I was once taught about the shop technique referred to as an "Italian Tune-Up"
Take your poor-running bike out on the interstate and run it right up to redline through all the gears, then hold it wide open in top gear.
The bike either starts running right, or breaks.
If it starts running right, the tune-up is complete.
If it breaks, you fix it and it should run right after that.
If not, repeat till it runs right.
Same goes for noises and/or leaks you can't seem to fix.
It actually works!
Take your poor-running bike out on the interstate and run it right up to redline through all the gears, then hold it wide open in top gear.
The bike either starts running right, or breaks.
If it starts running right, the tune-up is complete.
If it breaks, you fix it and it should run right after that.
If not, repeat till it runs right.
Same goes for noises and/or leaks you can't seem to fix.
It actually works!