IS KEIHIN THE ONLY SOURCE OF PUMPER CARBS?
No. Mikuni has offered pumper carb kits for decades. Their TM pumper carb kit is a popular Honda mod. Mikuni’s TM accelerator pump system can be tuned externally. Additionally, 2004 Husqvarna four-strokes come with the new accelerator-pump Mikuni TMR carb. Limited information and tuning parts are available for it, and many Husky owners end up switching to an aftermarket Keihin FCR.