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can someone share difference between setting the engine too rich or too lean? how can i tell if i didnt tune my engine right

Hey Max

If your engine is running lean some of the common symptoms are: Engine will die at full throttle, it will die just while idling and if you drop some water on the engine it will immediately sizzle. It means that its too hot.

If it set too rich there would be lot of blue smoke from exhaust pipe, it will never reach full speed and engine temperature will be too cold (below 200 F Degrees)

Hope this helps and let us know how you go, we might write an article about some tips on how to tune an engine.

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It really depends what emissions we’re talking about actually, i beleve its NOX (oxides of nit) that go up as running a lean mixture.. Other emissions may go up or down depending on what the mixture is.

But to answer the first question. Stochiometric mixture (14.7 parts air to 1 part fuel) As you know air is only has so much oxygen in it, which supports combustion, if you dont have enough air(oxy) to support the combustion the mixture is considered rich, too much fuel, not enough oxy to burn all the fuel.. Vice versa with the lean condition. Running lean also means running hotter, which has been said.. Just like a torch, you add oxygen and the flame can get 10x hotter then just a standard acetylene flame.

Jetting for carbs is what changes this mixture, different circuits for different throttle ranges.. Talk to people who ride snowmobiles in the mountains, we’ve gone to higher elevations and had to change jets just to get the sleds running decent, and not burning holes in the pistons..
At least with FI the ecm program can be changed quickly, changing pulse width and controlling fuel like that, all we need now is an 02 sensor to see what, if any oxy gen is coming out fo the exhaust..

ey Max

If your engine is running lean some of the common symptoms are: Engine will die at full throttle, it will die just while idling and if you drop some water on the engine it will immediately sizzle. It means that its too hot.

If it set too rich there would be lot of blue smoke from exhaust pipe, it will never reach full speed and engine temperature will be too cold (below 200 F Degrees)

Hope this helps and let us know how you go, we might write an article about some tips on how to tune an engine.

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