Gunsons Colortune - pros/cons?

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namtip
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Gunsons Colortune - pros/cons?

Post by namtip » Sat Apr 04, 2015 3:32 pm

I'm thinking about buying one of these, looks great for setting your mixture. Has anyone used one? My only second thoughts however is that this can really only be done while off the bike - not riding it. Would different loading/acceleration conditions generally change the mixture? If I set the mixture right at idle, would it then be right at cruising speed? :?
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ZIP TIE
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Re: Gunsons Colortune - pros/cons?

Post by ZIP TIE » Sat Apr 04, 2015 3:55 pm

How much are they now?
You'd be better off getting a fuel/air meter and a lambda sensor.
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namtip
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Re: Gunsons Colortune - pros/cons?

Post by namtip » Sat Apr 04, 2015 4:07 pm

They're averaging £25 these days. Seems a lot for what is essentially a glass spark plug!
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Britcyclerider

Re: Gunsons Colortune - pros/cons?

Post by Britcyclerider » Sat Apr 04, 2015 4:28 pm

Useful, but only for setting the mixture at idle, and maybe a bit above.

The main jet delivers the fuel for the later stages of throttle opening and hence the mixture can then only be adjusted by changing the main jet.

I've never used mine on an MT, only Minis and Moggys- is an adaptor available for the smaller plug size?
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Re: Gunsons Colortune - pros/cons?

Post by ZIP TIE » Sat Apr 04, 2015 4:28 pm

Like you say next to useless for seeing what's going on under load which is really where you need to and if you can't set a single cylinder single carb’d bike at idle then it's time to do some reading.
Their only real benefit is setting a base line on a multi cylinder with more than one fuel delivery/metering point.
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namtip
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Re: Gunsons Colortune - pros/cons?

Post by namtip » Sat Apr 04, 2015 4:40 pm

Thought that might be the case. Think I'll save my £25. Thanks for the replies.
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vic

Re: Gunsons Colortune - pros/cons?

Post by vic » Sat Apr 04, 2015 5:42 pm

Hi all

I used one on my 350, you set the revs over two thousand so it is not idle speed you are setting. Also there is a colour chart the will tell you other faults when revving from low to high.

Are they worth £32 off eBay yes well worth it if you want it near right and you cannot do it by ear.

Hope this helps

Vic
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