Motorcycle Colortune vs Automotive Colortune

[65oldsboy]

Anybody know the difference between the MC colortune and the automotive version? I know someone who has the automotive one (14mm) and is looking to sell it. There is a different part# (G4074) for the automotive one. Part# G4170 for the MC model. The Gunson web site has pretty much the same description for both of them. Any ideas?

[hamjam]

I found this , but mine is at least 10 yrs old and it seems to me it was made for a bike but I havent looked at it since I went to EFI ymmv
even with the colourtune I still did some adjusting by looking at the plugs
Jim

Gunson Colortune Tuning Spark Plug ....brand new, no display box, includes all accessories and instructions. If you really want to tune your multi-carbs to perfection, you'll have to use this unique "see-through" spark plug that allows you to view the combustion chamber flame color in real-time, thus allowing accurate (rather than guesswork) adjustments to your idle mixture screws. Use it once and you won't believe how you ever got by without it, and will pity those who don't have one of their own. Beware: you'll find that a lot of people now want to be your "friend" and have you come and tune on their bikes, once they find out you have a Colortune!

Also, please note! you can find quite a few of these plugs at a discount at various places, but most of these places are selling an older, now-discontinued "automotive" version of the Gunson colortune plug. While there are no fitment differences between the automotive and "motorcycle" versions of these plugs, just be aware that the automotive versions were designed to be used in a water-cooled engine, and thus have a significantly lower heat tolerance----and if these plugs overheat, the "clear" window either goes cloudy or just simply fractures.

[65oldsboy]

I thought there had to be some kind of difference and temperature range makes sense. That looks like an ebay listing. Where did you find that?

[CatatonicBug]

I just bought a NOS 14mm colortune on ebay last week (waiting patiently for it to arrive in the mail), and it was listed as for a Hardley. I've never seen one listed as an "automotive" type, only that they all work (with the right adapter) on both bikes AND cages (and lawnmowers, etc.).

[hamjam]

Hi I got that from an XJ forum page somewhere I thought that it was a universal part just needing to use different sized thread adapters

[65oldsboy]

Thanks for the reply. I think I will pass on the automotive unit. I will have to pay more but at least it should hold up.

I'm going to try to get the old girl up and running this weekend. The wife and kids are going to the beach this weekend. (I have to work.) I will be able to spend some quality time with the mistress (XS1100SF).

[hamjam]

lots of info here
http://tinyurl.com/2dw6qja
and here
http://www.xs11.com/xs11-info/tech-t...ce/carburators
enjoy
Jim