I need a repair manual for a McCullough gas, 35 chain saw
I have replaced the spark plug, I need the fuel jet settings. The chain saw is aprox. 12yrs. old, has not be used a lot.
Thank you for any help anyone can give on this matter. Or info. regarding a repair manual.
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Not being facetious here... change the spark plug as a first step. They require regular replacement. If that doesn't work, use a multimeter to check that the spark plug wire is actually releasing electrical pulses. If it isn't, you'll need to keep moving further up the line to the coil.
this new gas is a carb killer you will need a new diaphragm for the carb and there is a little screan next to the needle and seat that can be cleaned. about a 5.00 repair if done right.. use marine gas
When I have a problem starting a saw this is what I do.
Remove the spark plug and pour 5 ml (one teaspoonful) of fuel into the opening
Dip the end of the sparkplug in fuel so the spark gap is wet
Replace the sparkplug and try to start the saw
The fuel that you poured in should ignite and may be enough to cause the saw to start. You may need to repeat the operation 2 or 3 times. Do not be tempted to put in too much feul as it will only flood the saw.
If the saw was left away with fuel in the carburettor for a few months the fuel may have formed a gel in the jets of the carburettor. If the above method doesn't solve the problem you'll need to have a mechanic strip down the carburettor and clean the jets.
Remove the spark plug and clean the electrode at the end where the spark jumps across the gap. Pour about 5ml (or one teaspoonful) of fuel into the opening, where the spark plug came out of. Dip the electrode end of the spark plug in the fuel so the spark gap is wet Replace the plug and try to start it.
The fuel you poured in the opening will burn and should get the saw going. You may need to repeat it 2 to 3 times. Don't use anymore than 5 ml of fuel or you'll just flood the saw.
When you were leaving the saw in storage did you just empty the fuel tank or did you let it run until it ran out of fuel. If you emptied the tank but did not let it run dry there would still have been fuel left in the carburettor. This is what causes the damage. If there was fuel left in the carburettor it will have formed a gel in the carburettor jets. If this happens the only way to clear them is to bring it to a mechanic who'll need to strip it down and clean the jets.
The fuel metering needle in the lower carburetor chamber may have a bad rubber tip or the rubber diaphragm may be hard or cracked. McCullough fuel tanks vent through the cap (it should not have a gasket). Gravity plays no part in the carburetor fuel volume. Remove the spark plug (ignition off) and pull the engine through a few times without the choke on, but the throttle wide open to remove excess fuel in the crankcase (no smoking during this procedure). Make sure the plug is dry when you put it back. Hope this helps!
Fuel starvation - 'lean fuel' condition
Basic things to check: 1) spark plug 2) spark arrestor in muffler 3) fuel lines and tank filter 4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn Chain Saws: 5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then: Remove Carburetor 6) replace gaskets/diaphragms a) use a spray carb cleaner to clean jets, holes, and body of carb b) fuel pump diaphragm goes against the carb body, then the gasket towards the outside c) metering gasket goes against the carb body, and the diaphragm goes towards the outside
It is running in a lean condition. Continued operation like that can cause piston and cylinder failure.
I'd take it in for repair estimate ($10) at the local chainsaw seller/mechanic. Explain the problem you are having, Probably a leaking fuel line. I'd expect a repair and tune up about $40-60. Your saw will perform better and your arm will thank you. If tuned ask what fuel/oil ratio they used (should be 50:1) and affix a label to your fuel tank. HTH
How old is the gas in the tank? If it has sat for a year in the tank or the can, the gas won't burn as easily because of octane breakdown. Mix in newly bought gas (with oil of course).
Pull the spark plug(s) and check the spark gap referring to your manual. If the gap is too wide, you'll have a hard time starting it. It's also a good idea to check how dirty your spark plugs are, and clean if necessary.
Depending on the age of the saw, if it's 35 years old or more, you may have to put less 2-cycle oil into your mix. The ratio has changed for all 2 cycle engines if they're approximately 35 years or older. Instead of 30 to 1 it's now 50 to 1.