I have a 2001 MXZ 700 SKI-DOO and @ times it will idle fast after a cold start, like normal idle 1600 this is nearly 3900 and it engages the clutch @ 4200. The carbs have been cleaned and checked set & re-set? Could it be the DPM and how do we test it if it is?

Hello Ron.
In order for the high idle to take place it needs air (oxygen).
This air must be getting in somewhere.
Make sure the throttle cable has some play. If it's too tight it will hold the throttle open.
If you are sure the slides are set up properly (not staying open), you will need to find the source of that air.
Make sure the rubber grommets behind the carbs are not cracked and are properly clamped.
If there is nothing obvious you may have bad crankshaft seals. If the crank seals are bad it will allow air to enter the crankcase. In a 2 stroke that is where the air/fuel mixture is pulled into the engine.
If indeed this is where the air is coming from, the engine will need to be removed, the crankcase split, and the seals changed.
I hope you will not need to do this. But don't run it until you know for sure as this extra air is not mixed with oil and you could damage the engine.
Let me know if you need more advise concerning this problem.
Thank you for using FixYa.

KL

Thank you for using FixYa.