Home-owner's Chainsaws


This type of saw is Very Dangerous because there is  no practical way to make a guard for the cutting teeth. 

So the bottom line is: "Read, Understand, and Follow  the manufacturers Safety instructions at all times".

And be sure to read ourDisclaimer

 

These two Chainsaws are made for the Home-owner,  to be used for trimming trees and cutting firewood. Home-owner Chainsaws may have Bars up to 16" and engine displacement up to 40cc.

They are low-priced Chainsaws and not meant for daily use in a wood lot. You may find them on sale for $100.00 or less.

Electric Chain saws are quieter and may be better suited for use by Women and in areas with neighbors nearby. They are lighter and don't require pull-rope starting or mixing oil with the gas. 

But they often lack the power of many Gasoline models, and have the nuisance of a trailing Electric Cord begging to be cut off.


Features:

You may desire certain features which some gasoline Chainsaws have and others do not. Older used Chainsaws may have very few features. Features tend to raise the price.

Bar length: 12" - 48" 
Determines how big a log you can cut. Theoretically, a 14" bar should be able to cut a 28" diameter log. But in reality, it will most likely be very under powered for the task. It is more realistic to limit a 14" bar to a 12" diameter log.

Displacement: 30cc - 120cc (2- 8 HP.)
This is the term used to measure the amount of air space in the Cylinder when the Piston is down. The larger this space, the more air it can hold, the more gas can be mixed with the air, and the larger will be the explosion.

Automatic Brake:
This feature is pretty common now. A Lever mounted in front of the operator's wrist stops the chain in case of a "Kickback".

Kickback Nose:
This device is mounted on the front of the Bar to make it more difficult for a Chainsaw to violently kick back toward the operator. Some experienced operators consider it a nuisance.

Weight: 9 - 20 pounds.
This is  a big deal !  If you opt for a heavy Chainsaw, you'd better eat your Wheaties. After several hours of cutting, arms exercised on a Computer Keyboard will feel like they're about to fall off.

Vibration Damping:
Some Chainsaws have Springs or Rubber Grommets between the handles and the engine to minimize vibration in your arms.

Easy-Starting:
Compression Release or other methods make it easier (and safer) to pull the Starting Rope.

Automatic Bar-Chain Oiler:
Manual oiling of the cutting Chain and Bar depends on the operator to push an oiling device. An Automatic system which constantly feeds Chain Oil to the Bar is convenient and more dependable, which should prolong the life of these parts.

Bar Sprocket:
This Chain Sprocket on the nose of the Bar has become pretty standard, but some cheap Chainsaws may still lack this feature.

Chain Adjustment:
Chain adjustment is usually done by loosening several Nuts, then turning a Screw or Bolt, and retightening the Nuts.  A new feature is the ability to tighten the Chain without using any tools, which are easily misplaced or lost.

Fill Locations:
Some chainsaws (like the two above) have the Gas or Oil Fillers at a location that makes access difficult, inviting Gas or Oil spillage.

Choke-Start Switch:
A convenience is one Switch which controls both Choking and Acceleration; as opposed to this sort of method:
 

The 2 Chainsaws shown above have these very precise starting instructions:

(1) - Turn on Switch
(2) - Turn on Choke max
(3) - Press Primer Bulb 10 times
(4) - Lock Throttle "ON"
(5) - Pull Starter Rope 4 times 
(6) - Move the Choke to mid-position
(7) - Pull Starter Rope 4 times - Engine should start
(8) - After 10 seconds, release Throttle Lock
(9) - Turn Choke "OFF"
 . . . . . Saw wood


SAFETY: not enough can be said
Not only can you be injured by the obvious sharp speeding Chain, but less obvious dangers are lurking: 

ALWAYS wear tough Leather Gloves . They will help protect you from the sharp chain, the hot exhaust, and the splinters, scrapes, and bruises associated with Firewood.

High Leather Boots will help protect your feet, ankles and shins from moving logs and Firewood. Their traction soles will also help you maintain good footing when working on uneven or stony ground. The last thing you want is to lose your footing while holding a running chainsaw.

A Full Face Shield is the best eye protection you can wear, and it will also help prevent flying chips from getting inside your shirt. 

Ear Plugs or Ear Muffs which muffle the sound and protect your hearing.


Chainsaws usually have "2-cycle" Engines, which are lighter and more powerful-per-pound than are "4-cycle" Engines. A "cycle" is considered to be one complete directional movement of the Piston within the Cylinder.

When the Piston goes down, it is considered a cycle. When it goes back up, it is considered a second cycle. So down-up= 2-cycle, and down-up-down-up= 4-cycle.


When the 2-cycle Engine on the left has its Piston go down, it sucks gasoline in from the Carburetor. 

When it goes back up it closes the fuel port from the Carburetor, discharges exhaust through the exhaust port, closes the Exhaust Port, and compresses the Gasoline mixture. Then the spark Plug fires, explodes the gasoline, and forces the Piston back down which sucks gasoline in again. 

The inefficiency of a 2-cycle Engine comes from the fact that gasoline enters the Cylinder while the Exhaust Port is still open. This allows some of the gasoline to escape. This waste is minimized by the upward protrusion on the head of the Piston which limits the gasoline going straight across the Cylinder, and out the Muffler.



 

In the 4-cycle Engine there are mechanical Valves that are opened and closed by a rotating shaft which has cam lobes on it. In the graphic above,  the Exhaust Valve is open allowing exhaust to escape out the Muffler.

This is the 4-cycle sequence:

1 - The Piston moves down, the Intake Valve opens admitting gasoline from the Carburetor, the Intake Valve closes.

2 - The Piston moves up compressing the gasoline, the Spark Plug fires and explodes the gasoline.

3 - The Piston is forced down by the explosion.

4 - The Exhaust Valve opens. The Piston moves up, pushing out the exhaust. The Exhaust Valve closes.

The 2-cycle Engine does not have the weight or complexity of a valve "train" or of a lubrication system. But that makes it necessary for the operator to mix  2-cycle oil with the gasoline. Plain gasoline will damage these Engines!

The usual mix is about 3 ounces of 2-cycle oil to 1 gallon of gasoline. The burning oil is why Chainsaws tend to smoke so much. Some operators use only Synthetic 2-cycle oil, which minimizes the smoke. It has been rumored that some Synthetic 2-cycle oils may also extend the life of the Engine.

Storage: You should not mix more 2-cycle gasoline than you expect to use in a month. And if you plan to store your Chainsaw for longer periods, you should remove the Spark Plug and put a teaspoon of 2-cycle oil in the Spark Plug hole. Then slowly pull the Starter Rope to coat the moving parts with a film of the oil before you replace the Spark Plug.

Trouble: Too much oil in the Gasoline will cause the Spark Plug to "foul" and make your Engine erratic. If you have Chainsaw trouble, click HERE.

The inconvenience of having to add 2-cycle oil to the gasoline is outweighed by the power and lightness of 2-cycle Engines, which keeps them the prime candidate for Home-owners Chainsaw power.
 
 

Those tiny cans of 2-cycle oil
that get  dumped into a gallon
of gasoline cost about $1.40 
for a 3-ounce container. 
That's about $15.00 a quart ! !

Next time - 
open that tiny container, check how full it is; use it and then cut the top off at the oil line. Then buy a QUART for about $2.00 and use the cutoff teenie $1.40 can for a measure . . . and save $13.00.

Then you can take the $13.00 you saved and order Goodies from us. 


 
 


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