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Tecumseh HM100 driving me nuts #4515993
09/14/17 09:27 AM
09/14/17 09:27 AM
Joined: Sep 2004
Posts: 7,821
Marshfield , MA
andyd Offline OP
andyd  Offline OP
Joined: Sep 2004
Posts: 7,821
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


'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
Re: Tecumseh HM100 driving me nuts [Re: andyd] #4516007
09/14/17 09:40 AM
09/14/17 09:40 AM
Joined: Apr 2010
Posts: 4,559
Storrs, Connecticut
jeepman3071 Offline
jeepman3071  Offline
Joined: Apr 2010
Posts: 4,559
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.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (36k) - Castrol Edge Euro 0w40, MANN HU816X
Re: Tecumseh HM100 driving me nuts [Re: andyd] #4516016
09/14/17 09:44 AM
09/14/17 09:44 AM
Joined: Aug 2003
Posts: 11,013
Buffalo, NY
JTK Offline
JTK  Offline
Joined: Aug 2003
Posts: 11,013
Buffalo, NY
Does it run OK with the choke on?


2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)
Re: Tecumseh HM100 driving me nuts [Re: andyd] #4516042
09/14/17 10:10 AM
09/14/17 10:10 AM
Joined: Nov 2004
Posts: 1,859
SD
zrxkawboy Offline
zrxkawboy  Offline
Joined: Nov 2004
Posts: 1,859
SD
Originally Posted By: andyd
The last time I messed with it was 5 yrs ago.
The gas isn't 5 years old right?


"Think of all the Ford owners who will someday want an automobile." John Dodge

Re: Tecumseh HM100 driving me nuts [Re: andyd] #4516045
09/14/17 10:16 AM
09/14/17 10:16 AM
Joined: Feb 2007
Posts: 3,700
Southeast
meep Offline
meep  Offline
Joined: Feb 2007
Posts: 3,700
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....


2018 F150
2015 crv (wifey!)
Re: Tecumseh HM100 driving me nuts [Re: andyd] #4516046
09/14/17 10:17 AM
09/14/17 10:17 AM
Joined: Feb 2007
Posts: 3,700
Southeast
meep Offline
meep  Offline
Joined: Feb 2007
Posts: 3,700
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.


2018 F150
2015 crv (wifey!)
Re: Tecumseh HM100 driving me nuts [Re: andyd] #4516065
09/14/17 10:36 AM
09/14/17 10:36 AM
Joined: Sep 2004
Posts: 7,821
Marshfield , MA
andyd Offline OP
andyd  Offline OP
Joined: Sep 2004
Posts: 7,821
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.


'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
Re: Tecumseh HM100 driving me nuts [Re: andyd] #4516084
09/14/17 11:00 AM
09/14/17 11:00 AM
Joined: Feb 2015
Posts: 2,361
Slovenia EU
Kamele0N Offline
Kamele0N  Offline
Joined: Feb 2015
Posts: 2,361
Slovenia EU
Donyboy73 is very knowledgable guy!



2008 Toyota Yaris 1ND-TV 1.4 D4-D Elf FullTech FE 5w30
1997 Toyota Landcruiser KZJ95 3.0 TD Shell Rimula R6M 10w40
Re: Tecumseh HM100 driving me nuts [Re: andyd] #4516202
09/14/17 01:46 PM
09/14/17 01:46 PM
Joined: Dec 2016
Posts: 202
Wisconsin
emmett442 Offline
emmett442  Offline
Joined: Dec 2016
Posts: 202
Wisconsin
Check valve clearance on the exhaust valve. I'll bet you can't even get a feeler gauge in there.


2011 Ford Crown Victoria LX 4.6L V8 auto
2009 Chevrolet Malibu LT 2.4L I4 auto
1974 Dodge D200 360 V8 4 speed manual
Re: Tecumseh HM100 driving me nuts [Re: jeepman3071] #4516210
09/14/17 02:07 PM
09/14/17 02:07 PM
Joined: Apr 2012
Posts: 3,159
Boston, MA
Bgallagher Offline
Bgallagher  Offline
Joined: Apr 2012
Posts: 3,159
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.


2017 Chevy Traverse - 28k - Delco Dexos 1 and PF63
2014 Chevy Equinox - 22k - Delco Dexos 1 and PF457G
2015 GMC Terrain - 22k- Delco Dexos 1 and PF457G
Re: Tecumseh HM100 driving me nuts [Re: andyd] #4516470
09/14/17 06:56 PM
09/14/17 06:56 PM
Joined: Jan 2009
Posts: 1,326
Watertown, New York
cronk Offline
cronk  Offline
Joined: Jan 2009
Posts: 1,326
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.


2008 Ford F350
2003 Chevy Cavalier
2011 Nissan Quest
1986 Pontiac Trans Am
1940 Ford 9N Tractor
Amsoil lubes and filters!
Re: Tecumseh HM100 driving me nuts [Re: andyd] #4516634
09/14/17 09:55 PM
09/14/17 09:55 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
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.

Re: Tecumseh HM100 driving me nuts [Re: andyd] #4517024
09/15/17 11:22 AM
09/15/17 11:22 AM
Joined: Sep 2004
Posts: 7,821
Marshfield , MA
andyd Offline OP
andyd  Offline OP
Joined: Sep 2004
Posts: 7,821
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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