carb tuneup

hi i want to sync the carbs and colortune i have the guage to sync and the colortune plug tool whithc one to i do first and do i plug the yics port to sync the carbs and colortune or just to sync,whan color tuning i back the mixture skerws out till the color orange than go back in whan it turns blue thats good right?i read on how to do this last year and now i need to refrash my head if someone can help please do so thank you.Ivan.

 

I suggest colortuning first. Use the YICS blanking tool for both tuning and syncing. The colortune is easier to read if you tune in a garage or at night. Bright sunlight makes it hard to see the flame. Turn the screw counterclockwise 1/4 turn at a time and wait a few seconds for the flame to change. Keep backing it out until you see an orange flame and then turn it back in 1/4 turn. Rev the throttle, just a blip, and check the flame color again. If it stays a nice blue then move to the next cylinder. Since this can overheat the engine set up a fan to keep the engine cool. Once all are done I sync. First the third screw to set carb #4 to #3. Then the first screw to set #1 to #2. And finally the second screw to set #1&2 to #3&4. Once set remove the YICS tool and put the bike back together and have fun riding!

 

thank you bluemaxim one more quastions when you colortune and sync to you set your choke higher so your rmps are higher or do u do it all at idleing speed thank you,ivan.

 

I Colortune starting deliberately LEAN.

Then, I bring-out the Pilot Mixture Screw and keep an eye on the Plug.
You'll see it starting to fire and then get start firing with regularity.

When it starts firing with regularity ... I ease the throttle open slightly.
(This can be done with the Idle Adjustment Rod)
I get the revs up above 1,800 and tune THROUGH the Blue.

The Lean side of the Blue isn't enough Mixture to answer for Off-Idle.
Tweak.
Tweak!
Not fractions ... but, Degrees.

Tweak it through the Blue until it show that its Rich.
Then.
Micro-tweak. Nudges. A degree at a time ... BACK.

When you are tweaking it BACK and get the Blue ... you're IN!

Reset the Idle Adjustment Rod and listen it Idle at 1,000 to 1,050.
If the Idle is OK and the Plug still shows Blue ...

Do the nest one!

 

Adjustments are made at factory idle- - 1050 RPM, or you can sneak it up a bit using the knob under the carbs to 1,500 RPM. Or somewhere inbetween.

 

If you Colortune for Idle or High Idle ... the Mixture will not be Rich enough to sustain itself coming Off-Idle.

It will be tuned FOR Idle. A perfect well-running bike that will Idle all day and night until the cows come home and die.

The Bike NEEDS to be Tuned for Off-Idle. You ride the Bike and open the Throttles.
You don't want a hole in the Mixture coming Off-Idle that will make the Bike hesitate until the Main Jet Supply kicks-in.

So, I recommend tuning the Bike for that.
Tuning so there is a seamless acceleration.
Tuning so you can get out-of-the-hole.

This you have to do with the Bike running ... just Off-Idle.
Sure, it make the Mixture a little more Rich than tuning for Factory Idle or a scootch more.

Do it coming back to the Blue off-idle and you won't have to re-do it wondering why it hesitates when the Plug was Blue on Idle!

 

thank you great help thank you.