Manual Stihl HT 133 (page 20 of 96) (English, Spanish)

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HT 102, HT 103, HT 132, HT 133

English

This engine is certified to operate on

unleaded gasoline and the STIHL two-

stroke engine oil at a mix ratio of 50:1.

Your engine requires a mixture of high-

quality gasoline and two-stroke air

cooled engine oil.

Use mid-grade unleaded gasoline with a

minimum octane rating of 89 ((R+M)/2)

and no more than 10% ethanol content.

Fuel with an octane rating below 89 may

increase engine temperatures. This, in

turn, increases the risk of piston seizure

and damage to the engine.

The chemical composition of the fuel is

also important. Some fuel additives not

only detrimentally affect elastomers

(carburetor diaphragms, oil seals, fuel

lines, etc.), but magnesium castings and

catalytic converters as well. This could

cause running problems or damage the

engine. For this reason STIHL

recommends that you use only quality

unleaded gasoline!

Gasoline with an ethanol content of

more than 10% can cause running

problems and major damage in engines

and should not be used.

For further details, see

www.STIHLusa.com/ethanol

The ethanol content in gasoline affects

engine speed – it may be necessary to

readjust the carburetor if you use fuels

with various ethanol contents.

WARNING

To reduce the risk of personal injury

from loss of control and / or contact with

the running cutting tool, do not use your

unit with incorrect idle adjustment. At

correct idle speed, the cutting tool

should not move.

If your power tool´s idle speed is

incorrectly adjusted, have your

authorized STIHL servicing dealer

check your machine and make the

proper adjustments and repairs.

The idle speed and maximum speed of

the engine change if you switch from a

fuel with a certain ethanol content to

another fuel with a much higher or lower

ethanol content.

This problem can be avoided by always

using fuel with the same ethanol

content.

To ensure the maximum performance of

your STIHL engine, use a high quality 2-

cycle engine oil, such as STIHL 2-cycle

engine oils. STIHL 2-cycle engine oils

are specially designed for STIHL

engines. To help your engine run

cleaner and reduce harmful carbon

deposits, STIHL recommends using

STIHL HP Ultra 2-cycle engine oil, or

use an equivalent high quality 2-cycle

engine oil.

To meet the requirements of EPA and

CARB we recommend to use STIHL HP

Ultra oil or equivalent.

Do not use BIA or TCW rated (two-

stroke water cooled) mix oils or other

mix oils that state they are for use in both

water cooled and air cooled engines

(e.g., outboard motors, snowmobiles,

chain saws, mopeds, etc.).

Take care when handling gasoline.

Avoid direct contact with the skin and

avoid inhaling fuel vapor. When filling at

the pump, first remove the container

from your vehicle and place the

container on the ground before filling. To

reduce the risk of sparks from static

discharge and resulting fire and/or

explosion, do not fill fuel containers that

are sitting in or on a vehicle or trailer.

The container should be kept tightly

closed in order to limit the amount of

moisture that gets into the mixture.

The machine’s fuel tank should be

cleaned as necessary.

STIHL MotoMix

STIHL recommends the use of STIHL

MotoMix. STIHL MotoMix has a high

octane rating and ensures that you

always use the right gasoline/oil mix

ratio.

STIHL MotoMix uses STIHL HP Ultra

two-stroke engine oil suited for high

performance engines.

For further details, see

www.STIHLusa.com/ethanol

Fuel mix ages

If not using STIHL MotoMix, only mix

sufficient fuel for a few days of work, not

to exceed 30 days of storage. Store in

approved fuel-containers only. When

mixing, pour oil into the container first,

and then add gasoline. Close the

container and shake it vigorously by

hand to ensure proper mix of oil and

gasoline.

Fuel

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Stihl HT 133 Manual

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