Can hear ticking sound around engine - 2000 Suzuki GZ 250 Marauder

There are two kinds of potential noises to be concerned about here. I assume the low oil pressure warning light is not on, or at least you did not mention it. When the engine is at operating temperature and at an idle, you may hear more of a "tick" sound with a frequency of about two or more ticks per second. This is valve train noise from either a mis-adjusted rocker arm or a failing lifter. However if after warm up, the noise is more of a "knock" and occurring at a frequency of half of the rate of a valve tick, or about once per second you have a more serious problem with a main crankshaft bearing or a connecting rod bearing. If this is the case adding oil will not help - the crankshaft is already damaged and the engine will require a complete overhaul.

Drain the oil and check for metallic particles - if present then there has been metal-on-metal contact somewhere in the bottom end and the engine has been damaged.

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Ticking sounds like a dry lifter, when was the last time you changed the oil and filter? Humming sounds like you need a tire rotation because of uneven tire wear.

Well without hearing the tick it would be impossible to diagnose over the net. But it sounds like you have a handle on where to look.
While under the hood, exhaust and lifter ticks would sound different. A lifter would be kind of muffled while exhaust being in the open, not muffled.

Exhaust leaks are easier to see than finding one lifter ticking. Exhaust you can look around the manifolds and down pipes for black soot. You can also carefully pass your hand around things and feel for exhaust coming out.

Be sure to look at the manifolds themselves for cracks. If those manifolds have any heat shielding there could be a good place for cracks.

You do not say whether the engine is running at the time that you hear the ticking. It is not uncommon to hear a fuel pump ticking before an engine is started if the ignition is switched on. This is simply the pump pushing fuel up to the engine if it has drained back in the fuel lines slightly, whilst the vehicle was parked.
In some cases it might indicate a faulty pump.

no. 3 plug, wire or coil pack. Remove the plug wire one inch from the plug using a properly insulated plug wire tool with the engine running, if you hear a tick, tick sound then it's the plug if you don't hear a tick tick sound it means it's the wire or the coil.

Sounds like an Exhaust Manifold leak on only one cylinder. The Gasket is probably blown out. Check around where manifold is bolted to the engine. Any leaks are usually evident by a black sooty deposit.

sounds like you need a new distributor cap sounds like its arching out and causing a misfire

change the exhaust port gaskets also take the heat shield off of the "Y" pipe under the seat that connects the front and bear ex. and look underneath as this area is prone to craking and makes a noise similar to the front ex valve being loose tick tick tick tick...........

that is the lifters or tappets doing that due to they could be warn out or also you have a slack oil pick up when the sound fades it means oil has reached them you will have to see a machanic to fix them around $150 to $220.