This snowmobile was purchased by my dad when it was a few months old from the Arctic Enterprises salvage department. It had spent the winter in at least a few races but we do not know by whom it was driven. After arriving here at the store, it was soon sold to a young local guy that would become my brother-in-law just a couple years later. While Don owned it the original 399 Kohler EXT engine failed and it was replaced with a new non-EXT 399 Kohler engine, that is the engine that is still in it today. After the sled was again sold in the mid 1970s, everyone lost track of it. We bought it again in late 2001. It arrived here with the steel bulkhead broke-off, shot clutch, weak engine, etc. It had been determined that it had reached the end of its practical life as a daily driver. A few months later, the snow melted and we were parting out some sleds that had accumulated here over the season. When this one was brought in, it was then that we thought that it might be Dons old 70. Upon closer inspection, we determined that it definately was his old sled. In certain types of light, you can clearly see where he had his name painted on the hood, etc. Back to the early 70s... This sled had an auxillary fuel tank bolted to the back that was discarded. It also had dual carbs back when it had the EXT engine in it. The model number on the original tag reads: 399KPEXT. It is published that only 38 of this model were ever produced. As this sled sits here today, it still retains the original hood, seats, tunnel, suspension, etc. We repaired the bulkhead, rebuilt the engine, replaced the clutch, etc. It has run/worked well since the overhaul. If anyone knows any missing history of this sled, please contact us.