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Dave (NE) 
Orange Level
Joined: 12 Sep 2009
Location: Eagle Nebraska
Points: 2140
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 Topic: 720 Fuel Consumption
Posted: 16 Oct 2016 at 4:33pm |
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After getting my 720 last Fall, working on it a bit this Spring and Summer, I'm finally using it quite a bit, primarily to pull a lawn trailer around to haul firewood, pick up sticks and leaves in the lawn and simply just for S's & giggles. Really fun to drive around and use. However, it really seems to eat up the gas. Anyone else notice this? Is this normal? Thanks, Dave
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den/southern illinoi
Orange Level
Joined: 11 Sep 2009
Location: Sparta, Illinoi
Points: 1976
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Posted: 16 Oct 2016 at 5:58pm |
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I've had one or more 720s for about 9 or 10 years now. I've learned that you "don't leave home without the gas can". Yes they are hard on fuel. Den
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Own 4 wheel 20, 2-5015, 5020 and associated equipment and 2 electric forklifts.
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Dave (NE)
Orange Level
Joined: 12 Sep 2009
Location: Eagle Nebraska
Points: 2140
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Posted: 16 Oct 2016 at 6:06pm |
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ok, that confirms what I'm finding out. sure do like the little devil though. has turned into a very handy addition around the acreage
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HudCo
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 3520
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Posted: 17 Oct 2016 at 9:21am |
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that onan is a gas hog
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macvette
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Joined: 13 Jun 2011
Location: nekoosa, wi
Points: 1656
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Posted: 17 Oct 2016 at 8:14pm |
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Yep, sure like the tractor, but sure does use a lot of gas. It's worth it to me, tho.
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talntedmrgreen
Silver Level
Joined: 25 Jun 2013
Location: Caledonia, MI
Points: 477
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Posted: 18 Oct 2016 at 8:39am |
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Yup...mine may be the worst guzzler I've had, of any lawn & garden equipment.
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Patterson B1*B1/B1Forklift*B10*BigTen/B1Loader*B110*B208*B206*616*Homelite T16H/T8/T7/RM7E*Landlord/Loader/Trencher*Broadmoor717*Serf525*2110*7790*Legacy XL*Twin 20*Squire9*Squire6*JCPenny 494
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TREVMAN
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Joined: 04 Jan 2010
Location: Regina,Sask,Can
Points: 1635
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Posted: 18 Oct 2016 at 10:41am |
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This is an engine designed a long, long time ago when fuel consumption was not nearly the concern it is today. Having said that, its a good engine, good torque, good worker. Its not worth it to me to do a engine swap. If the onan pops, then I would change it. Until then, keep the gas can handy lol, Trev.
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AC720Man
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Joined: 10 Oct 2016
Location: Shenandoah, Va
Points: 4897
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Posted: 21 Oct 2016 at 3:54pm |
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I have 2 of them and like everyone else said they can be thirsty little fellows if your using wide open throttle to mow or other attachments that require that kind of rpm. But, they are just the handiest little tractor. Built extremly well with a few short comings,,,no power steering. It does a great job with my belly mower, rear tiller, front snow thrower and my Danco bush hog. Really like them both. One has turf tires and one the flotation industrial tires. Onans are expensive to repair, parts outrages, but when they run well you can't beat them for what they were in 1976 as mine are.
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Chief Cockeye
Bronze Level
Joined: 13 Jan 2016
Location: Auburn, KS
Points: 12
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Posted: 09 Nov 2016 at 4:03pm |
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I have an AC-720 with a 20-hp ONAN CCKB engine. It is a serious gas hog; but I also have a Simplicity 4040 with a 16-hp ONAN CCKA engine. The CCKA is far better regarding fuel economy and there is little, if any, difference in power/perfomrance between the two tractors.
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BrianC
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Joined: 16 Jun 2011
Location: New York
Points: 1619
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Posted: 11 Nov 2016 at 12:32pm |
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Was there ever a high efficiency flat head engine?
And yes, I am forever adding gas to my 620.
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AC720Man
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Joined: 10 Oct 2016
Location: Shenandoah, Va
Points: 4897
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Posted: 16 Nov 2016 at 4:35pm |
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There is a kit to mate a Honda engine on the 720's. Probably much better power and fuel consumption. Nothing like an Onan when they run well. Will be a last resort to replace it, I will be happy just to add more gas to the tank.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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