Question about 2003 kawasaki Z 1000

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Motorcycle query. I am adviced that when i change my original muffler to an after market one the air/fuel mixture will become lean because of the 'freer' flowing of the new muffler. Thus i will require an expensive product called a 'power commander' to tune the air/fuel mixture accordingly. My bike is an 03 Z1000 and is fuel injected. No o2 sensor in the muffler or anywhere else along the exhaust.The mixture happens at the intake of the cylinders. Now why would the mixture become lean when the muffler is replaced just because it is now 'freer' flowing? What are the consequences of a leaner mix? Thanks, jody a

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There is no Back Pressure from a freer flowing muffler. These engines were designed with a certain amount of Back Pressure factored in. There IS a sensor in the system. The sensor, will read that the fuel/air mixture needs to be leaned out.

Leaning out causes hotter combustion area components. The combustion chamber in the head, the exhaust, intake valve faces, and seats, plus the spark plug electrodes.

The average temperature on a valve face can exceed 1600 degrees Fahrenheit. (Exhaust)
Excess heat will also cause lack of lubricity in-between the piston, and cylinder wall.
This causes galling of the piston sides, and cylinder walls.

Eventually everything 'freezes' inside, and your engine comes apart like an A-Bomb!

If you want to play, you have to pay. Either have a tuner do it regularly, or buy the tool, and learn how to use it. (Or go back to the stock mufflers)

Posted on Jul 25, 2009

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The reason why the engine is burning lean to begin with is that the reduction in backpressure is causing more air to be drawn into the combustion chamber than before. This means the mixture is lean and results in overheating of exhaust valves and seats.

Your engine PCM will be able to adjust for slight changes in backpressure on the exhaust, but not enough to compenstate for the difference a peformance exhaust will make.

You engine will wear at a faster rate if it runs leaner than normal.

Posted on Jul 25, 2009

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It sounds like your bike's fuel-air mixture is too lean. Lean fuel-air mixtures causes the engine to spit back through the intake and surge at the speeds you're talking about. You cannot maintain a steady speed at about 40 mph. I'm sorry but I know nothing about fuel injection systems. I suggest that you take your bike to a shop that has a dynometer and an exhaust gas analyzer. They can run your engine up through the complete rpm range and check the fuel-air mixture throughout the range. They should be able to make the changes necessary to get your bike running correctly.

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After little,but hard use smokes and becomes extremely hot , too hot to handle then takes an age to cool down. When hot , difficulty in reverse mode.


sounds like your mix may be too lean on oil ?

if so could have damaged saw , remove muffler check piston

could be running lean mixture ie carb setting too lean or a air leak particularly if your settings have not changed

air leak will lean out mixture and make it run very hot , seem to run away under load

check fuel lines and fuel filter , check for loose carb mountings and manifolds / split intake boot, loose barrell to c/case bolts

i would be vey suspicious of a air leak , check carefully
check piston as well could quite possibly be scored / damaged

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