Have this tecumseh h50 I bought about 3 weeks ago.I got it running real good to my standards about a week ago. One day I took off some of the metal plates and just painted them black.I would also upgrade the fuel lines(Same lines but added a shutoff and new filter).I put all the plates back on and now the engine surges really bad.It would always surge about 20 minutes into running,I would just turn off the engine and start it back up no problem.This engine is on a minibike(Previously on a woodsplitter)Has a clean carb,vented tank,bowl and lines are filled with gas,and gas is fresh.Im blanked and have no idea what could be the reason.Any ideas?
H50 Tecumseh surging when given throttle?
- Thread starter DKR15go
- Start date
JTK
$100 Site Donor 2025
Sounds like a plugged carb jet. Is it the original carb on it? I'd hang on to the OEM and order a replacement to try.
JTK
$100 Site Donor 2025
It's super common for the jets to get tiny bits of corrosion or debris in them. Lots of good youtube videos on how to disassemble and clean them with a set of torch head cleaners, etc. The OEM carbs are the best, and worth tinkering with. They are tough to find now given Tecumseh has been gone for so many years. If it's a generic aftermarket carb you have, I'd just order another one.
That does sound like a lean-surge.
I would get a new aftermarket carb and hope for the best. I had to get 2 before one worked. At less than $20 it's a gamble I'll take
A guy around the corner from me works on small engines and showed me a neat trick. Some jets have 3 holes some 2, not really sure why. He went to a welding supply store and picked up a welder tip cleaner tool. He runs that through the jets to make sure they're clear of debris or corrosion.
When you installed the fuel shut-off valve and fuel filter you generated some garbage from inside the fuel hose that ended-up in the carburetor and partially plugged a jet or fuel passage. The carb will need to be cleaned again paying special attention to clearing the jets and passageways of debris. These can be cleaned-out with a fine steel wire like the stiff wire found inside of twist ties (my favorite because they are free and readily available) or a welding tip cleaner as JTK and 97prizm suggested, then sprayed out with carb cleaner.
I did mess with the flywheel and coil.I added a little coil just to power some lights underneath the flywheel.I didn't think it would cause a problem.You think this could be a reason?
My guess is the fuel delivery. Since you changed the fuel filter, did you use an automotive type one? They tend to be more restrictive. Is the fuel line routed so there are no low spots with good slope between the tank and carb?
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