I believe it's a 76. I have the repair manual. Iv had it for about 8 years give it a complete rebuild on doits diesel air cooled engine when I got it. Mostly used for snow removal, but got it to fill in crawl space in my quanset before pouring cement shop floor. Starts and runs great. Don't use it much anymore. 10,000 or best offer. Two 0 eight four two 1 73 seven four.