Garden Power Tool Tips


● Gas / Oil mix ratio for 2-stroke engines
● Problem starting hedge trimmer, weed eater
● Hedge trimmer won't run


Gas / Oil mix ratio for 2-stroke engines

The gas/oil ratio for 2-stroke engines is generally 40:1 or 50:1 i.e. 2.5% or 2% oil.
50:1 is equivalent to 20ml in 1 liter or just over 2 1/2 US fluid ounces per US gallon. 
40:1 is equivalent to 25ml in 1 liter or 3.2 US fluid ounces per US gallon.
Consult the manual of the machine for details.

Problem starting Hedgetrimmer, Weedeater / Strimmer / Weed Whacker

Problems with engines not starting usually come down to either an electrical problem and no spark at the plug, or lack of fuel. Initially though, you should ensure that you are following a proper start-up procedure for the trimmer:

The procedure for starting an engine varies depending on the make and model of the trimmer but generally follows this sequence:

● Turn on start switch

● Prime the engine by pushing the primer button (if fitted) about 5 times

● Set the choke to on

● Repeatedly pull the starter rope until the engine starts, then allow the engine to run for about 5 seconds to warm up or until it cuts out

● Turn off the choke and squeeze the throttle trigger ( on some machines squeezing the trigger this automatically knocks off the choke) and you can start cutting

● If the engine cuts out, try pull starting it again with choke off, if this doesn't work after a few pulls, try turning the choke on again and pull start again

● If the engine still doesn't start allow a few minutes for any fuel in the cylinder to vaporize which may help starting

● When the engine eventually starts, remember to knock off the choke


If you still don't have any luck getting the trimmer started, it's time to start fault finding but remember to check the obvious first !

● Ensure you are using fresh gas, old gas is less volatile and may cause difficult starting.

● Check the throttle cable is actuating the linkages at the carburettor.

● Firstly check the high-tension lead to the spark plug isn't loose. Remove the spark plug and place the body of the plug against the engine so that it is grounded. Check there is a spark when the engine is cranked. If no spark, there may be a short circuit or crack in the white insulation part of the plug so temporarily try another plug to see if you get a spark. Don't actually use this in the engine unless it's the same time type as it may result in engine damage if it's too long. If this still doesn't work, there may be a problem with the cut off switch, which cuts the engine when the trimmer is switched off, if this is the case it may be necessary to strip the cowl off the top of the engine to trace the wire and switch.

● Ensure air filter is clean. Foam elements can be washed with hot water and detergent. Paper elements can be cleaned with compressed air blown from the inside of the filter but ideally should be replaced.

● Check fuel lines aren't kinked or blocked restricting fuel flow.

● Ensure fuel filter isn't dirty. This is probably located at the end of the fuel line in the tank.

● The fuel lines may have become airlocked.This can happen if the tank is run dry. If the trimmer has a primer bulb, alternatively press it several times and then try to pull start the engine with choke on. Repeat this several times. The primer bulb should feel spongy and fill with fuel.

● If you're up to it, you can dismantle the carburettor and clean any dirt from valves.The carburettors on chainsaws, hedge cutters, strimmers etc are very fiddly with delicate diaphragms, valves and springs so you have to be careful to avoid damage or loosing parts.

● There is usually a valve on the tank to allow air into tank to replace fuel as it leaves for the carburettor. Ensure this isn't blocked.

Hedge trimmer won't run

● Allow the engine to run for longer on the start setting before you switch to run (choke turned off)

● Ensure air filter is clean. Foam elements can be washed with hot water and detergent, squeezed dry in a cloth, and then rub about half a teaspoon of oil evenly through the foam. Paper elements can be cleaned with compressed air blown from the inside of the filter but ideally should be replaced.

● Check fuel lines aren't kinked or blocked restricting fuel flow.

● Ensure fuel filter isn't dirty. This is probably located at the end of the fuel line in the tank.

● The fuel lines may have become airlocked. This can happen if the tank is run dry. If the trimmer has a primer bulb, alternatively press it several times and then try to pull start the engine with choke on. Repeat this several times. The primer bulb should feel spongy and fill with fuel.Once the engine kicks, switch to run

● Ensure the choke is turning off ok when you rev the machine (automatic turn off choke)

● Ensure the carburettor is securely attached to the engine, gaskets are intact and there are no air leaks. This could prevent the carburettor sucking in fuel

1 comment:

  1. I have had many garden Power tools in the past and have been really impressed with the quality of them especially considering the price I paid for them, they are definitely something that I would recommend.

    ReplyDelete