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post #1 of 25 Old 02-13-2014, 05:12 PM Thread Starter
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More power!!!

Gents, I have an Ariens Model ST524 with a very old and tired 5 HP engine. I am considering buying a replacement engine and would like to increase the power output. How big of an engine can I buy to replace the current 5 HP. I was thinking about a ~ 8 HP engine. Does anyone know if the bigger engines will fit on the older ST524s? Any pitfalls to look out for? Is buying a bigger motor a bad idea?
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post #2 of 25 Old 02-13-2014, 05:43 PM
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Predator 6.5 from Harbor Freight should be a relatively easy swap with Plenty of Power. You will, however need to get a sleeve from the hardware store, as you will need a 1" crank size to use the existing pulley on the original engine.
Grind a keyway in the sleeve and fab a larger key to bridge the crank, sleeve and pulley. These Engines work Great. I've done Many Repowers using this Engine. Inexpensive as well, $89 with this coupon.
http://www.dealsoff.com/images/habor-freight-0414.jpg
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post #3 of 25 Old 02-13-2014, 06:36 PM
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I would think the 5 HP ones would have a 3/4" crank to begin with, but Jackmels does this on a daily basis so he probably knows what he is talking about. Make sure your 5 HP engine is only a single shaft one as well.

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post #4 of 25 Old 02-13-2014, 06:46 PM
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Thought the mid 70's Ariens used the same tractor section for all motors. For a situation like that I would say you could put up to an 8 horse on and not even be abusing the unit. However, I believe units with st designations are 1980's machines (starting around then that is). That means you might have two output shafts. It also means the units might self destruct if designed for 5 horse and supplied with 8. I wouldn't put more than a 6.5 predator on there or a 7 HP Tecumseh.

Remove your shear pins and check to see if your augers are frozen to the shafts before you overpower the unit. If the augers are free then in theory your shear pins will fail before your gears are destroyed.
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post #5 of 25 Old 02-14-2014, 02:52 PM
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The ST's use a 1" Crankshaft with Double Pulley. Even the 5hp is a 1" Crank.
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post #6 of 25 Old 02-14-2014, 03:00 PM
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Quote:
Originally Posted by Jackmels View Post
The ST's use a 1" Crankshaft with Double Pulley. Even the 5hp is a 1" Crank.
Just to be clear for my sake. You are saying one output shaft with a double pulley and not two output shafts (Crank and Cam) with one pulley each.
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post #7 of 25 Old 02-14-2014, 05:07 PM
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I hope that is not a double shaft machine (pulley on the camshaft)
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post #8 of 25 Old 02-14-2014, 07:47 PM
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ST Machines I've worked on have a 1"crank that used one double pulley on it. I'd say a rule of thumb is if it has the metal gear and worm style crank for the auger chute, it would have a single 1" Crankshaft. I have seen some double shaft configurations that were on later machines, but I think that started about the time the Auger Crank was attached High on the Chute rather than the low metal gear and worm.
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post #9 of 25 Old 02-14-2014, 07:53 PM
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So its looking good for a predator conversion. I have yet to see anyone that is unhappy with a predator.
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post #10 of 25 Old 02-15-2014, 11:06 AM Thread Starter
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Jackmels, How big is the Predator shaft (diameter)? Smallenginewharehouse.com sells conversion sleeves, with keys, so I need to know if I can buy one to fit the new engine and the existing pulleys.
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