| 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
colourtune 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, for14mm spark plug thread
£24.00 plus postage.UK £2.50p,Europe £6.50 Rest of world £7.50p Select
correct postage from drop down list list.Simple to use,the colortune
temporarily replaces one of the spark plugs. 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 drop down list. | ![]() |
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| Standard Gunson 14mm colortune kit with the addition of 10 and 12mm 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 £7..00p Rest of world £9..00p. |
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| 10 adaptor 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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| 12 adaptor for colortune.Enables a standard 14mm colortune spark plug to fit 12mm spark plug hole.£5..00 plus £2..00p post (UK) |
Links to other pages.
Since 2002 I've listed
tools,vehicle tuning 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
E-mail sales @at@ baconsdozen.co.uk
Gunson Colortunes,Instructions for
use.
Instructions are enclosed with colortunes. Simply with
the engine at running temperature a spark plug is removed and replaced
with the colortune.With the engine ticking over the colour of the
combustion flame can be observed 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,valve clearances
and spark plugs should be checked and the air filter cleaned or replaced if
necessary.