Holtzman Engineering provides the latest in innovative fuel delivery products for snowmobiles, motorcycles and ATVs improving performance and fuel economy while reducing emissions. These compensators adjust fuel flow for changes in atmospheric conditions (temperature and pressure) from as low as idle to wide-open throttle, delivering optimum engine performance while saving fuel and reducing emissions. One compensator will control multiple carbs (one required per engine). Installation time is typically 1-2 hours.