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Ski Doo SUMMIT 2005
Инструкция по эксплуатации Страница: 1295

Ski-Doo Ski Doo SUMMIT 2005 [1295/1429] Disassembly

Section 08 ELECTRICAL

Subsection 02 (SPARK PLUGS)

DISASSEMBLY

First unscrew the spark plug 1 turn.

Clean the spark plug and cylinder head with pres-

surized air, then completely unscrew.



WARNING

Whenever using compressed air, always

wear protective eye wear.

HEAT RANGE

The proper operating temperature or heat range

of the spark plugs is determined by the spark plug

ability to dissipate the heat generated by combus-

tion.

The longer the heat path between the electrode

tip to the plug shell, the hotter the spark plug op-

erating temperature will be — and inversely, the

shorter the heat path, the colder the operating

temperature will be.

A cold type plug has a relatively short insulator

nose and transfers heat very rapidly into the cylin-

der head.

Such a plug is used in heavy duty or continuous

high speed operation to avoid overheating.

The hot type plug has a longer insulator nose and

transfers heat more slowly away from its firing

end. It runs hotter and burns off combustion de-

posits which might tend to foul the plug during

prolonged idle or low speed operation.

A00E09A

1. Cold

2. Hot

CAUTION: Severe engine damage might occur

if a wrong heat range plug is used.

A too hot plug will result in overheating and pre-

ignition, etc.

A too cold plug will result in fouling (shorting the

spark plug) or may create carbon build up which

can heat up red-hot and cause pre-ignition or det-

onation.

FOULING

Fouling of the spark plug is indicated by irregular

running of the engine, decreased engine speed

due to misfiring, reduced performance, and in-

creased fuel consumption. This is due to a loss

of compression. Other possible causes are: pro-

longed idling, or running on a too rich mixture due

to a faulty carburetor adjustment or incorrect fu-

el and/or fuel mixing. The plug face of a fouled

spark plug has either a dry coating of soot or an

oily, glossy coating given by an excess either of

oil or of oil with soot. Such coatings form a con-

ductive connection between the center electrode

and ground.

SPARK PLUG ANALYSIS

A00E0AA

123

1. Overheated (light grey)

2. Normal (brownish)

3. Fouled (black)

Theplugelectrodeandpistondomerevealthe

condition of the engine, operating condition,

method of driving and fuel mixture. For this rea-

son it is advisable to inspect the spark plug at

regular intervals, examining the plug electrode

and the piston dome.

mmr2005-043 435

Ski-Doo Ski Doo SUMMIT 2005 [1295/1429] Disassembly

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