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Discussion Starter #1
Hello everyone.. New here as of today. I'm a die hard old school Ariens guy. Got an old 724 with Tucumseh power and I wanna convert it to have a lighting coil. Anyone have any input on what part # from Tecumseh I can use to convert this machine?.. I've tried to scroll through the internet but have come up empty handed.. Any help would be greatly appreciated.
 

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You need a flywheel with two coils, and a stator to match. I don't know part #s, but your best bet is to check those old lawn mower shops you see along the road with a lot of machines in the yard.People will come on with the part #s for you'
Sid
 

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:welcome: to SBF Mc68671. The information you need is dependent on what the model and spec number is on YOUR motor. There are numbers stamped into the top of the recoil shroud just in front of the spark plug. If you have electric start, you will have to remove the switch assembly to see the numbers underneath and someone here will be glad to help once we know what you have.
 

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Discussion Starter #4
Thanks for the feedback. I do not have electric start on this one. I can grab the numbers off the shroud when I go back in the garage.
 

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Assuming it uses the same as a 10 hp would, you're going to need 2 main assemblies: the flywheel and the pickup. The flywheel likely will have magnets around the perimeter of it. Along with that, the pickup is incorporated with the coil inside the flywheel. You're going to have to change that out, meaning you're also going to have to retime the engine.

I've done it having to fully break down an engine I was rebuilding. It's not terribly difficult but you have to follow the instructions exactly to get it to run. I found them on the web somewhere, so I can't give you details at the moment.
 

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Welcome to SBF. Sounds like an interesting project. Please do a write up about it as you do it for others who might be interested in doing the same thing.
 

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Discussion Starter #7
to SBF Mc68671. The information you need is dependent on what the model and spec number is on YOUR motor. There are numbers stamped into the top of the recoil shroud just in front of the spark plug. If you have electric start, you will have to remove the switch assembly to see the numbers underneath and someone here will be glad to help once we know what you have.
Hello again. I got the numbers off the shroud. HS50-67008A...... SER-5241B
 

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Hello Mc. I'm afraid I have some bad news. You said the machine was a 7/24 which means 7 hp 24" width bucket. The engine numbers you posted are for a 5 hp motor which makes me believe the engine was replaced at some point. The bad news is, they do not make alternator systems for that size motor.
 

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Interesting. Machine came from an old timer who bought it brand new and it has the original motor on it.. But when I run the numbers off the machine it comes back as 724.. I'm gonna double check the numbers off the machine..
 

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Interesting. Machine came from an old timer who bought it brand new and it has the original motor on it.. But when I run the numbers off the machine it comes back as 724.. I'm gonna double check the numbers off the machine..
If you're looking at the Ariens "parts radar" site, the site definitely has some errors.

I had an old 7 HP 32" machine, model 910954, and when you look it up on that site it correctly lists it as 7 HP, but says it's a "ST724" 24" wide model. If you go to the manual download site and get the parts or service manual, it's listed correctly.

But I agree with the others: if the Tecumseh part number starts with "HS50", it's a 5 HP engine. Unless someone switched the cover...
 

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Regardless I've found the lighting coil for a 5hp Tecumseh on Ebay. Rupp used to male them but not anymore.. And they aren't cheap!.. Going down a different road now. GM 1 wire alternator running off of another pulley that I TIG welded on to the main drive pulley.. See what happens.
 

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Regardless I've found the lighting coil for a 5hp Tecumseh on Ebay. Rupp used to male them but not anymore.. And they aren't cheap!.. Going down a different road now. GM 1 wire alternator running off of another pulley that I TIG welded on to the main drive pulley.. See what happens.
I see another belt in your future.
 

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Neat idea! But... how large is the pulley you added to the crankshaft? Typically an alternator pulley is about 1/3 the size of the one on the crank, making it rotate at 3x crankshaft speed. If you have a small pulley on the crank and the alternator turns too slowly, it won't self-energize and you won't get any output.

On the other hand if it does work, you should get all the output you could ever want! :)
 
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