![](/images/new-backgrounds/1111475/11147553x1.webp)
3 |
| Fuel system | ||||
|
|
| When checking the speed on a |
|
| |
|
|
| NOTE! |
| ||
|
|
| trimmer no part of the cord |
| ||
|
|
| A tachometer should always be used to find the optimal |
| ||
|
|
| should be extended. |
| ||
|
|
| Use the 502 71 | setting. |
| |
|
|
| The recommended max. speed must not be exceeded. |
| ||
|
|
| eter to check the speed. |
| ||
502 71 |
| • Carefully screw in (clock- |
|
| ||
|
|
| ||||
| wise) the L- and |
|
| |||
|
|
| Idling speed | |||
|
| |||||
|
|
| they bottom. Now screw out | |||
|
|
| ||||
|
|
| (anticlockwise) the needles | Let the engine idle for about 30 seconds or until the speed has | ||
|
|
| 1 turn. The carburettor now | stabilised. Adjust the idling speed | ||
|
|
| has the setting H = 1 and | idles without stopping. | ||
|
|
| L = 1. | • Turn the screw clockwise if the engine stops. | ||
|
|
| Use special screwdriver 501 | |||
|
|
| • Turn the screw anticlockwise to lower the speed. | |||
| 501 60 |
| 60 | |||
|
|
|
| |||
|
|
|
|
| ||
• Start the engine and run warm for 10 minutes. | Correctly adjusted carburettor | |||||
|
|
|
| A correctly adjusted carburettor means that the engine | ||
Low speed jet L |
|
| accelerates without hesitation and it “splatters” a little at full | |||
|
| throttle. | ||||
Find the highest idling speed by slowly turning the low speed | ||||||
• A too lean adjusted | ||||||
needle clockwise and anticlockwise. When the highest speed | ||||||
and poor acceleration. | ||||||
has been found, turn the | ||||||
• A too lean adjusted | ||||||
|
|
|
| |||
High speed jet H |
|
| acceleration and/or damage to the engine. | |||
|
| • A too rich setting of the “L” and “H” needles give accelera- | ||||
The | ||||||
tion problems or a too low working speed. | ||||||
speed. A too lean | ||||||
|
| |||||
far) gives too little fuel to the engine resulting in damage to | NOTE! |
| ||||
the engine. |
|
| If the cutting equipment rotates while idling the T- |
| ||
Run the engine at full throttle for about 10 seconds. The H- | screw should be turned anticlockwise until it stops. |
| ||||
needle is set correctly when the engine “splatters” a little. |
|
| ||||
|
|
If the muffler smokes heavily, at the same time as the engine “splatters” a great deal, the setting is too “rich”. Turn the H- needle clockwise until you find the setting that sounds right.
Carburettors in
On these types of carburettor the H- and
The carburettor needles on these carburettors are fitted with plastic sleeves with movement limiters,
To carry out adjustment when replacing needles or the entire carburettor the engine must be under load. This is achieved by fitting a Trimmy Fix with the specified length and diameter of trimmer cord. Consequently, the stated speed will be much lower than with “normal” carburettor adjustment when the engine may run freely.
After replacing the needles or the entire carburettor on a
The combiguard or trim guard must be fitted when adjusting the
26