FOR PAKISTAN INDIA CANDLE U22FS-U NGK C7HSA C7HA Z8YC IUF22 FOR
HONDA 90CC 70CC SUZUKI YAMAHA HOMELITE KAAZ
Part No.: C7HS
|Seal Type||Gasket Seat|
|Center Electrode||Copper with nickel plated|
Spark plug Introduction:
1. multi-ribbed insulator eliminates flashover
2. Spark plug insulator made of 95% pure alumina
3. strong resistance to heat and shock
4. superb insulation
5. good-looking appearance
6. spark plug nickel-plated housing prevents oxidation and
7. spark plug heat crimping process ensures absolute air-tight fit
8. copper core electrode prevents oxidation and corrosion
9. inner sealing with conductivity glass ensures a fine
conductivity and sealing
10. New ceramic insulator provides better insulation.heat
dissipation,resistance against heat shock and mechanical failure.
1, 95% Alumina Insulator
Excellent insulation can withstand 20000--30000V high- votage, to
ensure the good spark.
Excellent thermal conductivity, to prevent over-burning
Strong heat shock resistance,withstand repeated temperature change
from normal to 2500°
High mechanical strength,to withstand 50kg/cubic centimeter of the
outbreak of the pressure
2, Copper Core Electrode
High heat resistant
High corrosion resistant
3, Nickel coated matel shell
High corrosion resistant
Decompose slowly, live longer
How to Read Your Spark Plugs
Is your engine running too lean? Too rich? Is there an issue with
oil control or ignition timing? Or is everything just fine with
your engine? Like the mechanical version of the Magic 8-Ball, your
spark plugs may have the answers for you. The trick is learning how
to read your spark plugs.
With help from the spark plug experts at Beyond First Auto, we’ll
teach you how to diagnose minor tuning issues or potentially major
engine problems by examining your spark plugs. Check out the images
below, courtesy of Spark Plugs, and get ready to do a little light
reading the next time you pull your spark plugs.
Appearance: A light tan/gray or brownish color, along with very
little electrode erosion, indicates optimal operation conditions,
including a healthy engine and correct spark plug heat range.
Appearance & Symptoms: The electrodes—center and ground—are
covered in an ashy coating. As a result of this masking of the
electrodes, your engine may experience a misfire. This build-up of
combustion deposits can eventually (but not usually) fill in the
space between the two electrodes.
Possible Causes: Oil leaks, poor fuel quality.
Wet and Dry Fouling
Appearance & Symptoms: Dry fouling (top) appears as sooty,
black build-up. Wet fouling (bottom) has a wet, sometimes oily
appearance. Both conditions can create poor starting and misfiring.
Possible Causes: Depending on whether the spark plug is coated in
oil or fuel, wet fouling can be symptomatic of a compromised head
gasket, poor control from your pistons’ oil control ring,
valvetrain problems, or an extremely rich condition. Dry fouling,
or carbon fouling, is often caused by an overly rich condition, and
the problem may lie with your air cleaner (clogged) or carburetor.
Other possible causes could be low compression, vacuum leak, overly
retarded timing, or improper spark plug heat range.
Appearance & Symptoms: Lead fouling can only occur in
applications that use leaded gasoline, such as racing engines. Lead
fouling generally shows up as yellowish brown deposits on the spark
plug’s insulator nose. Lead fouling can cause your engine to
misfire only at high-rpm and under hard acceleration.
Possible Causes: This condition commonly occurs when gasoline
contains too much lead; however, because spark plugs are changed
frequently in racing applications, lead fouling has become less
Appearance & Symptoms: The insulator around the center
electrode may be broken (see left) or the ground electrode may be
bent. Again, you will likely experience misfire and some power loss
under these conditions.
Possible Causes: If the insulator is broken, it may be the result
of sudden thermal expansion or thermal shock caused by extreme
temperatures or temperature change. Detonation is often the culprit
and can be caused by an extremely lean air/fuel mixture,
drastically advanced timing, improper gasoline octane rating.
Appearance & Symptoms: In this case, the center or ground
electrode is melted or scorched, and your engine may be
experiencing some power loss.
Possible Causes: Melting often results from loose installation,
which prevents the plug from properly transferring heat from its
tip. But melting may also indicate unusual heat or hot spots within
the combustion chamber. This excessive heat is often the result of
pre-ignition, which can be created by an overly lean condition,
improperly advanced injection timing, or improper heat range (too
Appearance & Symptoms: The tip of the ground electrode looks
chipped and its surface may be thinned.
Possible Causes: Another condition unique to leaded gasoline, this
condition is caused by lead compounds that react chemically with
the electrodes at high temperatures. This makes the electrode
material (nickel alloy) weak and brittle. This is caused by too
much lead in your gasoline.
Erosion, Corrosion & Oxidation
Appearance & Symptoms: A plug with a combination of erosion,
corrosion, and oxidation will have pitted and rough electrodes and
may even have a green cast if the oxidation is heavy. These
conditions can result in increased, improper spark plug gap and
yield poorer performance.
Possible Causes: Typically, these conditions occur over time as
lead in the gasoline reacts with the electrode materials.
Appearance & Symptoms: The insulator will have a glazed white
appearance and may have small black deposits. There may also be
abnormal electrode wear, and you will likely notice a loss of power
at high speeds or under high engine load.
Possible Causes: Overheating may occur from over-advanced ignition
timing, poor cooling system efficiency, lean air/fuel mixture,
vacuum leak, or wrong spark plug heat range (too low).