Right side of engine cool

[Spleafsgs500]

I have a GS500 2003 and when I start my bike I can feel the left side of the engine gets hot right away and over time the right side will get slightly warm but nothing compared to the left side. Any insights what might be the issue or is this normal. Engine seems to be running pretty smooth.

[moe_tunes]

If one cylinder isn't getting warm it isn't burning fuel...
Checking the spark plug condition would be where I would start.