Baconsdozen Imperial and metric tools.

Gunson colortune for checking and adjusting carburettors

Gunson colortunes are glass topped spark plugs used for setting and tuning carburettors.The user can see right into the engine cylinder and observe 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 .Gunson colourtune kits come with full instructions an extension for the HT lead and viewing tube with mirror.Ideal for classic cars with variable jet carburettors like SU or Stromberg or where the needle can be adjusted (older Amal carbs) to adjust the mixture 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 or 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.

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		£26.50 - 14mm standard colortune inc post UK £30.50 - 14mm standard colortune inc post Europe £31.50 - 14mm standard colortune inc post Rest of World
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.		£7.50 - 14mm to 18mm adaptor inc post UK £9.50 - 14mm to 18mm adaptor inc post outside UK
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.		£33.50 - Gunson colortune plus 10 and 12mm adaptors £37.00 - Gunson colortune plus 10 and 12mm adaptors £39.00 - Gunson colortune 14mm plus 10 and 12mm adaptors
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).
12 adaptor for colortune.Enables a standard 14mm colortune spark plug to fit 12mm spark plug hole.£5..00 plus £2..00p post  (UK)

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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.