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Idle screw nightmare

  • Thread starter Thread starter SeanMora77
  • Start date Start date
S

SeanMora77

Guest
So I recently cleaned my Carbs and re-adjusted the floats"which were way off", and reassembled everything. Bike started and ran... Ok, but didn't want to idle at all. I checked the #1 carb idle screw and it was seated and as the Carbs were mounted I then checked the #4 carb and the idle screw was stripped. I tried to drill it out and sink a drywall screw in it to get it out but no such luck. Does anyone know a good technique for removing this? I am hoping it isn't ruined.
 
Hi,

Have you tried a left-handed drill bit?



Thank you for your indulgence,

BassCliff
 
Hi,

tkent02 said:
Exactly which screw are you talking about?
Click to expand...

I was assuming the "idle mixture" screw. But you know what kind of trouble I get into when I "assume". :p


Thank you for your indulgence,

BassCliff
 
Sounds like you are talking about your sync screws(?) which there are 3 (1screw for #1 carb, 1screw for #2 and #3 and one for the #4 carb), so if you messed with those, your snyc is all screw up. And if you are talking about the screws on top front part of the carb those are you idle mixture settings. There is only one idle screw for all the carbs and its the big sucker underneath with a knurled knob in the middle.
 
Last edited:
Hi,

mrbill5491 said:
Sounds like you are talking about your sync screws(?) which there are 3 (1screw for #1 carb, 1screw for #2 and #3 and one for the #4 carb), ....
Click to expand...

To clarify, with the CV carbs, the #3 carb is the "master" carb and has no vacuum sync adjustment. You synchronize #1, #2, and #4 to #3.

reassembly040410_01-1.jpg


The vacuum adjust screw between #1 and #2 (above) will adjust the butterfly valve in #1.

The vacuum adjust screw between #2 and #3 will adjust the butterfly valve in #2.

reassembly040410_11.jpg


The vacuum adjust screw between #3 and #4 (above) will adjust the butterfly valve in #4. There is no adjustment for #3.

More information here:

Synchronize Carburetors
(With the Morgan Carbtune)



Thank you for your indulgence,

BassCliff​
 
Idle mixture screws, sorry im a newb :o, but yes, the screw on the top front of each carb. These are used carbs, not original, and new to me. I have since removed the carbs from the bike and found that the #3 carb idle mixture screw is stripped as well, though i havent come near it with my drill. To clarify, its not the threads that are stripped, but the flathead slot... there is nothing there to get a bite on. #1 and #2 are fine, I can back them all the way out. I've read and hopefully did not misunderstand that these screws should be backed out 2 turns from lightly seated. As I found them, #1 and #2 were seated, not backed out at all. Im 90% sure these are Mikuni BS32 carbs, there are pics on my profile. Thanks
 
If the slot is stripped, is the top of the screw exposed enough to dremel a new one?

Otherwise, you may need to slowly drill with a left-handed bit until it bites to back the screw out. DO NOT USE AN EZ-OUT. Seriously, those things suck and will break, ruining your carb, destroying your manhood, and crushing your soul.
 
SeanMora77 said:
To clarify, its not the threads that are stripped, but the flathead slot... there is nothing there to get a bite on.
Click to expand...

MisterCinders said:
If the slot is stripped, is the top of the screw exposed enough to dremel a new one?
Click to expand...
They are buried rather far down, but there is an easy way to do it with a Dremel and a cut-off wheel.

Just cut a slot in the tower, making sure you are as close to the middle as possible.

Both of these carbs have been slotted for screw removal.

IMG_4081.jpg


.
 
No sir, the screw is far too deep to dremel a new slot. I'll try the left hand drill bit method... Would applying heat help at all?
 
SeanMora77 said:
No sir, the screw is far too deep to dremel a new slot. I'll try the left hand drill bit method... Would applying heat help at all?
Click to expand...
Did you look at Steves post, when you dremal it you will have to slot the tower to get to the screw , but no worries it has been done many times and it works, I would stay away from them with a drill, odds are with the drill you'll be looking for another carb. Look at the pics Steve posted it will work
 
Thanks for posting that Steve, looks like the best solution considering my resources. I'll post results as soon as I get a chance. One more question, does anyone know where I can find a replacement idle mixture screw should I need one?
 
There is a good chance yours might be re-useable, but send me your address, I will send you a screw (or two, if you need them).

.
 
Steve said:
There is a good chance yours might be re-useable, but send me your address, I will send you a screw (or two, if you need them).

.
Click to expand...
Wow, one to two free screws from Steve. You should be honored. :rolleyes:
 
Well, with much disappointment,"and a little embarrassment", I have to report that the slot did not work. Still can't get the screw to budge. I caused too much damage trying to drill it out so carb#4 is now a paperweight, and a stinging reminder to be more patient when a problem like this arises. Two steps forward, five steps back. Thanks for all of your advice. If anyone has a spare carb, or better yet a bank of Carbs they wouldn't mind parting with please let me know. Thanks again.
 
Sorry about your luck, but let's make sure you are not making another mistake. :-k

Which way are you numbering your carbs? :confused:

#1 is under your clutch hand, #4 is under your throttle hand. :o

If nobody comes up with one in the next week, I might be home next weekend, I can check to see if I have one.


.
 
Very kind of you steve, and in this case I was right. It is indeed #4.
 
I'm starting to think these Carbs were bought in a bargain basement down some cruel dark alley... Carb #3 screw does not want to budge either, and on the side of the housing where the screw is there is a scoremark that is right in line with the slot of the screw. Someone else was going to do the same thing. I went even a little deeper than the original slot with my dremel to ensure a sturdy bite and this idle mixture screw is frozen solid. I didn't cause any further damage, it's soaking in wd40 right now... Hoping for the best here, but leaning towards either a whole new bank, or restoring the original Carbs that came with the bike. Any thoughts as to what alchemy could possibly cause these screws to be so stubborn? And, would heat via propane torch make any difference as a last ditch effort?
 
SeanMora77 said:
..., it's soaking in wd40 right now...
Click to expand...
If you are trying to remove the screw, why not use some PENETRATING OIL? :-k

WD-40 is NOT penetrating oil.
noway.gif


Use real stuff, like PB Blaster, Kroil and others, not the 40th attempt at a (very good) Water Dispersant.
shrug2.gif


.
 
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