A
Anonymous
Guest
okay my question is why is there a rubber plug covering a jet and can u leave the plug out :lol:
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wrench
Guest
Re: carb plugs anyone know much about them
Why not try it and let us know how it pans out :lol: :lol: :lol: :lol:
shineoneforme said:
Why not try it and let us know how it pans out :lol: :lol: :lol: :lol:
S
Scud
Guest
The jet in question, I believe, is the pilot jet circuit. This jet is solely for the purpose of idle and low rpm operation. If you pull that plug you will more then likely run way rich and foul plugs. Only a small amount of fuel is needed for idle and 'pulling the plug' will add way too much. But as Wrench said, try it and let us know the results, I am interested also. 
Scud
Scud
A
Anonymous
Guest
My understanding is that the plug needs to be in place.
Re: carb plugs anyone know much about them
My question is this: If the engineers designed the carbs so as to need those plugs and included them, why would you think you can leave it out? NO, if there was no reason for them to be there, then they would not be there.
Earl
My question is this: If the engineers designed the carbs so as to need those plugs and included them, why would you think you can leave it out? NO, if there was no reason for them to be there, then they would not be there.
Earl
shineoneforme said:
J
Jackrp
Guest
Re: carb plugs anyone know much about them
The answer is "Yes" you can leave the rubber plugs out, done it myself, BUT! the down side is, your bike will run like S#@! so if it were my choice I'd put them in.or if you do leave them out carry a lot of spare spark plugs so you get home again.
shineoneforme said:
The answer is "Yes" you can leave the rubber plugs out, done it myself, BUT! the down side is, your bike will run like S#@! so if it were my choice I'd put them in.or if you do leave them out carry a lot of spare spark plugs so you get home again.
W
wrench
Guest
Re: carb plugs anyone know much about them
But Earl i thought engineers designed things so that you could fix them :-k :wink: :lol:
earlfor said:
But Earl i thought engineers designed things so that you could fix them :-k :wink: :lol:
Re: carb plugs anyone know much about them
Well John, y'know how it goes around here. LOL My aircleaner is too hard to put back in, can I leave it off? My carb jets are difficult to screw in, do I have to put them in? I dont see why there are rubber plugs, do I need them? My tires keep losing air, can I leave the wheels off.
Uhhh, problem, my bike doesnt run and it doesnt roll any more. HELP!
Earl
Well John, y'know how it goes around here. LOL My aircleaner is too hard to put back in, can I leave it off? My carb jets are difficult to screw in, do I have to put them in? I dont see why there are rubber plugs, do I need them? My tires keep losing air, can I leave the wheels off.
Uhhh, problem, my bike doesnt run and it doesnt roll any more. HELP!
Earl
wrench said:
P
ptm
Guest
Do the VM carbs on a 78 750 have those plugs? I'm about to dive into my first carb rebuild this weekend and I thought I had all the parts I needed. I've read several threads that mention those plugs, but I'm not sure if my carbs have them. I don't see anything like that in the schematics.
A
Anonymous
Guest
carbs
carbs
VM's don't have them, they have other fun things to contend with so don't feel left out, and them there screws that you can turn in on the top side and bottom of you take them out count the number of turns in first then take them out do not screw them down tight, only very lightly
carbs
VM's don't have them, they have other fun things to contend with so don't feel left out, and them there screws that you can turn in on the top side and bottom of you take them out count the number of turns in first then take them out do not screw them down tight, only very lightly
J
jtcrespo
Guest
Re: carb plugs anyone know much about them
While we're on the subject Earl, The oil in my bike keeps getting dirty and there is a small leak that I assume was "engineered" into the motor because I see sooooo many posts about oil leaks.
My question is this: Can I just leave the oil out? :lol: :lol: :lol:
shineoneforme - Don't worry, we jest with you out of love! :lol: :lol:
earlfor said:Well John, y'know how it goes around here. LOL My aircleaner is too hard to put back in, can I leave it off? My carb jets are difficult to screw in, do I have to put them in? I dont see why there are rubber plugs, do I need them? My tires keep losing air, can I leave the wheels off.
Uhhh, problem, my bike doesnt run and it doesnt roll any more. HELP!
Earl
While we're on the subject Earl, The oil in my bike keeps getting dirty and there is a small leak that I assume was "engineered" into the motor because I see sooooo many posts about oil leaks.
My question is this: Can I just leave the oil out? :lol: :lol: :lol:
shineoneforme - Don't worry, we jest with you out of love! :lol: :lol:
J
jtcrespo
Guest
Thanks Earl!!! :lol: I knew you would know :lol: :lol:
Re: carb plugs anyone know much about them
Removing it won't change the jetting or the fuel flow in any way. The amount of fuel that passes to the carb throat is regulated by the size of the pilot jet hole.
So even if you remove the plug, this "second passage" can't add any fuel volume. The pilot jet will still regulate the flow. The main jet and the plugged or unplugged entrance to the pilot jet are both immersed in fuel, so the unplugged pilot jet entrance wouldn't suck air either.
The rubber plug over the pilot jet is just an anti-tampering plug.shineoneforme said:
Removing it won't change the jetting or the fuel flow in any way. The amount of fuel that passes to the carb throat is regulated by the size of the pilot jet hole.
So even if you remove the plug, this "second passage" can't add any fuel volume. The pilot jet will still regulate the flow. The main jet and the plugged or unplugged entrance to the pilot jet are both immersed in fuel, so the unplugged pilot jet entrance wouldn't suck air either.
Re: carb plugs anyone know much about them
That makes perfect sense and I would have to say is correct from a logical point of view. However, in practice, I have noted a big difference between how my CV carb'd 750 idled with and without the plugs. Possibly, the plugs compensated for some other factor. As for the plugs being an effective anti tamper device, I suspect they would only be effective on bikers without opposed thumbs. LOL
Earl
That makes perfect sense and I would have to say is correct from a logical point of view. However, in practice, I have noted a big difference between how my CV carb'd 750 idled with and without the plugs. Possibly, the plugs compensated for some other factor. As for the plugs being an effective anti tamper device, I suspect they would only be effective on bikers without opposed thumbs. LOL
Earl
KEITH KRAUSE said:
I can't explain why your bike would idle differently. If you look at the diagram of the CV carbs, at least the '80/81 1100 models, the fuel enters the main jet, goes through a passage, then to the pilot jet. The pilot jet entrance where the plug is, is just a little higher (carbs mounted-in relation to bowl fuel level) than the main jet. Both are still submerged in fuel. So removing the plug wouldn't change fuel flow. The rubber plugs are a feeble attempt to stop tampering, as are the metal caps over external mixture/pilot/air screws.
Other CV carbs could be modified from what I'm looking at though.
Other CV carbs could be modified from what I'm looking at though.
yep, you're exactly right on the fuel flow and pathways, beats the devil outta me. I only found the difference because the old plugs were so hardened, I couldnt get them reinstalled, so put everything back together and had the bike running while I ordered replacement plugs. When the new plugs arrived, I installed them and there was an obvious difference in the idle.
So, my inclination is yes, the plugs should be installed, but from a logical view I dont see why they make a difference.
ahhh, but then, there are quite a few things I'll probably never understand.
Earl
quote="KEITH KRAUSE"]I can't explain why your bike would idle differently. If you look at the diagram of the CV carbs, at least the '80/81 1100 models, the fuel enters the main jet, goes through a passage, then to the pilot jet. The pilot jet entrance where the plug is, is just a little higher (carbs mounted) than the main jet. Both are still submerged in fuel. So removing the plug wouldn't change fuel flow. The rubber plugs are a feeble attempt to stop tampering, as are the metal caps over external mixture/pilot/air screws.
Other CV carbs could be modified from what I'm looking at though.[/quote]
So, my inclination is yes, the plugs should be installed, but from a logical view I dont see why they make a difference.
ahhh, but then, there are quite a few things I'll probably never understand.
Earl
quote="KEITH KRAUSE"]I can't explain why your bike would idle differently. If you look at the diagram of the CV carbs, at least the '80/81 1100 models, the fuel enters the main jet, goes through a passage, then to the pilot jet. The pilot jet entrance where the plug is, is just a little higher (carbs mounted) than the main jet. Both are still submerged in fuel. So removing the plug wouldn't change fuel flow. The rubber plugs are a feeble attempt to stop tampering, as are the metal caps over external mixture/pilot/air screws.
Other CV carbs could be modified from what I'm looking at though.[/quote]
Well, at least this "problem" can be avoided by simply re-using the plugs and then there's no question.