Triumph TR2 - Page 38

RUNNING AD JUSTMENTS-Engine
Sparking
Plugs
The sparking plugs were adopted for original equipment after lengthy
tests and as sparking plug types vary in suitability for different engines,
it is important that the correct type of plug be fitted when making
replacements, this is
:
Champion No. LlOS-$" reach.
In countries where the octane rating of the fuel is low, making it
necessary to use the lower compression ratio, it
may be desirable to use
Champion
L10 plugs.
For high speed touring however, use Champion No.
L11S-y reach.
The gaps
(i.e., the width between the firing point of the centre electrode
and earth point) are originally set and should
he maintained at 0.025"
(0.62
mm.). Incorrect gap settings may cause misfiring or erratic slow
running. Faulty plug leads or cracked porcelain insulation in the sparking
plug
will also cause faulty
ignition, see also page
9.
Sparking plugs should be thoroughly cleaned, checked and adjusted (if
necessary) for gap setting after 6,000 miles (10,000 km.) use and at
12,000 miles (20,000 km.) should be replaced by new plugs.
Carburettors (Twin S.U.)
TR2
: Type H4, Standard Needle F.V.
For high speed and competition work use G.C. needles.
When
carburettors are fitted with oil bath air cleaners use
AH
needles.
TR3
: Type H6, correct needle for normal and competition work S.M.
When carburettors are fitted with oil bath air cleaners use CIW
needles.
Fig. 17. Carburettors.