brixton 125 tuning with a clean baseline before parts

I am opening a brixton 125 tuning thread because the bike feels honest but a bit lazy once the road opens.
I found this related page while comparing options: brixton 125 tuning. I would rather understand the proper checks before buying anything.
Before I touch electronics, should I check valves, chain, clutch, brake drag, air filter and plug condition?

Discussion
21 repliesBrixton 125 tuning starts with valves and intake leaks if the idle is not perfect.
For brixton 125 tuning, note fuel use before the first change.
Make the little Brixton healthy first
Thomas Spagnoli here. brixton 125 tuning should be handled like a workshop diagnosis, not like a shopping list. I would first make the bike or system prove what is wrong, then choose the part or setting that matches the proof.
For brixton 125 tuning, I would check valve clearance, air filter, plug color, intake leaks, chain slack, clutch free play, tire pressure and both brakes when hot.
Good brixton 125 tuning should make the same hill or roll-on cleaner without ruining idle, starting, fuel use or the relaxed character of the bike.
My order of work
The free motorcycle mechanics course on this platform explains this kind of diagnostic order in plain language. It is worth doing before spending money, because it teaches you how to test instead of guessing.
Chain was a little tight already, so I am glad I asked.
Brake drag hot is worth checking before brixton 125 tuning parts.
Same hill, same rider, same gear.
Brixton 125 tuning only means something after the baseline is fixed.
A tight chain is the cheapest anti-performance accessory.
I will do valves, chain and plug first.
Brixton 125 tuning needs a full tank comparison after that.
Also check the airbox seal before calling brixton 125 tuning finished.
Correct. Brixton 125 tuning should not hide a service fault.
Post before numbers first.
And rear brake temperature for the brixton 125 tuning notes.
Will do.
The bike may get faster by being less neglected.
That is still brixton 125 tuning in my book.
Exactly. Brixton 125 tuning starts by removing losses.
Waiting for hill numbers.
And plug photo.
I will update after the weekend.