Smell from fourtrak

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Hi I tow a caravan with a fourtrak 3 yrs old after we arrive and set up on site there is a rotton smell from under vehicle, not every time just some. anybody had simular problems.

Could be the clutch is slippi

Could be the clutch is slipping although surprising with a 3yo motor. Do you use a lot of clutch slip when parking the van up? Might be worthy trying low ratio when moving the van around.