Author Topic: Tuning takes time (Read 3122 times)

duane · « **on:** August 02, 2007, 01:33:30 PM »

I purchased a Colortune for the bikes. (FYI: Colortune is a tool to help adjust a carburetor's air/fuel mixture) I seemed to have opened a can of worms. Ignorance can be bliss.

Number three cylinder does not respond to changes from the air/fuel idle screw. It always burns lean. Lean = too much air: Too much air = leak, possibly vacuum. I inspected the carb boots, it's pretty obvious, that's not it.

Next thing I need to do: Disassemble the carbs and inspect. Which leads to my question. Was there someone on the internet selling complete carburetor O-ring kits for the B4? Does someone maybe have a link?

Thoughts on the Colortune: It doesn't seem to be very exact. Usually, air/fuel idle screws are adjusted in small 1/4 turns. With this Colortune, you can crank the screws 1/2 to 3/4 turns and still not see a difference. Also, my optimum tuning on these screws seems to only be 1 to 1.5 turns out. Really? And then my plugs look real sooty (dry black).

In the archives someone posted a link to a video of what the Colortune looks like in action. Here is a much better video that shows it clearly.

Banditmax · « **Reply #1 on:** August 02, 2007, 06:24:46 PM »

My bike runs on 1 and a half turns out still smells gassy on idle though and exhuast end carbons up fairly quickly too. Ive replaced all the o rings fitted new float needles set the float heights im lost here.

GooseMan · « **Reply #2 on:** August 02, 2007, 07:36:38 PM »

ask gsxr400racer for the carb rebuild kit ;)

gsxr400 racer · « **Reply #3 on:** August 03, 2007, 08:28:38 AM »

check your emulsion tubes and needles for wear on the rich running part

duane · « **Reply #4 on:** August 03, 2007, 03:29:18 PM »

Does anyone know where to find those complete gasket kits for the Bandit carbs? Thanks.
Duane

Banditmax · « **Reply #5 on:** August 03, 2007, 03:51:23 PM »

Yes jay stocks them