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E. CHAIN TENSION
• Correct chain tension is very important:
--a loose chain will wear the bar and itself.
--a loose chain can jump off the bar while
you are cutting.
--a tight chain can damage the saw and/or
break.
3. Continue turning the Adjusting Screw until
the tension is correct.
4. Hold the tip of the Guide Bar up and tighten
the Bar Clamp Nuts with the Scrench.
5. Recheck tension.
• Chain tension is correct when the chain:
--can be lifted about 1/8" from the Guide Bar
at a point near the middle of the bar, and
--will move freely around the bar.
..• The chain stretches during use, especially
=
when new. Checktension:
-- each timethe saw isused
-- more freduently when the chain isnew
-- as thechainwarms upto normal operating tem-
perature
• The Bar Clamp Nuts must be slightly loose,to
tension the chain correctly.
1. Hold the tip of the Guide Bar up and turn the
_djusting Screw just until the chain does not
sag beneath the Guide Bar.Figure 14.
NOTE: Turn screw clockwise to tighten ten-
sion. Turn screw counterclockwise to loosen
tension.
2, Check the tension by lifting the chain from
the Guide Bar at the center of the bar. Figure
15.
TURN
TO LOOSEN
TENSION
TU RN
TO TIGHTEN
TENSION
Figure 14
CHAIN CAN BE _ \
LIFTED 1/8" WHEN fJ_
TENSION IS f .
co..ECT.13,-/
Rgure 15
F. ENGINE FUEL MIXTURE
• Yourchain saw ispowered bya two-cycle engine
which requires a fuel mixture of regular,
unleaded gasoline and a high quality engine oil
specially made for 2-cycle, air-cooled engines.
The internaldesign of the 2-cycle engine requires
lubricationofmoving parts. Lubricationis provided
when youusetherecommendedmixtureofgasoline
and oil.
Gasoline must be clean and not over two
months old. After a short period of time,
gasoline begins to chemically break down
and will form compounds that can cause hard
starting and damage in 2-cycle engines.
1. USETHE FOLLOWING FUEL MIXTURES:
2. DO NOT USE:
• BIA Oil (Boating Institute of America)
--Does not have proper additives for air-
cooled, 2-cycle engines and could cause
damage.
• The correct measure of gasoline to oil is very
important.
--Too much oil in the mixture will foul the
spark plug.
--Too little oil will cause the engine to over-
heat resulting in damage.
• Mix the fuel thoroughly in a container since
gasoline and oil do not readily combine. Do not
try to mix fuel directly in the fuel tank.
• AUTOMOTIVE OIL-
- Does not have proper additives for 2-cycle
engines and could cause damage.
• GASOLINE CONTAINING ALCOHOL-
(High Test, Premium or Gasohol)
-- Stiffens critical carburetor fuel metering ele-
ments and causes engine damage from
overheating.
-- Increases vapodock (causes hard starting).
-- Attracts water causing corrosion damage.
9
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