[herbie]

When I bought my first China bike, the Bashan Brozz from Peace sports, it came with a stock jetting of 38/108 also and I believe it ran pretty good too. If you don’t plan on doing any modifications and are happy with the way that it runs then I wouldn’t change anything if it were me. A 112 main may be beneficial to a small degree especially if it’s a tad lean. The main jet and needle play together so to a small degree you will flow a tiny bit more gas with the larger main from 1/4-3/4 throttle but the most change would be from 3/4 to full throttle where the main jet is taking over. Will the 112 main give you more top end? It would be so small that you may not even notice a difference. If at some point you want to make real gains then a new exhaust, better air flow and jetting would be required. Good luck with it, and have fun!!