 Do I need a bigger main jet?
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Joined: Sep 2011
Posts: 7
Complete Newb
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OP
Complete Newb
Joined: Sep 2011
Posts: 7 |
06 790 America
Sceptres
AI removed
Thruxton needle, 1 shim
Just removed airbox and installed pods using BellaCorse's DIY kit.
BC sent me 45 pilots and 145 mains. I still get pretty significant popping on decel, and a slow roll on from idle. I notice that dinqua's calculator recommends 45/149 jets.
Before I go ordering bigger main jets, I'm curious if the literati think this will help my popping and sluggish response off of idle.
Lisa
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Re: Do I need a bigger main jet?
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Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
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Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
How many turns out on the pilot screws?
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Re: Do I need a bigger main jet?
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Joined: Sep 2011
Posts: 7
Complete Newb
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OP
Complete Newb
Joined: Sep 2011
Posts: 7 |
I've read tons about these carbs, but not all of it sticks.  In re-reading some old carb tuning posts I'm reminded that the mains primarily are in charge of the WOT area of operation, so prolly have nothing to do with my popping, and definitely nothing to do with my sluggish roll on from closed throttle. So much to remember! And confusals!  Especially with all the different intake/exhaust configurations..
Lisa
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Re: Do I need a bigger main jet?
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Joined: Sep 2011
Posts: 7
Complete Newb
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OP
Complete Newb
Joined: Sep 2011
Posts: 7 |
uh... welllll.... ok, you got me.  See, I couldn't find my d-tool the other day when I was tinkering, so, uh, well, you know... 
Lisa
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Re: Do I need a bigger main jet?
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Joined: Sep 2011
Posts: 7
Complete Newb
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OP
Complete Newb
Joined: Sep 2011
Posts: 7 |
No, No! Bad Bykme! No biscuit! 
Lisa
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Re: Do I need a bigger main jet?
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Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
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Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
When it comes to tuning carbs, ya gots ta know where ya is, to gets ta where ya wants to be...
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Re: Do I need a bigger main jet?
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Joined: Jul 2011
Posts: 2,212
Oil Expert
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Oil Expert
Joined: Jul 2011
Posts: 2,212 |
Quote:
When it comes to tuning carbs, ya gots ta know where ya is, to gets ta where ya wants to be...
2007 Speedmaster and miss it!
2013 T-Bird Storm and Luvin it!
Catching a yellow jacket in your shirt at 70 mph can double your vocabulary
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Re: Do I need a bigger main jet?
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Joined: Apr 2007
Posts: 3,063 Likes: 8
Loquacious
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Loquacious
Joined: Apr 2007
Posts: 3,063 Likes: 8 |
Uh huh....uh huh 
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: Do I need a bigger main jet?
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Joined: Sep 2010
Posts: 8,393 Likes: 1
Second Wind
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Second Wind
Joined: Sep 2010
Posts: 8,393 Likes: 1 |
Maybe you should start by turning the pilot screws all the way in until it stops don't tighten thought just till ya feel it touch. then turn them out 2 full turns. Use a marker to keep track. I put the tool on and draw a little line on the tool and the housing to make sure I get precise turns.
See how it runs then.
Last edited by locopony; 03/18/2012 11:03 AM.
I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago.
Edgar Allan Poe
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Re: Do I need a bigger main jet?
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Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
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Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
Quote:
Nope you need this http://xxxcarburetors.com/productpage.html
and it will be available soon.
A Super E ?
Nah. Right now the OP needs to know how many turns out his pilot screws are...
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Re: Do I need a bigger main jet? *DELETED*
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Joined: Sep 2010
Posts: 8,393 Likes: 1
Second Wind
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Second Wind
Joined: Sep 2010
Posts: 8,393 Likes: 1 |
Post deleted by locopony
Last edited by locopony; 03/17/2012 6:37 PM.
I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago.
Edgar Allan Poe
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Re: Do I need a bigger main jet?
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Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
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Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
Quote:
...Its an air foil
It is understandable that you are excited by your project, however if your gonna pimp this stuff as a threadjack then perhaps a better way to go is to ask FJ for permission to do it in the vendor section.
If the OP can determine what his pilot screw settings are then maybe someone can actually help him.
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Re: Do I need a bigger main jet?
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Joined: Sep 2010
Posts: 8,393 Likes: 1
Second Wind
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Second Wind
Joined: Sep 2010
Posts: 8,393 Likes: 1 |
I got ya and you are right so I fixed it. Sorry I didn't mean it to come out like that.
I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago.
Edgar Allan Poe
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Re: Do I need a bigger main jet?
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Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
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Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
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Re: Do I need a bigger main jet?
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Joined: May 2007
Posts: 6,432 Likes: 1
Worn Saddle
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Worn Saddle
Joined: May 2007
Posts: 6,432 Likes: 1 |
Take out the shim, determine where your mix screw setting is set and start from a baseline you can be certain about. Your pilot jets are big enough that an adjustment to the mix screw will solve the popping. I believe the shim is the culprit in the slow roll on.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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Re: Do I need a bigger main jet?
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Joined: Jan 2005
Posts: 11,126 Likes: 13
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 11,126 Likes: 13 |
Quote:
Quote:
...Its an air foil
It is understandable that you are excited by your project, however if your gonna pimp this stuff as a threadjack then perhaps a better way to go is to ask FJ for permission to do it in the vendor section.
If the OP can determine what his pilot screw settings are then maybe someone can actually help him.
Lisa is a she.
Blowing gravel off rural roads
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Re: Do I need a bigger main jet?
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Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
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Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
Quote:
Lisa is a she.
Ya well, so was Chas Bono...not that there's anything wrong with that... 
Seriously, I didn't notice that in the signature. My bad. 
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Re: Do I need a bigger main jet?
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Joined: Jan 2005
Posts: 18,825
"Lighten up, Francis."
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"Lighten up, Francis."
Joined: Jan 2005
Posts: 18,825 |
Wait, there's a girl on this site?  You guys behave yourselves! Don't drive her away like you've done with almost all the rest!  
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