Can you post a picture of the end of the muffler?
Another thing might be the restricted fuel flow, carb is slowly using the fuel in the float bowl faster than it can get refilled. Cause by a clogged fuel filter or petcock, or restricted gas cap vent / hose.
One is to remove the gas line from the carb and turn on the gas, see how much it flows.
Second is to run it with the gas cap off when it starts running out of power...
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'08 CanAm Outlander 650XT - Intercooled Turbo in development.
'08 CanAm DS250 - FPP High Performance Clutch Kit and other go-fast mod's , custom Works Performance shocks, +2" billet wheel spacers.
'05 Bombardier DS90 - FPP Hot Trail engine mod's, +2" A-arms, +3 Swingarm, Works Performance shocks.
'04 AC 90 - FPP Hot Trail engine mod's and pipe, +3" A-arms, +3" Swingarm, PEP Racing shocks.
'06 Yamaha Apex Snowmobile - FPP Stage II dual intercooled Turbo, 270HP pump gas.
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