Today I picked up two Sears chainsaws, a UD4 model and a UG4 model. I remember seeing these listed back in the fall/winter of last year and figured they had sold after the ad disappeared. Well they were relisted again yesterday and I decided to go look at them. After talking to the owner for over an hour about the saws, old tractors and various shows I decided to buy them. He told me that the UG4 has been in his family since his grandfather bought it new and he picked the UD4 for up many years ago. The UG4 turned over with good compression but the UD4 was seized. I ended up paying $80 for the pair which I feel was ok but it might have been a little high, let me know what you think.
After I got them home I decided to start checking out the UG4 first. Right now it doesn't run due to no spark and the recoil spring will need to be replaced. As I was working on the saw and moving it around I noticed a hole in the bottom of the gear housing cover. It seems that years of sitting caused the aluminum to corrode in that small area pretty bad. Luckily inside of the gear housing is in good shape and I think I can fix the cover with some JB Weld.
Next I moved onto the UD4. First I pulled the recoil off to check if it was seized. It wasn't but after pull the rope twice the recoil spring gave up on it too . I started to try to rock the flywheel back and forth with my hand and the engine freed up. It turns out that the engine was just lightly stuck from sitting. I got very lucky there. I also tried to start it but just like the UG4 it has no spark too. After neither would start I called it a day and headed inside before the rain came.
A couple of random interesting facts. First G means gear drive chain and D means direct drive chain. Due to the two different drive systems the engines run in opposite rotations in order for the chains to move in the same direction. Also look at the massive size of that drive sprocket. Sears wasn't messing around lol.