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10. Carburetor Mixture Screws

 The 1130 saws do not have

mixture screws or limiter caps

 Notice that the H and L holes are

not threaded and are blocked off

internally

 The only adjustment on a 1130

saw is to set the idle speed with

this screw

 It also makes slight mixture

adjustments as the idle speed is

tuned

 This carburetor uses a fixed

orifice jet to regulate the amount

of fuel available to the engine

and is not adjustable

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10. Carburetor Screw Settings

 Limiter caps can be removed by

the service technician for carb

service

 Removal of this style of limiter

cap is done with the 5910 890

4501 tool

 Anytime a cap is removed best

practice is to replace it with a

new one

 On the 1130 saws this step

does not apply

 4229 121 2701

Stihl MS 18 User Manual

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