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#4515993 - 09/14/17 10:27 AM Tecumseh HM100 driving me nuts
andyd Online   content


Registered: 09/25/04
Posts: 7137
Loc: Marshfield , MA
New carb behaves like old carb. Engine starts gets warm, and starts popping back through the muffler.It will die in about 5 minutes If I start it on choke after it dies, it will die when I open the choke. Would a bent fly wheel key do this? Perhaps a stuck valve? The last time I messed with it was 5 yrs ago. If memory serves me, it was acting up then. I'm open to suggestions TIA
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#4516007 - 09/14/17 10:40 AM Re: Tecumseh HM100 driving me nuts [Re: andyd]
jeepman3071 Online   content


Registered: 04/15/10
Posts: 4209
Loc: Storrs, Connecticut
If a new carb didn't fix it I would check a few things:

-Flywheel key
-Coil/points are producing a good enough/constant spark
-Compression

I've seen a few of these with leaking valves causing issues. Sometimes the valve just isn't seating all the way and needs a little bit ground off the end so it closes.
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#4516016 - 09/14/17 10:44 AM Re: Tecumseh HM100 driving me nuts [Re: andyd]
JTK Offline


Registered: 08/14/03
Posts: 10559
Loc: Buffalo, NY
Does it run OK with the choke on?
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#4516042 - 09/14/17 11:10 AM Re: Tecumseh HM100 driving me nuts [Re: andyd]
zrxkawboy Offline


Registered: 11/30/04
Posts: 1761
Loc: SD
Originally Posted By: andyd
The last time I messed with it was 5 yrs ago.
The gas isn't 5 years old right?
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#4516045 - 09/14/17 11:16 AM Re: Tecumseh HM100 driving me nuts [Re: andyd]
meep Online   content


Registered: 02/20/07
Posts: 3549
Loc: Southeast
to me it sounds like it's either running lean (carb, intake leak) or there's a hot spot in the head. carbon buildup? warped valve? too little valve clearance? might pull the head and have a look....
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#4516046 - 09/14/17 11:17 AM Re: Tecumseh HM100 driving me nuts [Re: andyd]
meep Online   content


Registered: 02/20/07
Posts: 3549
Loc: Southeast
you could test for hot spots by running a tank of premium gas. if that helps, it's a hot spot issue. If it doesn't help, it's probably a mixture/leak issue.
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#4516065 - 09/14/17 11:36 AM Re: Tecumseh HM100 driving me nuts [Re: andyd]
andyd Online   content


Registered: 09/25/04
Posts: 7137
Loc: Marshfield , MA
Thanks guys.I have a blue spark. Gas is less than a month old. So,the coil is good. I have a fly wheel with a ring gear that I want to use, so I'll do that when I replace the key.
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1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

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#4516084 - 09/14/17 12:00 PM Re: Tecumseh HM100 driving me nuts [Re: andyd]
Kamele0N Offline


Registered: 02/09/15
Posts: 2038
Loc: Slovenia
Donyboy73 is very knowledgable guy!

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#4516202 - 09/14/17 02:46 PM Re: Tecumseh HM100 driving me nuts [Re: andyd]
emmett442 Offline


Registered: 12/07/16
Posts: 174
Loc: Wisconsin
Check valve clearance on the exhaust valve. I'll bet you can't even get a feeler gauge in there.
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#4516210 - 09/14/17 03:07 PM Re: Tecumseh HM100 driving me nuts [Re: jeepman3071]
Bgallagher Offline


Registered: 04/17/12
Posts: 3159
Loc: Boston, MA
Originally Posted By: jeepman3071
If a new carb didn't fix it I would check a few things:

-Flywheel key
-Coil/points are producing a good enough/constant spark
-Compression

I've seen a few of these with leaking valves causing issues. Sometimes the valve just isn't seating all the way and needs a little bit ground off the end so it closes.


+1 I was leaning compression or fuel related. How old is the fuel filter? I have a B&S that would die out when the engine warmed and wouldn't restart. Replaced the generic filter with a smaller one and have had zero issues since.
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#4516470 - 09/14/17 07:56 PM Re: Tecumseh HM100 driving me nuts [Re: andyd]
cronk Offline


Registered: 01/06/09
Posts: 1287
Loc: Watertown, New York
Some of those had a screen in the gas tank that can get clogged and cause fuel starvation. Check and make sure the cap is venting as well.
Could also be flywheel key or valve adjustment.

If it is a newer pointless electronic ignition, I have seen those get bad and start dropping spark as the engine warms up, but work fine cold.
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#4516634 - 09/14/17 10:55 PM Re: Tecumseh HM100 driving me nuts [Re: andyd]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Small engines need 3 key ingredients to run:

1. Fuel and air at the correct mixture ratio
2. Spark ignition at the correct time
3. Compression so that the piston pulls a vacuum when it travels downward

Out of those three, which one is the most likely to be a variable ?

Answer: The fuel and air mixture ratio

Carburetors bolt on, but they need adjustments as soon as the engine starts running.

If the carburetor has no provision for adjusting the mixture, then the main jet will need to be drilled larger until the mixture is rich enough for the engine to run smoothly.

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#4517024 - 09/15/17 12:22 PM Re: Tecumseh HM100 driving me nuts [Re: andyd]
andyd Online   content


Registered: 09/25/04
Posts: 7137
Loc: Marshfield , MA
I just ordered a coil. Despite having a decent spark when shorting out the loose plug, The way the exhaust pops is a rich mixture and a weak spark will cause that. If that doesn't fix it , I will dig further. Though the engine is 35 yrs old, it has less than 100 hrs on it. I think the low hrs would contra-indicate needing a valve grind.
_________________________
'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

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