Gunson colortunes are glass topped
spark plugs that let you see into the cylinder and the combustion flame
colour.By varying the mixture strength (which changes the flames colour) the
carb can then be set or adjusted to optimise fuel economy and power .The
colortune kits are supplied with full,easy to follow instructions.Ideal for
older cars especially those with variable jet carburettors like SU or Stromberg
or where the needle can be adjusted (older Amal carbs) to adjust the mixture
strength through the whole rev range.The colortune can also be used to diagnose
rich or weak mixture in fuel injected vehicles and help in jet selection on
other carburettors.The standard colortune fits a 14mm spark plug hole,12mm
and 10mm colortunes are also available along with adaptors in those sizes to
allow a standard 14mm colortune to be used in smaller spark plug holes.The
larger 18mm adaptor fits many classic cars and older fords etc.
Ignition
timing lights work on the strobe principle they flash a spot of light at the instant the spark plug fires,which
makes the engines timing marks on the crankshaft pulley or flywheel
appear stationary with the engine running,timing lights are used to set
the ignition timing (usually with the engine idling and the vacuum advance
disconnected) and check for correct timing advance at higher rpm. They provide a more accurate setting than the static method of
using a light bulb connected across the points to determine the position the
ignition points open,which can't obviously be used on electronic contactless
systems.
| Gunson ignition timing light.Has advance feature,setting a dial to advance required enables the TDC marks to be used to check spark advance at higher revs etc.Inductive pick up,12 volt systems,Xenon bulb gives bright light.A decent bit of kit.£34..00 post £4..00p. |  |
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| Draper ignition timing light.Easy to use,clip on inductive pick up to trigger light fires gun by HT voltage (no need to disconnect spark plug leads) and bright xenon bulb.Unit has on off trigger and is powered from the vehicles own 12 volt battery,this gives a brighter flash than the old fashioned timing lights which only worked in conditions of low light.£17..00p plus post £4..00p |  |
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| Gunson timing light Inductive pick up from the spark plug HT lead and uses vehicles own 12 volt supply.Can be used to set ignition timing (see manual) and to check the mechanical ignition advance and retard mechanisms..£16.75 plus £4..00p post to UK |  |
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| Gunson 14mm colortune kit.Ideal for older cars and bikes with variable
main jets (SU Stromberg etc) or where the needle can be raised or lowered
(Amal carburettor etc) but can check the mixture on all engines .Gunsons c
olourtune is ideal for classic cars,you adjust mixture
strength by setting the combustion flame colour (same principle as a
bunsen burner) by looking through the glass top of the colortune into the
combustion chamberA complete kit with extension
tube,instruction sheets,lead,mirror,cleaning brush and cowl,14mm spark plug thread £24.00 plus
postage.UK £2.50p,Europe £3.00 Rest of world £4.00p Select correct postage
from list.Simple to use,simply replaces a spark plug,can also be
used to balance the fuel/air mixture strength on twin carb set
ups. Larger picture click here |
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| Colortune 18mm adaptor.Enables the standard 14mm colortune to be used in some early Ford cars or American vehicles that have a 18mm threaded spark plug.Allen key (supplied) is used to tighten the adaptor and the colortune screws into it.£5..50 plus £2..00p post.(UK).Rest of world post £4..00p.Select correct destination from list. |  |
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| Gunson 14mm colortune kit with 10 and 12mm adaptors adaptors..This enables the colortune to be used in virtually all cars,motorbikes,mopeds,scooters,lawn mowers,generators,snowmobiles,garden machinery,chainsaws etc.£30..00. Post UK £3.50p Europe £4..00p Rest of world £5..00p. |
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| Available seperately are 10 or 12mm adaptors for the 14mm gunson colortune.This enables the colortune plug to be used in engines that use a smaller spark plug hole (motorbikes,quad bikes,mopeds,generators and chain saws etc).Screws into cylinder head with a spanner,the colortune is then screwed into the adaptor.Price £5..00p post £2..00p (UK). |  |
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| Also available the Colortune kits with 10 or 12mm spark plug
threads for vehicles using smaller
plugs. Fits,motorcycles,mopeds,generators,garden machinery
etc. This avoids the use of an adaptor but as adaptors only fit the 14mm colortune the smaller sizes can be used in one spark plug size only Price of 10 or 12mm colortune £28..00 plus £4..00p post I sometimes have second user Colortunes and Timing lights for sale.Please mail or ring. |
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I list tools and
servicing equipment etc for sale on Ebid
auctions and in the USA and Canada with Ecrater. Please have a
look at these and other auctions of tools.More ordering details FAQ etc click
here.
Baconsdozen imperial and metric
tools.
13 Waveney Road
Lowestoft
Suffolk
NR321BT
Colortunes and how to use
them.
Instructions are enclosed with colortunes,but basically
with the engine at running temperature a spark plug is removed and the
colortune inserted.With the engine running the colour of the combustion flame
can be seen through the glass top of the colortune.A white or pale blue flash
indicates a weak mixture and an orange or yellow colour indicates excess
fuel.The mixture screw should be adjusted to obtain a bunsen blue colour.The
mixture can be checked at higher rpm and pressing the throttle pedal quickly
should show a momentary enrichment quickly settling back to blue.If the mixture
is too weak and can't be adjusted,suspect a vacuum leak or blocked jet(s) a
vacuum gauge can help trace any leak.Trickling Redex or a thin oil around
suspect gaskets can reveal a leak as the oil is drawn in and blue smoke comes
out of the exhaust.A rich mixture especially at higher revs might be a partially
blocked or oily air cleaner,too high float level or a leaking float
valve.
Before setting the mixture on the carburettor the ignition timing
should be checked and adjusted if necessary with a strobe light.
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