Gunson Colourtune spark plugs

Look around here for some great advice on getting the most out of your tools! Tips and tricks!
Post Reply
User avatar
Highest Ranking Member
Posts: 6635
Joined: Mon Jul 06, 2009 9:03 pm
My tercel:: none currently, 7 previous
Location: bc, canada

Gunson Colourtune spark plugs

Post by dlb » Sat May 09, 2020 9:08 am ...

A friend of mine who is working on his Austin Mini just told me about these spark plugs. It's obviously pretty gimmicky but it also looks really cool. My friend's description: "It's a clear-bodied spark plug that lets you see what colour the flame is in the combustion chamber so you can see if the mix is rich (orange), lean (white), or just right (light blue). I think I'm going to get one, partially just because that's cool as hell."

User avatar
Highest Ranking Member
Posts: 592
Joined: Sat Aug 30, 2014 6:52 pm
My tercel:: 1983 Tercel SR5 4WD
Location: Texas

Re: Gunson Colourtune spark plugs

Post by BaileySims » Sat May 09, 2020 9:37 am

I really like this. I think I'll be picking one up too.
Blood, sweat and beers.

User avatar
Highest Ranking Member
Posts: 11391
Joined: Sun Jan 28, 2007 6:31 pm
My tercel:: '84 Tercel4wd w/extensive mods
Location: Arlington WA USA

Re: Gunson Colourtune spark plugs

Post by Petros » Thu May 14, 2020 9:03 pm

cleaver invention, but I can see it being way more useful if the fuel mixture was easy to adjust. this would be ideal for the old SU duel carb set up, or if you have a megasquirt EFI system.

it does not appear to be durable enough for running it under load, so it means you can only use it to check the idle, or just off idle mixture. if you could, I can see this tool very useful for fine tuning the jetting on a Weber, especially if you can rig a way to inspect it while driving at speed under load.

if you buy this, check back and let us know how it works out.
'87 Tercel 4wd SR5 (current engine swap project)
'84 Tercel 4wd (daily driver, with on going mods)
'92 Mazda MPV 4wd (wife's daily driver)
'85 Tercel 4wd DLX auto(daughter's daily driver)
'01 Honda Civic (other daughter's daily driver)

Post Reply