help with colortune

[Guest]

OK ,tried to use the color tune on my 79 gs1000e , pods, 4 in 1 open header ,15 pilot jet , 125 main jets , got 3 carbs to turn yellow then blue , but one never would turn yellow ? many thoughts , iam going to do all again, but like to hear from you guys on this,

Thanks

[azr]

There's at least a dozen reasons why this is happening. First off you are trying to tune a bike which you have taken far from stock.....good luck. Secondly, which carb is that happening to?

[tbirdhd]

vm 26's ..................................

[btbarb]

no

vm 26's ..................................

No, he means which carb has the problem- #1, #2, #3 or #4.

If you're getting fire but not your desired color on the cylinder, it's an air or fuel problem. Too much air or not enough, or too much fuel or not enough. Causes could be orings, debri, float level, buggered parts, etc..

[tbirdhd]

oh ok sorry , it is the # 2 carb ,

[Steve]

oh ok sorry , it is the # 2 carb ,

The second one from the left?

The carbs are numbered from left to right (as is everything else), #1 is under your clutch hand, #4 is under your throttle hand.

I would be more accepting of #3 having the problem, especially if you forgot to plug the vacuum line to the petcock.

.

[tbirdhd]

HI steve , yes it is #2 from left, and the vacuum is blocked off , pingel fuel valve , love it !! , yeah i can understand what you are saying about #3, ,, iam going to try again ,

[azr]

Do you think a fuel tip may be broken off inside the carb body?

[hampshirehog]

Or the pilot is blocked or your carbs are out of synch.

[tbirdhd]

hi azr , hamp , will check both and will do synch in few days ,should be in mail tomorrow , thanks for help

[chuck hahn]

Where are the pilot screws set at? About 7/8 is about just perfect..anymore is just wasted fuel in the pilot circuit and makes tuning that much harder up top.

Also, I would take the mixture ( side screw) out of that carb and give it a good shot of cleaner and air to see if its a little blocked. Remember this little catch word..INrichen. turning the mixture screws in cuts down on the air being mixed and thus RICHENS the mixture.

[chuck hahn]

Also note that the instruction say ( I think they do anyway ) to set the idle up at around 2,000 RPMs. And note that even when you have all 4 looking good, as you blip the throttle youll see a burst of yellowish orange. This is normal as to the operation of the carbs themselves so dont freak.

Once I am happy at the 2,000ish zone I run the RPMs up to around 4,000 and hold a few seconds so the cylinder has a chance to rebalance and then see how the colors look.

[tbirdhd]

thanks Chuck , ill start over with them , I do think the pilot screws are a bit more than that , ill have to check ,

[chuck hahn]

The pilot screws are only into play till around 1/4 throttle but do "help" supply fuel during the shift to the mains. Thats why around 7/8 is all youll ever need regardless if its a stock air box or pods.

The main and pilot jets are whats to be figured out with the pods. Its gonna take some mix and match experimenting but youll find what the engine likes the best.

[tbirdhd]

ok making more sense now, so if it out more than 7/8s , need bigger pilot jet, has 15s in it now, need to do some digging in to them .