Has made my 2003 yz250 feel unbelievably linear and not in a boring way, instructions were super clear and support from tim has been top notch. Cannot recommend more!

What a difference it made, very smooth transition in power valve opening.

Great support and install videos. This is probably the best mod for the yz250

Ordering was very easy online and customer service was amazing and beyond extremely helpful, it was so nice to have a company do a follow up. The hitlis kit was easy to install and works amazing, so happy with our purchase and was a pleasure to deal with. Thank you!

​I bought the Hitlis Kit about a month ago, installed it recentlly, and just took it out for a ride. The difference is amazing! The power curve is so much smoother and more manageable now, which is perfect for desert riding. I still have that punch of power when I need it in loose sand, but it's much easier to control.
​A huge thanks to Tim for all the support and quick responses. He even gave me advice on carburetor jettings and the head replacement. Looking forward to those upgrades! Highly recommended.