Rich vs Lean Running Engine | How to Diagnose Rich and Lean Fuel Mixtures | Lean and Rich Symptoms

How can you tell if your motor is running too rich or too lean?
In this video from Partzilla.com, John is walking you through the differences in the symptoms of a motor running too lean and the symptoms of a motor running too rich. But first, a little explanation.
For the purposes of our discussion here, we’re just talking about carbureted engines. And all rich or lean really means is what side of the stoichiometric ratio your motor is running. If your motor is in the middle, it will have just enough fuel and air to mix together to fully ignite all the fuel without air left behind. And what’s that magic number? 14.7 parts air to one part fuel.
More air? Too lean. More fuel? Too rich.
So what are the symptoms of an engine that runs rich? John will explain how acceleration, conditions where you ride, and the appearance of the exhaust pipe and spark plugs can tell you a lot.
What about the other side of the coin? What are the signs your motor is running too lean? Again, you’ll find some hints in how your machine accelerates, how and when it backfires, and whether it runs better in heat or in the cold. You’ll also see some hints in your exhaust and your spark plugs.
Find out more about engines running lean or rich here: www.partzilla.com/blog/motorc...
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[@Rocket39Smoke14]

Can't wait for the Non-carbureted version video...

[@brandonstews238]

Lean is mean and costs you the green! Error on the side rich!

[@PartzillaParts]

You're a poet and don't know it.

[@_Wai_Wai_]

@@PartzillaParts Heh... so are you.

[@jessemurray2236]

I have symptoms of both lean and rich
Uneven acceleration & bogs - rich
Surging at 1/4 throttle - lean
Runs better cold - rich
Backfires as loud as a rifle - lean
Spark plug a little black but looks normal
No smoke
A little bit of soot in the valves
Carburetor has the slide needle dropped all the way down
I’ve been chasing these symptoms for 9 months now and haven’t found the issue
Did a carb clean, replaced the petcock, new air filter, spark plug, the motor is hardly broken into. 3,900kms, so the jets in the carb are brand new and clean.
The motor is in time as well
I took it to a few mechanics and they don’t even know what’s wrong

[@aldraway]

👍🇸🇦

[@germanaeveretts4591]

"promo sm" 🔥

[@golfcon]

My exhaust smells like rotten eggs especially on startup