intake as outlined in the instructions on the can will help remove carbon and stop pinging. A defective EGR valve is another cause, and also overheating. So replace the thermostat and flush the cooling system.
Questioner gives no indication where the noise is coming from, but it COULD be an indication of a failing CV (constant velocity) joint.
dc motors generate more noise.
That's a bit like asking "how long is a piece of rope?" There are different solutions for different problems. If the motor won't start, you check to see it's getting fuel, compression & [properly timed] spark. If if shifts hard the first place to look is clutch adjustment. If there's an electrical problem you use a probe-type test light to find the cause. If it makes an unusual noise you use a stethoscope to narrow it down. I could go on. Does your Harley have a specific problem?
this is caused from piston to cyl wall clearance when engine warms up the pistons exspand and the noise is less. DON'T WORRY ABOUT IT
Engine running hotter then 220 degrees can cause valvetrain noise. Bad fuel can also cause valve noise / PINGING sound. Ignition timing to high / Advanced to far, can also cause engine noise.
Noise is common from any engine, the TYPE of noise is what you should worry about. Is it a knocking noise? hum? squeak? rattle?