Old snowmobile Question???

[CountryBoyRaptor700]

I have a old bombadier moto-ski mirage 3 that starts up, runs good and then when you shut it off for about 1 hour it starts up easy runs good then after 5 minutes it starts bogging out and will not move. Can anyone help me???

[guardrailjim]

For future reference, always give year, make, engine size and model # when asking questions. We need all of that info to give an informed answer.

Does your sled have power valves?
If so, they might need to be cleaned (de-carbonized) in order to move freely.
Might need new cables that operate them.
I would check the carbs first.
Drain the float bowls into a clean cup, to see if any junk comes out.
If there's dirt, rust, or water - drain the tank and install an in-line fuel filter.
Remove the carbs and thoroughly clean them.
Change the spark plugs if they're dirty.