As far as reliability and ease of maintenance, the earlier Deere's are pretty fail safe as long as you've updated things like the ignition. Kioritz engines are easy to start compared to early 80's Kawi's. The later years (82-84) as others have noted are better for that.
I agree, go with a fan cool, such as a Cyclone if you're just hopping around a lake ice fishing. You won't overheat as easily. Yes, they're a bit heavy, but if you're a strong young guy, you'd have no problems.
440 Liquifire Reliability First Sled
Re: 440 Liquifire Reliability First Sled
1975 John Deere 800
1975 JDX8 (VC Finisher 2019)
1976 440 Cyclone (VC Finisher '22, '25)
1974 El Tigre 440 (Sold)
1996 Arcitc Cat 440Z
1975 JDX8 (VC Finisher 2019)
1976 440 Cyclone (VC Finisher '22, '25)
1974 El Tigre 440 (Sold)
1996 Arcitc Cat 440Z