Just wow. As an upgrade from stock and also to revive a bike that hasn't run in 2 years, this was a massive improvement. The stock Keihin made the bike feel restricted and anemic. The VM26 unleashed more of it's fuller potential, immediately. changed the main jet to 160, set air and idle to a general starting point and within 10 minutes the throttle cable and air/fuel mixture was easily dialed in. Why doesn't the KLX140 come standard with this carb? Great kit, complete, reasonable, shipped quickly- I had the part in just about 4 days- tearing it up by the weekend. If you have a KLX140, you need this upgrade.