Sorry running out of time

[Nubian]

I checked previous posts to no avail.
Rebuilt my carbs and can't get mixture right AGAIN. synched and running around 1K, but after warm up revs up to 2.5-3K rpm's
Too lean/rich?

[motoman]

Syncing is an act of futility without mixtures set correctly. Setting each mixture correctly will likely require the idle to be dropped each time to 800+-. Same should happen again while syncing them. After set, idle needs to reset at the 1100rpm. Mixtures and sync SHOULD be done at lowest rpm that it still runs easily with no loping. If all done correctly, should idle smoothly
down to 450rpm before any lope sets in. This low a rpm to be used as a somewhat of a guide as to how painstaking you have have been setting carbs. Oil pressure is low at this rpm, so IMO would avoid any EXTENDED idling below 800rpm(ideal mixture setting/sync rpm).

[natemoen]

Your sync needs to be done when warm. If it is idling that high when warm then you need to drop the idle down and resync and readjust the idle mix.

[jetmechmarty]

Put the sync tools away. You should be able to get it running very well without it. You should be able to get it running so well you think sync doesn't need to be done. That's when it's time to do the sync.

I'm try to say you must be getting ahead of yourself somewhere.

[Nubian]

I hear you Marty, forgot I had a colortune , did not help color seems to be right, plugs are white.
I'm at 2 1/2 turns out, if I bring it out to 3 will that make it leaner or richer?

[bikerphil]

More turns out is richer. With colortune, look for yellow/orange color. Blue will be too lean.

[MarkD]

Out = richer/ in = leaner

[jetmechmarty]

Make sure you aren't sucking air where you aren't supposed to. Throttle shaft seals and manifold boots are suspect when they're this old. I had to replace both on mine to get it right. Make sure the float levels are correct too.

Once you get it right, all you have to do is ride it. My XS650 has pretty much the same carburetors, and it starts on the first kick even after sitting for weeks or even months. (I don't store it with E10 in it)

[Nubian]

More turns out is richer. With colortune, look for yellow/orange color. Blue will be too lean.

Well then I am too lean.

[Nubian]

Make sure you aren't sucking air where you aren't supposed to. Throttle shaft seals and manifold boots are suspect when they're this old. I had to replace both on mine to get it right. Make sure the float levels are correct too.

Once you get it right, all you have to do is ride it. My XS650 has pretty much the same carburetors, and it starts on the first kick even after sitting for weeks or even months. (I don't store it with E10 in it)

.

Will check throttle shaft seal. Boots are ok. Float levels are set @23mm. Last time I did this 2 yrs ago. I got it running sweeeeet at 2 1/2 turns, but I had not set the float levels to spec. Goes to figure that now 2 1/2 turns won't cut at this new float level.

[DiverRay]

Try setting the floats 1mm higher. The "new" fuels are lighter than the good old stuff, and you need to keep the fuel a little higher in the bowls to work well. Remember, in 1978 we didn't put anything but gasoline in the fuel tank....

[Nubian]

Well, turns out that 3 1/2 turn outs did the trick. Running smooth, will try to fine tune 1/4 turns in or out from there. Colortune is practically ruined, I guess engine got too hot while it was running too lean as my mechanic buddy insisted we start at 1 turn out. Lesson learned
Tried to synch from there and all her broke loose, would not run right the minute my gauge was set up. I read somewhere to set vacuum at highest level using a mightyvac. Can someone explain that method, while I try to figure out what's wrong with my gauge setup.

[bikerphil]

When syncing the carbs, you want all 4 gauges to be equal. Don't worry about the actual number readings, just all the same. After they are all equal, you can then tweak the mixture screws one at a time to get the highest reading on the gauges, then re-sync back to all equal and you are done.

[Nubian]

When syncing the carbs, you want all 4 gauges to be equal. Don't worry about the actual number readings, just all the same. After they are all equal, you can then tweak the mixture screws one at a time to get the highest reading on the gauges, then re-sync back to all equal and you are done.

I use a 1 gauge setup with a 4 way valve, my preferred method (calibration not needed) I hear you on the readings. My problem was I could not even keep it running with my setup which was strange because I have used it before with no problem so maybe valve/gauge going bad?
I want to try the other method mentioned before using a mightyvac to set vacuum level at highest point.

[Nubian]

When syncing the carbs, you want all 4 gauges to be equal. Don't worry about the actual number readings, just all the same. After they are all equal, you can then tweak the mixture screws one at a time to get the highest reading on the gauges, then re-sync back to all equal and you are done.

Got them all equal! How to tweak? When will I know it's too high? When it starts popping?
I guess I would start with static #3 get that as high as possible then match the rest as close as possible?