Syncing carbs and gas through leaking airbox

[jkluczyk]

So, first time at this carb syncing, new territory for me!

Just want to make sure i'm not missing something.

Plugged my gauge into the all four boots. Gas tank backwards. I still had all four lines hooked up to the gas tank, and set it to prime. It immediately started leaking through the airbox. Once I set it to reserve the leaking stopped.

Now, the octopus, is usually connected to boot 2, but with the gauge i just it it open?

From what i gather, i'm just looking to get all the dials to match at around 1k rpm. Disregarding the actual readings on the gauge.

One thing I couldn't find was, where is the starting point for the idle screws, i have them in all the way.

bad video where i started...but i think i left it worse then it was.
https://www.facebook.com/photo.php?v...type=2&theater

[jetmechmarty]

OK. We're putting the cart before the horse. Forget the vacuum sync until you fix the float valves. If the petcocks weren't set to PRIME, the vacuum shutoff is failed open as well, but that can wait.

[jkluczyk]

OK. We're putting the cart before the horse. Forget the vacuum sync until you fix the float valves. If the petcocks weren't set to PRIME, the vacuum shutoff is failed open as well, but that can wait.

but there is no leaking while it's on run or reserve which seemed odd to me. I just cleaned the carbs good and added new float needles (although, i didn't really check the float levels except for eyeballing it).

[jetmechmarty]

So, if the petcock position is ON or RES, no leak, correct? It leaks when you select PRIME? If so, the vacuum shutoff is working. You have one or more failed float valves. If plumbed correctly, the vacuum shutoff is bypassed with PRIME selected.

[natemoen]

Often on the first fill up of the float bowls the floats can hang up on the sides. Give the bowls a good knock with a screwdriver handle and see if it stops.

Did you verify that that one hose (from your other thread) was in fact the vacuum advance and get it plugged into the #2 carb?

[donebysunday]

Make sure you have the bike level, if not wedge something under the center stand and using a line level on the valve cover make it level. Then check to see if it still leaks. If it does leak then float seats are not seating/out of adjustment.

[jkluczyk]

Often on the first fill up of the float bowls the floats can hang up on the sides. Give the bowls a good knock with a screwdriver handle and see if it stops.

Did you verify that that one hose (from your other thread) was in fact the vacuum advance and get it plugged into the #2 carb?

yes I did!
I didn't notice it before, but sure enough it was there, i knew what i was looking for this time. I got all the hoses wired up and the bike started first try with gas.

-no leaks on with on/reserve.

Felt good!

I try to give them some taps, hopefully that solves it, don't really want to take it apart again...or at least not till i get the bike home to my garage.

[motoman]

yes I did!
I didn't notice it before, but sure enough it was there, i knew what i was looking for this time. I got all the hoses wired up and the bike started first try with gas.

-no leaks on with on/reserve.

Felt good!

I try to give them some taps, hopefully that solves it, don't really want to take it apart again...or at least not till i get the bike home to my garage.

Your still gonna have to go back thru the carbs again, actually setting float levels since the new float needles will likely have changed the actual floats position a bit. (eyeballing them is NOT gonna cut it).
If bike still has the later model carbs with the recessed idle mix. screws, from lightly seated, out 3 1/2 turns will get it in the 'ball park' to ride it home.

[jkluczyk]

Your still gonna have to go back thru the carbs again, actually setting float levels since the new float needles will likely have changed the actual floats position a bit. (eyeballing them is NOT gonna cut it).
If bike still has the later model carbs with the recessed idle mix. screws, from lightly seated, out 3 1/2 turns will get it in the 'ball park' to ride it home.

dang...oh welp. Practice is practice I guess.

[tinman905]

I usually set the idle higher (1500)
than the normal idle setting when syncing the carbs .

[natemoen]

I usually set the idle higher (1500)
than the normal idle setting when syncing the carbs .

But the lower you can set the idle when syncing the better the sync.

[motoman]

I usually set the idle higher (1500)
than the normal idle setting when syncing the carbs .

Syncing multiple carbs, no matter the application is done at a lower than normal idle setting. In this case will be in the 800rpm range.
When everthing is set correctly(idle mixes/sync), the XS11 motor should idle smoothly down to approx. 450rpm before any engine 'loping' occurs.
Wouldn't let run at that low of rpm to long, cept for a test, as the oil pressure is too low at that rpm.

[tinman905]

Syncing multiple carbs, no matter the application is done at a lower than normal idle setting. In this case will be in the 800rpm range.
When everthing is set correctly(idle mixes/sync), the XS11 motor should idle smoothly down to approx. 450rpm before any engine 'loping' occurs.
Wouldn't let run at that low of rpm to long, cept for a test, as the oil pressure is too low at that rpm.

I leave the Carbtune gauge connected after syncing higher than normal idle speed as per instructions and then set to proper idle speed .Double check the sync again. I usually find it needs very little adjustment if at all at normal idle speed. I don't see the benefit to sync below normal idle as the bike will operate at above idle speeds.

[motoman]

I also have the CarbTune Tinman905............but also have the mercury stixs with WAY farther distance between graduations......for comparisions. You can be sure there IS a difference when done at below 1,000rpm, although you won't see it on the Morgan with closer graduations between numbers.
To wisp away any further doubt you may have, two good friends of mine(one who actually when alot younger assembled my Venturer out of the crate), the previous mentioned one is now head mechanic at dealer where I purchased my 1100, and the other is here where I live now and has his own private shop after decades at dealerships. Both were factory trained on the XS series back in the day along with an array of other scoots.
Both will tell you the same as Nate stated, lower than normal idle setting to set idle mixtures AND sync. IS the correct way......and with cooling sessions, blip and release throttle several times to seat thread screws, as I can guarentee you there will be a slight change in levels between the four when you do this. Takes several times stopping and starting again, with ever so slight movement of each screw to get levels to hold true equally untill those throttle flips leave vacuum levels all equal.
There's no such thing as a 10min. carb sync if done correctly.

[tinman905]

I also have the CarbTune Tinman905............but also have the mercury stixs with WAY farther distance between graduations......for comparisions. You can be sure there IS a difference when done at below 1,000rpm, although you won't see it on the Morgan with closer graduations between numbers.
To wisp away any further doubt you may have, two good friends of mine(one who actually when alot younger assembled my Venturer out of the crate), the previous mentioned one is now head mechanic at dealer where I purchased my 1100, and the other is here where I live now and has his own private shop after decades at dealerships. Both were factory trained on the XS series back in the day along with an array of other scoots.
Both will tell you the same as Nate stated, lower than normal idle setting to set idle mixtures AND sync. IS the correct way......and with cooling sessions, blip and release throttle several times to seat thread screws, as I can guarentee you there will be a slight change in levels between the four when you do this. Takes several times stopping and starting again, with ever so slight movement of each screw to get levels to hold true equally untill those throttle flips leave vacuum levels all equal.
There's no such thing as a 10min. carb sync if done correctly.

I'm am not saying you or Nate are wrong and have done it the same in the past. I achieve 35 to 38Mpg with my stock bike so I am happy. I wish I could get more than 32 on my current bike . I have the mega cycle cams and pushing close to 98 hp so I have to expect lower Mpg's for now but still working on it.