Diagnosing a Small 4 Stroke Engine
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- Опубликовано: 11 июл 2024
- This video shows the systematic method of diagnosing a small 4-stroke engine, like a lawn mower or go cart engine. Thanks to subscriber Rein Ciarfella for the easy to remember acronym FACTS that stands for Fuel Air Compression Timing and Spark. Use that as a checklist in any order to go about diagnosing and fixing the problem.
For this engine, I truly did not know what the problem was. But compression was the culprit, so I had to figure out why a new engine had none. The fix was simple after eliminating other possibilities.
Watch as I go through the steps and get this one back up and running!
The video about Diagnosing and Replacing a Bent Woodruff Key is at • Diagnosing and Replaci... .
That one tip of dropping some oil into the cylinder really helped. I can get it started but it doesn’t idle
No idle usually means the carburetor. I'd recommend cleaning out the carburetor. 4 stroke carbs are easy. 2 stroke carbs are not too bad, but just more tiny parts. Use a twist tie to clean out the holes. This video might help: ruclips.net/video/okt3it-sVAk/видео.html
Thankyou for the great content. I've used all kinds of equipment but never learned how they work or how to fix them. Keep up the great work.
Cheers for the video. I just bought a old quad bike that’s been sitting for a couple of years. It’s got spark and fuel and I was worried about compression. I will give your little trick a try. Fingers crossed
best video i have ever seen
perfect, great instruction.
Brilliant! Nice job!
Great video!! 👏🏼
brilliant! very simple!
Thanks, the oil trick worked
Straight F.A.C.T.S
Curious if the oil trick is more of a temporary fix? Once burned up wouldn’t the lack of compression persist? Then i believe youd have to replace the compression rings because sometimes those can wear or their the gaps become aligned or a groove or ridge was present in the cylinder wall? What are your thoughts?
The dry cylinder is blue to the oil draining over the winter months. When it is being used the oil circulates in the engine and keeps the cylinder wet.
You would only want to pull the cylinder head and inspect the piston rings and cylinder walls after eliminating the easy tests. Cylinder & ring damage may be visible, but if not you’ll need to measure them against the specifications.
Good job why she keeps you around.
Hi, i have a 24.5cc 4 stroke yarkking and how about 50psi and with oil put in about 60 psi. Too low? and its eating oil so i guessing last owner wore it out a bit. engine is 2 1/2 years old. Already stipped it and ring gaps are only .25mm at top where gap should be widest so not too bad. No leaks and some oil from breather with air exiting. but shes eating about a teaspoon every 10-20 mins!!
Not an expert but 50 PSI is too low. Have you checked the valve seats? They can pick up a lot of carbon and not seat well, especially if it is burning oil.