Checking isn't the same as adjusting though. I did all my own maintenance on my ICE bike over 50k+ miles and as stated in the manual. My last ICE bike was a ninja 250 2003 (pre-gen) which is easier to get to the valves and adjust vs the "new-gen" 2008+ bikes as you could turn a screw to adjust the valves.
I developed ways to make it easier but it would still take a while to check them, then adjust them, then adjust the carbs because you changed the vacuum pressure :/
On the 2008 bikes, which have shims like most bikes, this process was even longer as you had to do it twice. Once to "check" where your valves were, then a second time to install / rotate the new shims you had to order and wait a week to come in then check it all again and adjust the carbs >__<
One biggest reason I went electric was to avoid the constant maintenance I performed on my ICE bike traveling 13-16k a year ... that is 2 valve adjustments a year 0__0 ~5 oil changes, 3 filter changes, etc ... it adds up and it is time you get back when you don't have to do it on an EV bike.
If you make a spreadsheet to compare the cost of ownership over time + the cost of each bike new. Account for doing all your own maintenance, then prorate your time spent maintenance an ICE bike vs the EV bike, you still will save the full cost of your bike over 4-5 years if you ride it as much as I do. After which the ICE bike is simply costing you each year.
EV's only "save money" if you ride a lot each year (year round commuter) ... if you don't then it is just costing you money for the experience of riding electric. And motorcycles in general are not cheaper than driving a car instead ... so there is always that