APS - Accelerator Pump Spring
The APS eliminates any wiring tricks that are out there and increases pressure on the pump diaphragm due to its being 50% stiffer then the stock ones.
- Direct replacement for OEM spring
- Improved throttle response
- Excellent companion to the Adjustable Leak Jet giving you greater range of adjustment
- No need for any wiring on the accelerator pump
- Allows use of longer diaphragms pins
How-To install the Merge Racing Spring
NOTE: Fits all Keihin FCR-MX carbs except 07-08 CRF250/450.