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Tecumseh HS50 help

4770 Views 6 Replies 7 Participants Last post by  dodge trucker
I am working on a HS50 (5hp) Tecumseh on a MTD snowblower for a friend. It has been setting since last winter and when he went to get it ready for use this year it was leaking gas at the carb. I removed the cover and found it had a hole in the gas line. Replaced the line and thought all was fine. Then found out it had no spark. Points and condenser (inside flywheel) later and I had spark. Then had to remove and clean carb. (Found out he had let it set outside in the weather all summer.) I have gotten the engine to run, but the problem is it will only idle, if you try to advance the throttle it wants to die. It will only start at idle and will run about 1 minute then die. What am I doing wrong or what have I missed.
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Try adjusting the fuel mixture screw on the float bowl. Finger tighten the screw and then back it off about 3 turns.


Also, have you gapped the points to .020" ?
In addition to opening the screw a tad, did you remember to clean all the holes in it when you cleaned the carb? It probably has 2 big ones and 1 tiny one.
You have an obstruction in the "high speed circut" The engine will idle just fine because it is getting fuel through the low speed circut.

Think of it like like a freeway.... you can drive down the right hand lane, but you get get on the express lane because there is an "obstruction" aka accident so until you clean the high speed nozzle and jet you will continue to have this problem.

I have said this many times before, always check on the price of carb replacement BEFORE starting a rebuild. Many times you can get a new replacement carb for under 50 bucks retail. More times then not you end up trying to put a kit in the carb only to find out a couple hours later you need to still replace the carb.

Sometimes no matter how hard you try to clean the carb it just wont work right.

In your case however..if you would replace the high speed nozzle and adjut it out about 1 1/2 turns you should be able to run your engine at high speed. It may hunt and surge, which is yet another problem.

FWIW... No fire on these and the 6.0 hp series is often an indicater that the magnets have fallen off inside the flywheel.
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Make sure there is no water left in the fuel tank as well. Techys are very tempermental if any excessive moisture is present.
I have had a few Tecumsehs that would die out when accelerated ,and it wasn't the carb to be blamed,it turned out the coil was weak--I tried reducing the spark plug gap to .015 0r .020 and it would rev right up after I did that--but they idle rather "lumpy" with that small a plug gap....

I replaced the magneto with a good used one, and put the plug gap back to .030 and it ran great again...after wasting a day trying 3 different "good" carbs that ran great on other engines...I thought sure it was fuel related..I've had other engines that stumbled on acceeration that I switched to a car coil,and the "bog" dissapeared on them also..
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I just bought POINTS nd CONDENSER for a Tec HS50 yesterday; $13 for JUST THE POINTS! said Genuine Tecumseh" on it but they came from taiwan the Genuine condenser was $5-something... and US made; the points looked like no other Tec points i have ever seen; I am worried about them lasting; there was a burr on the rubbing block and I could see daylight betweeen the rubbing block and the slip on cam on the crank that opens the points.
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