The correct carburetor adjustment will allow the saw to produce maximum power, extend the duty cycle of the engine, produce minimal smoke, idle smoothly, rev up nicely and give trouble free service. High Speed Fuel Adjustment – This is the adjustment that controls the proportion of fuel in the combustible air/fuel mixture at cutting speed. If carburetor adjustment is required due to a new or rebuilt carburetor, it is best to start with the fuel adjustment settings one turn out.
If you have a new saw, this won’t apply to you, as new regulations require saws to be built so that only a qualified technician can tune the carburetor. If you have an older saw, here’s how to quickly tune it yourself. Less than five minutes of your time can make a big difference in how well your saw runs.
“I have 12 chainsaws. I do not use an RPM tack. because I don’t consider any of them to be accurate except the ridiculously priced ones.I never hold a chainsaw wide open for more then enough time to just reach max RPM. When I find that RPM, I slightly richen the mixture-about 1/8-1/4 turn, and then check in the cut.With any two cycle engine, it is critical that you have the correct wide open adjustment that looses RPM but runs cleanly during the cut. When lifting the saw out of cut, you should witness a”fluttering-4 cycling sound. Focus on rpm under load, not while screaming with no load. The target no load RPM on that saw is 13000. Letting the saw get to operating temperature and tuning it a few hundred RPM below max WOT to allow for differences in fuel is pretty simple.
If your chainsaw is over-revving, it indicates a lean air-fuel mixture is supplied to the engine. Loosen the screw until the chain stops revving without the trigger pressed with the engine on. If you ask an expert, the number one factor behind the chainsaw surge is the engine running lean.
It would not be accurate to say this is the most important setting, because all of these adjustments need to be accurate for a saw to perform its best, but this is the adjustment that determines how the saw runs in the cut. If you adjust your saw with a dirty air filter, the saw will run too lean when the filter is cleaned. If proper adjustment for your saw is outside the limited range, take your saw into a shop.
how high does a chainsaw rev Related Question:
What RPM does a chainsaw run at?
Depending on your saw, the reading should be between 10,000 and 14,000 rpm. That’s a wide variation, and so it’s important to look up the maximum speed of your saw before conducting this test. The engine should never run faster than the maximum speed at which it is designed to run.
Can you over rev a chainsaw?
A chainsaw optimal cutting speed can ease up the cutting performance and save time. But as they say, “excess is bad,” an over-revving chainsaw can be dangerous to operate and is likely to cause an engine seizure.
How many RPM is a gas chainsaw?
Pull the throttle trigger, run the chain saw at full speed and note the tachometer reading. Depending on your saw, the reading should be between 10,000 and 14,000 rpm.
Why does my chainsaw rev too high?
The throttle valve (butterfly) simply cuts off the supply of combustible air/fuel and the engine stops. If this adjustment is set too high, the high idle speed will cause the centrifugal clutch to engage and the chain will run. This is a dangerous condition and should never be allowed.
Can a chainsaw cut through bone?
Bones may be slightly tougher, but they are rigid and a chainsaw will likely be able to cut through them without much problem – though it will probably dull the blade more than wood.
How do you use a chainsaw tach?
Record the engine speed with the tachometer. Look up your chain saw’s maximum safe speed in the operator’s manual. If the tachometer reads more than that speed, turn the “H” screw counterclockwise until the speed falls below the maximum safe speed value.
Can you rev chainsaw with brake on?
Running a chainsaw with the brake on can be dangerous for you and anyone in your vicinity. The chainsaw will not cut, but it still creates sparks that can cause fires or startle nearby pets. It also doesn’t allow the saw to cool down enough which increases the likelihood of overheating and breaking down.
Should you let a chainsaw warm up?
The gas engine in a gas chainsaw should warm up, but due to the engine’s small size, this will happen quickly. Normally the engine will run for a short time after startup before you really start using it, giving the oil enough time to warm up and lubricate all engine parts.
How hot do chainsaws get?
How Hot Does A Chainsaw Crankcase Get? The oil conductor does not provide sufficient heat protection to keep the engine cooler; instead, the oil is more efficient at drawing heat to it instead. At temperatures over 220 Fahrenheit and occasionally as high as 220F, it often stratifies on top of an oil pan.
Why does my chainsaw cut out when revved?
If the filter becomes clogged, not enough fuel will reach the engine for it to run properly. Because your chainsaw will idle, but dies when it is revved up to full power, it means that the filter is only partially clogged; it will allow enough fuel to the engine to run on idle, but not enough to sustain full throttle.
Why does my chainsaw bog down when I give it gas?
If your chainsaw is bogging down when you give it throttle, this is often a sign of improper gas-to-oil ratio. If there is too much gasoline in relation to the amount of oil used, this is known as a “rich mixture” and can cause the chainsaw to run poorly.
Can chainsaws cut through nails?
If chainsaw teeth occasionally come in contact with a nail hidden inside the wood, it can cut through the nail but not without consequences. Every time your chainsaw accidentally cuts a nail, this metal-on-metal contact will cause the chainsaw’s teeth to become dull prematurely.
Does Stihl make a tachometer?
Stihl 5910-850-1100 – Tachometer Edt 9.
Why do chainsaw chain dull so quickly?
Is the wood that you’re cutting with the chainsaw particularly dirty? Many chainsaw enthusiasts have noted that their blades dull faster when they’re cutting muddy wood. If the logs that you’re cutting up are muddy, then perhaps that is the sole reason why your blade is dulling too fast.
Can you cut tree roots with a chainsaw?
Once you’ve sliced the stump almost all the way to the ground, continue cutting it — and the soil — diagonally and at different angles. Don’t go more than a foot into the soil. Chainsaws are powerful machines, and you don’t have to worry about dirt damaging it or knocking the chain off.