Question about McCulloch Fuel Gas Cap With Gasket 600 605 610 650 300 3.7 Timber Bear
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Posted on Jan 02, 2017
There are no hard and fast settings.
A good initial starting point for the "H" and "L" needle valves are 1.5 turns CCW from lightly seated.
The "T" adjustment enters here (idle speed) and there is no initial setting without a tachometer, depending on age of your saw there may not be any initial "T" setting.
The "L" needle is primarily idle performance (not speed) and acceleration to full throttle.
The "H" is mostly performance at speed, but all are interconnected.
Start with a fresh mix of fuel. Put ALL of the old mix in any 4 cycle engine and start new. I suggest 50:1 regardless of what your manual says.
• CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; once marred adjustments are difficult to impossible to set properly.
• Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.
• Clean the spark arrestor and muffler; if the saw cannot exhale it cannot inhale.
Now we adjust for performance. The best performance adjustment procedure I have found follows.
Madsens Shop & Supply, Inc. Carburetor adjustment (All saws homeowner and professional are the same)
http://www.madsens1.com/saw%20carb%20tune.htm Read step 4 (allow it warm before making adjustments).
• There are 2 wav (sound - idle & full - may not be highlighted) files that I find most helpful, I think you will too.
I am going to inject a little philosophy here. Undetected air leaks and defective fuel delivery systems account for most chainsaw failures. Constant adjustment of needle valves can easily camouflage more serious problems that result in burning up your saw. A sudden need for an adjustment is often indicative of a larger problem.
If push comes to shove a local saw shop (I prefer Stihl mechanics and do not own a Stihl) should be considered.
If you have more questions or need additional help please reply below and I will get back to you. HTH & Good Luck.
Thank You for using FixYa.
Posted on Jul 09, 2010
between 32:1 and 40:1 - Manufacturer recommends 40:1 Ratio - EXAMPLE: "Mix 3.2 ounces of Poulan 2-cycle air cooled engine oil to one gallon of fresh unleaded gasoline to obtain the recommended 40:1 fuel to oil ratio."
Posted on Sep 02, 2010
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