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Going to have to look aftermarket as the Yamaha base weights do not leave enough room for added power. We have been running and stock the Thunder products weights and spring combo and they are night and day better!

Glad to have you on board! let us know if you ever need anything!

This is where it gets tricky....the stock map sensors only allow the boost to go to 15PSI (at any elevation) unless your tune shuts off the code (we don't recommend that) This is where you get into our 4 Bar map sensor tunes. 18-19 PSI is about the max at elevation. So on stage 4 you will get...

Hey guys, Kyle @ Evo here. I have over 1000 miles at elevation on the EVP tunes and they rock! I can stand a 162 MTX up like its nothing! Overall Very fun tunes for being pump gas. As far as clutching, what I tell customers is with stage 1 & 2 you should be fine with stock clutching. Stage 3...

We do offer a full line of ECU tunning that is plug and play. All done through the stock ECU, as mentioned its not just a matter of plugging in a cable. We can correct fueling and timing for N/A modified vehicles, or timing modifications for boosted applications. Give the guys at the shop a call...

For sure! We have a lot of experience with Mitsubishi ECU's. I think we were the only company that reflashed the Nytro ECU which is very similar.

It will be more than 6 PSI stock. A high compression, 1050 cc Viper engine takes 6-7 lbs to make 180 hp. It will likely be 9-10 lbs or more at sea level to make 180 hp.

Our upgraded IHI turbos are regularly run at 28+ lbs of boost for Mountain Riding and up to 40 lbs for drag racing. We have had very few failures even though these are being operated well outside of their intended pressures. These turbos are nearly bullet proof.

240-250 should be realistic on pumpish fuel. For big power, it will require a different turbocharger/compressor.

The IHI turbocharger should be good up to 22 lbs no problem.

There is a bit of a difference here. Because this is a factory designed turbo system, it will have different cams. The Viper/Nytro engine had high revving cams which would make more and more power up to about 10,000 rpms. With that said, you can be sure we will be exploring the power...

To our customers who have and issue with clearance at the valve cover: Please contact us via email techsupport@evopowersports.com. We arrange for shipping to have the issue corrected and sent back to you asap. We apologize for the inconvenience. With respect to tunnel protectors - We had...

Hello All, With respect to our Turbo High Compression and Turbo Low Compression reflashes - We spent much time with MPI 3 or 4 years ago helping them make their kits better through tuning the OEM Mitsubishi ECU. What we found is a modest timing retard (stock compression) does not loose more...

We now have an ECU reflash which will make high compression kits safer. We also can raise the rev limit which makes clutching the sled way easier and better.

As Haydays approaches, we will likely run a summer sale. We will post to TY when that is going to happen.

Depending upon the type of race, yes they may run other mods, or they are 100% stock except for ECU mods. Power Commanders are not the same as modifying the factory ECU timing tables. For one, without a cam AND crank sensor, a piggyback can only do an approximation of timing changes. All of...

We published a dyno chart last year on this site when we released this tune. Factory Yamaha race teams run increased timing on their race sleds. Why would a factory race team run additional timing if there was no benefit? Also, timing makes the sled more responsive and accelerate harder...

The thing about this engine - both Nytro and Viper - it makes maximum hp right at the rev limit and the power climbs very linearly to the rev limit. The revised timing reflects this same characteristic. We saw less gains at lower rpms. With respect to fueling - we change the fueling because...

The Mountain Tune has 1 more degree of timing advance over the lake/trail tune. We have tested this setup with the stock exhaust and an aftermarket exhaust. Our dyno run starts at approximately 7000 rpms. I am not sure how much power it makes below that rpm, but there is timing added down...

With respect to the Hurricane kit, it does not appear that the timing curve is altered, although I am not sure. If they are using stock timing, then there should be a gain by using our reflash.