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Yamaha Wolverine Power Commander Fuel Maps Explained

I don't want to get too deep into this but Yamaha has chosen to run the Wolverine extremely lean for environmental reasons and it is making the exhaust extremely hot and cracking head pipes.  They also incorporated a AIS Valve. (Air Injection System). This valve opens up mostly at idle to allow air to be injected into the exhaust to help burn excess fuel, it makes the exhaust really hot at idle.  People are complaining with the plastic melting under the beds, rear diffs getting really hot along with the cracking head pipes mentioned.  That is caused by the thin material yamaha uses, getting excessively hot and shaking as bad as it does with this single cylinder.  

Also, adding any exhaust tip, slip on exhaust or full exhaust can make it run leaner but it does help get the heat out, so they are a double edged sword on heat and lean.  So since the fuel is an issue with stock exhaust it is still with aftermarket exhausts as well.

We recommend using a AIS block off plate or some other method to bypass the AIS valve to stop this.  We sell the plates for $20 with a Power Commander

So we are offering two different fuel maps for the power commander, one is with AIS in place and one without. Minor differences but we have it.

The full exhaust from HMF we are using is way less restrictive than the stock exhaust and runs cooler because of it. The fuel requirements for the exhaust didn't change enough to need a different fuel map so the map we use is our AIS map.

The difference in stock fueling and our maps as well as the one Dynojet did themselves is at a high point in the map of adding an additional 22% more fuel with the average in the cruise rpm around 15. Wide open throttle didn't change a lot around 5%  The exhausts are getting extremely hot while cruising and no wonder looking at the amount of fuel we had to add.

We used a air fuel ratio of 12.5 which is considered the power ratio.  In the past I used 13 or 13.2 but went with 12.5 on these maps due to the heat in the exhaust.

Truth is, you will be safe with either map we have regardless of block off plate but one is right and one is not I guess.

Any questions call me


Hunterworks Inc.
12097 Kelly Lane

Collinsville, MS 39325
Phone: 601-771-0070
Fax 601-771-0073

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