Gunson's Colour Tune?

[beemer]

Anyone ever tried using one of these to set your carb mixture?

[Bob_Roller]

I've got one,problem with mine, is that the spark arcs across the glass viewng window .

The later version, had a ceramic insulator that the spark plug lead attaches to .

The one I have, just has a tightly wound spring with a thin insulator on it, it threads onto a short threaded stud that comes out of the clear glass viewing window .

The 'spring' lead then snaps it into the spark plug cap, I haven't been able to get to work correctly .

Need to find some sort of sealant to seal the area where the 'spring' lead meets the glass .

I remember one member here, I think it was semper gumby, has one, hopefully he can add some of his experience .

[Barry]

I haven't used a colour tune for a very long time. My recollection is that it wasn't a magic solution to setting the mixture accurately. Aiming for a completely blue flame I always seemed to end up with the mixture too weak and lost power as a result. Probably would be very useful to indicate mixture differences side to side when balancing the carbs. I would like to try one again for that.  

[beemer]

Iv'e had one around for years,used to use it on one of my cars,it will work with bike but i found the exact same thing you said Barry,i got it nice and blue but it was too weak and the bike was like a hedgehog trying to cross the road,very slow! so reverted back to the method many do on here,but iv'e replaced my diaphrams and i'm going to give it another go.

[Motu]

I have two - one for this side...



And one for this side...