2019-2024 YAMAHA YZ250F Intake Valve and Guide upgrade! This is a MUST do for this model. The OEM intake guides are known to crack and cause an engine failure, same for the OEM intake valves… they be prone to the valve heads popping off. Not to mention... the stock OEM guides cost upwards of $200 each! Yikes! Upgrade your bike with our premium kit featuring: - 2 Del West High Flow Intake Valves - 2 Moldstar Intake Valve Guides The guides are expertly designed with a machined step for easy, precise installation, eliminating the risk of pushing the guide in too far. The intake guide material is superior to the stock steel guide which are prone to cracking on the model! For optimal results: - Professional installation is recommended - Hone the guide to size - Machine/Touch up the intake seats post-installation for a concentric valve-to-seat seal.