Sorry,all colortunes and adaptors now sold,we have left this page as it contains instructions for use of the colourtunes at the foot of the page.
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) and can check
the fuel/air ratio on all petrol engines Simple to use,the colortune simply replaces one of
the spark plugs to test and check and the removed plug replaces it
.Larger picture click here
Adaptors available seperately contact us for post prices etc...
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
|10 adaptor for the 14mm gunson colortune.Allows 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||
12mm adaptor for colortune.Similar to the above adaptor Enables a standard 14mm colortune spark plug to fit 12mm spark plug hole.£5..00
Click here for larger image.
The Colortune adaptors listed above (10mm,12mm and 18mm ) can also be used to fit 14mm screw in type compression testers etc to different sized spark plug holes..
Links to other pages below and our site map is here
Colortunes,Instructions for use.
Instructions are enclosed with colortune kits we supply. They used to be in colour but are now in black and white .
With the engine at running
temperature a spark plug is 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 blipping the throttle pedal quickly should show a
momentary enrichment for acceleration before settling back to blue.If the
mixture is too weak and can't be corrected with adjustment 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 oil soaked air cleaner,too high float level
or a leaking float valve.
Before adjusting the mixture 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.
We do not consider a Colortune will give a correct reading on methanol or other fuels. Heavy oil burning,excessive two stroke oils or the use of too much of some additives may effect the combustion flame colour.The glass top of a colortune is quite robust but can be cracked or damaged by dropping the unit or running at maximum revs.The glass will get hot so take care in handling and removing.As with any tuning aid if there are defects with the engine (timing incorrect,valves badly adjusted or air filter choked etc) the colortune will not work correctly.
for older cars.
E-mail sales 'at' baconsdozen.co.uk
Tel (44) 01472353993