supercharger questions.

Tony8186

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Jan 10, 2015
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Snowmobile
Yamaha Apex MTX
Hi, just recently picked up a supercharged"MPI" apex mtx. How can you tell the difference between a stage one and stage two supercharger system? I understand that in order to adjust the boost levels you need to change the cogs. Would these be the cogs behind the oil tank or the ones under the intercooler? The air fuel gauge isn't working, I assume it just needs a new sensor. The boost gauge reads -26 at idle.. is this inductive of a boost leak? Or could it be something else? After idling for a moment the sled starts to idle rough. If you give it throttle it bogs down the engine. It doesn't shut off, it just has zero power and won't move. You can slightly increase the throttle hold it and it will come out of the "bogging zone" then it will idle great and rip if you give it any throttle. It does the same thing after it's running and you shut it off. Any and all suggestions and ideas would be greatly appreciated
 


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