When I hit the throttle from a stop it bogs until you get up to about 10 miles an hour then it takes off like you would expect it to. Is this a clutch problem? The sled has done this ever since I got it (five years ago) although it is definitely worse this year. I heard someone talking about taking their secondary clutch apart and cleaning it. I've never done this, could this be all it needs to fix the slug-like throttle response?