Currently building a sled for my 14 year old son. He had previously rode a 340 Enticer. I put him once on a 600 Vmax I had but it was too much sled for him. I recently picked up a Polaris 400 indy with a 133 track. Bought it on a package deal with a 2 place trailer, 79 Scorpion, and a rough Kawasaki Bayou 4 wheeler all for $1100. Sold the trailer for $700, parting out the 4 wheeler and have made all my money back plus extra still coming in which basically leaves the Scorpion and 400 indy free. Previous owner claimed he had problems getting spark, After noticing and removing a jumper wire on the ignition switch plug I had spark. Sled was last licensed in 2004. Cleaned carbs, replaced fuel lines and fuel pump and found I had a great running 400. Cleaned clutches. Seat was shot so I replaced the tank and seat with one from a RXL I had recently parted out. Mounted Skidoo plastic skis and Fox shocks in front which I had on hand. Cut off the low non adjustable bars and welded on a standard bar mount with a 2 inch riser. I am currently in the process of replacing the 133 X .75 track with a 136 x 1.5 camoplast track I had on hand. Replacing the 9 tooth 2 driver axle with a 8 tooth 4 driver axle. Replacing bearings as needed. Replaced shocks on rear skid with ones I had on hand as well as removing several sets of idlers. So far I have $80 invested in the project (1 used fuel pump, 1 grip heater, fuel line and an used airbox. After the track upgrades I will look into appearance upgrades. Sled should make a good teenager sled.