If you have a Yamaha you need one. Best thing I bought for my bike.
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The Power Tuner is great tool to have in order to change engine mappings on the fly for whatever riding conditions you're dealing with.
I ride So Cal Desert and Track. I haven't found a tune I like for the desert however if your on a MX Track this is what you need! I use the Jay Marmont tune at Elsinore and what a difference! 3rd gear is tall and strong, tons of mid power and bites off the gate
its great to upload maps quickly. either expirement and make your own, or you can find many on the web and even on yamaha's site. you can see your hourmeter and it will read trouble codes, and many other things. this is a must have tool for the 10+ yz450f
This is a very good tool. It's easy to use and the new maps really change the way the bike feels. I have a 2011 YZ450F with PC pipe, Twin Air filter kit and some head porting and going to the "Marmont Map" really woke the motor up. One word of caution: this is does not come loaded with maps, so you will have to do some research on the internet and set up the maps yourself. Also, unless you like to tinker with settings, you'll only use it once or twice (until you find the map you like) then it will sit on the shelf. Overall, I'm happy I bought it.