A few months ago I bought this Agco Allis 918H from fellow member Mike aka Case442. When I bought the tractor the engine would run but only with full choke. After running for a few minutes and warming up the engine would bog down and stall. Mike had told me that the tractor had sat for 10+ years so I knew it was running bad due to a dirty carb.
First I tried to take the carb apart to clean the inside but two of the bowl bolts stripped so I couldn't get them out. Discouraged I tried a few different tricks in an attempt to clear what ever the blockage was. They didn't work.
Since I couldn't get the bolts out and had nothing to lose I decided to drill out the bolt heads. Of course after I drilled through the bolt heads the bolts turned out by hand. The inside of the of the carb was nasty. There was a lot of chunks of what was left over from the old gas drying up. To be honest I'm surprised the engine even ran at all. I got lucky and was able to replace the bowl bolts with two that came from an Onan carb.
After getting everything back together, the engine runs like new. Now I just need to get a deck drive belt and I'll be set for next year.