Modded my airbox check the link out ppz
Reece Conor Mcdonald shared his post to the group: Honda MSX125 Owners Club.
What have u done to the air box
I did the airbox mod a while ago. Mine runs perfectly. I got a 3d printed trumpet insert to widen the internal snorkel, I obviously pulled out most of the internal snorkel as it really restricted airflow.
This is the insert, works well not bad for £10, I've seen people sell the up to £60, addmittly that's for metal ones. These green ones are super solid though and I've had no problems what so ever.