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Discussion Starter #1 (Edited)
So I've had this thing for years and have been gradually getting it to be a bit more reliable. I'm at a point where I'm going to be replacing the carb and wondered if I shouldn't just replace the motor. It looks like for less than a couple hundred I could upgrade to a 10hp or something. Problem is, although I'm well versed in car repair and such, I have no idea how to go about the selection process of deciding which motor is going to fit when it's not stock or if the machine is worth upgrading in the first place (or will more hp/torque just shred everything it's connected to). It seemed ancient when I got it, so I may just be keeping a zombie going.

Any suggestions?

Since apparently I can't post images direct, here are links (just add http):




Everything I can find on it in case you can't get to pics:
Noma 5hp 24"
6 speed
old as ****
# on engine: HSSK50 67317N
I see nothing on DOM except 42590
 

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is the engine a dual shaft or a single ? if its a single, a 212cc predator for about $100 , or if your in canada you can get the 208 cc powerfist for about $140 on sale. both those engines should be a bolt on, with possible easy mods to the chute rotation rod.
if its a dual shaft engine......not so easy, but not impossible to "chonda" it.
 
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Its a tecumseh eng, do u want to up the hp? I repower machines all the time. Sticking to tecumseh is easier. Depending on the year of eng anything over 7-8 hp will have a bigger crank case cover so the eng will sit farther back on the frame. Usually noma was good about using the same frame on machines with bigger engines so theres should already be holes that will take a bigger eng. other things to look at are, if the eng is moved back is there enough space between the handle bars and pullstarter on eng. ( bigger eng usually sits back about 1.5in). The same crank shaft size helps when fitting pulleys. My latest job was changing from a chineese 5hp on a cub cadet to a 8hp tecumseh. I got lucky, everything changed over as if same eng. i lost the headlight tho, No stator on older tecumseh :(


-efisher-
 

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Discussion Starter #4
Looks like a single. Any geometry changes I'd need to make (like pulleys, different belts, etc) or would it be entirely the same except a more powerful engine?
 

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Discussion Starter #5
Its a tecumseh eng, do u want to up the hp? I repower machines all the time. Sticking to tecumseh is easier. Depending on the year of eng anything over 7-8 hp will have a bigger crank case cover so the eng will sit farther back on the frame. Usually noma was good about using the same frame on machines with bigger engines so theres should already be holes that will take a bigger eng. other things to look at are, if the eng is moved back is there enough space between the handle bars and pullstarter on eng. ( bigger eng usually sits back about 1.5in). The same crank shaft size helps when fitting pulleys. My latest job was changing from a chineese 5hp on a cub cadet to a 8hp tecumseh. I got lucky, everything changed over as if same eng. i lost the headlight tho, No stator on older tecumseh :(


-efisher-
Yeah, the goal would be a bigger engine. My assumption is that this thing's old enough it's probably lost most of the HP it started out with, so even a 1:1 would be better. But if I'm going to do it, I'd just as soon give it a bump.
There should be enough room for a pullstart, although maybe I should look at getting an electric start engine if possible.
My hope is that I'd be able to get a bigger engine with the same shaft so I wouldn't have to worry about all of the geometry changes that would come w/ new pulleys and such.
 

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To use the extra power i might find a bigger auger pulley, maybe like 1/4 bigger. Tractor supply has pulleys in stock, if not there then online. OEM pulleys somtimes are one piece, drive and auger. So i buy 2 separate pulleys. New tecumseh engines arent made now, so would need to find used or leftover expencive eng at dealers.


-efisher-
 

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the 212 or 208 chonda will use your pulleys and same belt, and same belt cover. you will grin from ear to ear upgrading from a 5hp tired tech to a "6.5 hp" chonda. throw in an impeller kit.....and it will be better than many new machines as far as snow moving goes. if you are handy with tools, even with the chute rod mods, its an afternoons work or less .
 
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Discussion Starter #9 (Edited)
To use the extra power i might find a bigger auger pulley, maybe like 1/4 bigger. Tractor supply has pulleys in stock, if not there then online. OEM pulleys somtimes are one piece, drive and auger. So i buy 2 separate pulleys. New tecumseh engines arent made now, so would need to find used or leftover expencive eng at dealers.


-efisher-
It looks like mine has the pulleys attached individually. Are you saying 1/4" bigger or do you mean size*25% bigger?
I go back and forth about whether I'd want to reuse an old engine when new ones are so cheap, but it would be nice if it's bolt-on.

Ya the chonda engines scare me, but they are gaining popularity


-efisher-
Why do they scare you?
 

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Discussion Starter #10
the 212 or 208 chonda will use your pulleys and same belt, and same belt cover. you will grin from ear to ear upgrading from a 5hp tired tech to a "6.5 hp" chonda. throw in an impeller kit.....and it will be better than many new machines as far as snow moving goes. if you are handy with tools, even with the chute rod mods, its an afternoons work or less .
So it would be completely bolt-on then, with not other parts or dimensions affected? Sounds like a pretty good setup then.
As for impeller kit, are you talking about a rebuild or is there an upgrade you're recommending?
 

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Quality of materials, parts availability. At least on 90% of Tecumseh, most parts are available from every small equipment shop. But then again i dont like new briggs & straton engines either, but thats mostly because of epa


-efisher-
 

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Ya the chonda engines scare me, but they are gaining popularity


-efisher-
if the go cart and mini bike guys can do a few internal mods to them, and spin them up to 8000 rpms.......im in my comfort zone keeping it stock at 3600. ( i do want to turn the screw up to 3800-4000 tho :)).
 
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As far as the pulley, mine was 2.75 diameter. I went to 3in. The harbour fright predator eng is what i hear most about, so i would go with them over other chinees engines.


-efisher-
 

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As far as the pulley, mine was 2.75 diameter. I went to 3in. The harbour fright predator eng is what i hear most about, so i would go with them over other chinees engines.


-efisher-
.....and if you decide to go ^ that way...do some research and try to get your hands on the coveted hemi head version. and yes it is real......a hemi on your sb is possible lol
 

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Discussion Starter #17
I think maybe you guys are a bit more ambitious than I. :)
I'm not really looking to turn my blower into a 'Cuda anytime soon. Just biggest bang for time and buck. If the predator is a bolt on with the same size shaft and I can reuse all my parts with little modification, that works for me. Maybe I'll head down to HF and take a look.
 
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