colortune

[Guest]

Has any one had any experience with Colortune ?

[koolaid_kid]

Yes. They seem to work O.K. with VM carbs, not so much with CV carbs. A carbtune, OTOH, is great.

[The Artful Bodger]

Recently tuned my GS 850 (VM carbs) with one and found it invaluable, I had to set the fuel needles and air screws after a total strip and clean.I pre-set the air screws to 2 turns (a guess) and did all the adjustment on the fuel needles, would have been real fun and games without the colortune. Balanced them with a home made manometer and the bike's running like a dream. Now a real fan of colortune!
Colin

[koolaid_kid]

Yes, if you have VM carbs, which were on virtually all GS models up to 1979. In 1980 they went to CV carbs, which do not respond very well to the colortune.

[bwringer]

The Colortune is a fantastic tool for getting the idle screws on VM carbs into the ballpark very quickly. And the flames are sooooo purrrty...

Final fine-tuning is based more on the bike's behavior -- throttle response, idle drop, etc.