13
Now turn the adjusting needle in (clockwise). The
engine speed may increase, then it will decrease
as the needle is turned in (lean). Note the position
of the needle.
Set the adjusting needle midway between the rich
and lean settings. See Figure 14.
Figure 14. Optimum Low Idle Fuel Setting.
Troubleshooting
When troubles occur, be sure to check the simple causes which, at first, may seem to obvious to be considered.
For example, a starting problem could be caused by an empty fuel tank. Some common causes of engine troubles
are listed in the following table.
Do not attempt to service or replace major engine components, or any items that require special timing or
adjustment procedures. Have your Kohler Engine Service Dealer do this work.
Will Not Start ••• ••••
Hard Starting •• ••••
Stops Suddenly • •••••
Lacks Power •••••••
Operates Erratically ••• • ••
Knocks or Pings •• • •
Skips or Misfires ••• ••
Backfires ••••
Overheats •••••
High Fuel Consumption •••
Lean
Rich
Adjust to
Midpoint
3. Low Idle Speed Setting: Place the throttle
control into the “idle” or “slow” position. Set the
low idle speed to 1200 RPM* (± 75 RPM) by
turning the low idle speed adjusting screw in or
out. Check the speed using a tachometer.
*NOTE: The actual low idle speed depends on the
application – refer to equipment
manufacturer’s recommendations. The
recommended low idle speed for basic
engines is 1200 RPM. To ensure best
results when setting the low idle fuel
needle, the low idle speed must not
exceed 1200 RPM (± 75 RPM).
Possible Cause No Improper Dirt In Dirty Incorrect Engine Dirty Air Faulty
Problem Fuel Fuel Fuel Line/SystemGrass Screen Oil Level Overloaded Cleaner Spark Plug
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