Well I can say from experince that 125's in general are a little more finicky with jetting. I was having a random issue with my Husky 125. In the exact same sections on the track , about 1 out of every 3 to 4 laps....it would bog pretty bad. It always happened after a long hard , about full throttle 3rd , 4th or 5th gear. Not always....just every few laps.
To me...it felt like I had ran out of fuel....maybe to lean on the main? That wasn't it....it was actually to rich. I was splashing the plug with raw fuel because of the vacume coming off full throttle. To cure it I ended up going down to a 460 on the main ( which stock jets don't go down that far ). She's screaming like an angry wasp now.
Lectron's are awesome...but if you take the time to learn your carb / bike and jet accordingly , you don't really " need " one. BUT.....those Lectron's are sweet and easy to adjust and play around with. Less hassle for sure.
" And there goes Jeffro. One of God's own prototypes. A high-powered mutant of some kind never even considered for mass production. Too weird to live, and too rare to die.”