Toro 521 Pulley Size - Snowblower Forum : Snow Blower Forums
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post #1 of 4 Old 02-02-2015, 09:50 PM Thread Starter
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Toro 521 Pulley Size


I recently picked up an older Toro 521 that was in need of an engine. I have read through the forums and seen many people re-powering them with the 6.5hp clone/predator so that is what I ordered.

Unfortunately the snow blower did not come with the pulley that is on the crankshaft of the engine. Does anyone know what size diameter I need for this?

It looks as if it takes 2 pulleys. From a search I found this on ebay

but was hoping to just pick up 2 new individual pulleys and save some money.

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post #2 of 4 Old 02-02-2015, 10:00 PM
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The 212 Predator takes a 3/4 pulley, which (I believe) is the same size as the 5 HP Tecumseh. You can get pulleys at Tractor Supply, sinc eou don't have the original. I paid about $33 for two pulleys at Tractor Supply.
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post #3 of 4 Old 02-02-2015, 11:03 PM
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I just ordered pulleys for a craftsman I am doing a Predator swap. Measure the diameter of the original pulleys. And you need to figure out what size the original belt sizes are. Some use 1/4, 3/8 and 1/2 wide belts. Then, see the attached chart to figure out what pulley to order with the belt width. Depending on the belt width, it may set further down in the pulley, thus changing the effective pulley diameter.

Example my auger pulley is 2 3/4in Dia and uses a 1/2in wide belt. So I ordered an AK30x3/4 pulley. The effective diameter with a 1/2in belt is 2.80in, which is pretty close to the 2 3/4 dia of the original pulley.
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Last edited by Motor City; 02-02-2015 at 11:15 PM.
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post #4 of 4 Old 02-03-2015, 12:47 AM
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Good resource Motor City. It is a good reminder that the effective pitch diameter is what you need to use to calculate the correct ratio. Not the OD of the pulley which can vary by style.

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Ariens 926LE

Yard Machine 22" upgraded with 6.5 HP Predator
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