Was Googling screen for a CB125e and came across your thread so spent some time reading start to finish.
Bought one at the begining of the year, last day of the $2500 on road and been using it for work duties.
1st day riding it started stalling every time I stopped, turned out the vacuum tubing to the air injection valve was too short and kept coming off. I replaced it with a longer bit of tube.
Another time it ran out of power, blocked main jet, a bit or rubber from the fuel tube I think.
Did a few mods, 5 x10c coins under each fork cap for some preload and it's better for my road usage. Like you around 85kg.
Fumoto drain valve, so I can drain the oil quickly. 5 minute oil changes ( only 800ml of oil eh)
Top box from 3rd gear, bangs around a bit over bumps, wouldn't be any good off road. Holds my lunch for work and my helmet while I'm there though.
That IXL exhaust, Hey it's ok for road use, but agree that centre stand brackets a bit cheesey.
Got the red one with the silver sidecovers that I wasn't keen on (the sidecovers) so picked up some grey ones of a white model for 30$ and also painted the pillion brackets black.
Cut a hole in the airbox cover and removed the metal grill under the airfilter, It's only there to stop the airfilter catching fire in the event of a backfire.
Changed the front sprocket to a 17 tooth, wanted a 16 but none available. Had to file the case saver a touch for clearance. Now 4th gear is a touch lower the 5th was stock, I like the revised gearing.
All that and no real effect on top speed, does about 92-94 on the flat although I have seen 100 wind assisted. mid range power may have improved a little
Rejetted to 115 mains and it went slower, lol, dropped back to 110 (108 stock)
1 shim under the needle.
Had the tank replaced under warranty, small bubbles deleloped under the paint.
Changed the oil at 80 klm
Changed the oil and checked the valve clearances at 600 klm No adjustment necessary
Removed the air injection BS reducing weight by .25kg.
How much was the Puig screen? Maybe that will increase the top speed.
Fumoto drain valve, Had to trim the fin on the sump a litte to install.
In all her redness