 Bored out stock carbs.
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Joined: Oct 2012
Posts: 459 Likes: 1
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OP
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Joined: Oct 2012
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I was wondering about boring out my stock carbs as opposed to purchasing new ones. I was wanting to get opinions and info from those of you who have done it. How much does it cost? Where is a good place to get the work done at? How are the performance gain? Thanks in advance guys.
2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.
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Re: Bored out stock carbs.
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Joined: Jan 2006
Posts: 7,702 Likes: 22
Monkey Butt
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Monkey Butt
Joined: Jan 2006
Posts: 7,702 Likes: 22 |
Have you put cams in it yet? You can put bigger carbs on it but you will have to bore your intake and polish it well to marry it up.
I don't believe you are running out of gas with your setup now are you?
Well, my short answer is you have enough gas now. That is a 790 right. Big bore it and cam it. And you will still have enough gas but lots more grunt.
I try to aggravate one person a day. Today may be your day.
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Re: Bored out stock carbs.
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Joined: Oct 2012
Posts: 459 Likes: 1
Adjunct
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OP
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Posts: 459 Likes: 1 |
I'm not running out of gas now. I'm contemplating doing the big bore and from what I have researched the 813 cams do not really give enough of boost over my 790s to make them worth it.
2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.
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Re: Bored out stock carbs.
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Joined: Jan 2006
Posts: 7,702 Likes: 22
Monkey Butt
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Monkey Butt
Joined: Jan 2006
Posts: 7,702 Likes: 22 |
It really depends on what you need for more power. The very nature of that motor you will run out of money trying to get more than 75 HP from it. Putting some more air and fuel into the bike won't do very much at this point. They used to say there is no replacement for displacement. You could spend a few thousand with big bore and head work. But the whole bike, no matter what you spend will be worth about 3 grand all the time now.
But I am a bad person to comment on it. Even if we make our bikes "Fast" for our bikes they are still slow. That is why I have always owned more than one bike. You may look at larger valves and port modifications to help with more air and fuel. Mikuni HSR 42 may be a good match for your bike.
My Victory Kingpin is now worth maybe 5k on a good day. 90RW HP with 110 lbs of torque.
I try to aggravate one person a day. Today may be your day.
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Re: Bored out stock carbs.
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Joined: Aug 2007
Posts: 10,735 Likes: 7
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,735 Likes: 7 |
My dyno sheet is below, the red line shows the 904 with 1mm oversize valves, ported heads, Scepter exhaust and K&N pod filters. Blue line shows run with bored carbs. Black shows bored carbs with port matched billet intakes. I have a huge thread somewhere in here with all the details and pics and info. 
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: Bored out stock carbs.
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Joined: Jan 2006
Posts: 7,702 Likes: 22
Monkey Butt
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Monkey Butt
Joined: Jan 2006
Posts: 7,702 Likes: 22 |
So your blue is 904BB with ported heads, 1mm over valves and a bored carb?
I like the torque line on black.
I try to aggravate one person a day. Today may be your day.
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Re: Bored out stock carbs.
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Joined: Aug 2007
Posts: 10,735 Likes: 7
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,735 Likes: 7 |
Yes, it gained horsepower (especially top end) with bored carbs and then the intakes increased torque.
I just ordered a FireStarter from TTP and will do another dyno run when I get it on with a 9000 rpm rev limit and stage 2 tune
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: Bored out stock carbs.
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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:
Yes, it gained horsepower (especially top end) with bored carbs and then the intakes increased torque.
I just ordered a FireStarter from TTP and will do another dyno run when I get it on with a 9000 rpm rev limit and stage 2 tune
I think your gonna like that TTp Dave.
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: Bored out stock carbs.
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Joined: Oct 2012
Posts: 459 Likes: 1
Adjunct
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OP
Adjunct
Joined: Oct 2012
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So where can one get their stock carbs bored at?
Last edited by JD13; 03/06/2015 9:50 PM.
2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.
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Re: Bored out stock carbs.
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Joined: Jan 2008
Posts: 1,174 Likes: 15
Learned Hand
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Learned Hand
Joined: Jan 2008
Posts: 1,174 Likes: 15 |
Somewhere on here is a thread on actually doing the machine work on the carbs. With pictures.
I did several sets a few years back based on a series of long conversations with fast Fred before he disappeared.
I probably still have the fixtures for making the new butterflies somewhere (but I wouldn't swear to it)
If you have access to milling machine it's pretty straight forward
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: Bored out stock carbs.
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Joined: Oct 2012
Posts: 459 Likes: 1
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As it so happens I am a material handler at a tooling and machining company. If I can dig up that thread I can probably have one of the guys at the shop mill it up for me. Thanks for the advice, it's greatly appreciated.
2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.
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Re: Bored out stock carbs.
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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:
As it so happens I am a material handler at a tooling and machining company. If I can dig up that thread I can probably have one of the guys at the shop mill it up for me. Thanks for the advice, it's greatly appreciated.
If you get this worked out, let me know...& if you can arrange to do a set for me that would be great. I have a set that I can send with the stock throttle plates already pulled.
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Re: Bored out stock carbs.
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Joined: Oct 2012
Posts: 459 Likes: 1
Adjunct
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OP
Adjunct
Joined: Oct 2012
Posts: 459 Likes: 1 |
Quote:
Quote:
As it so happens I am a material handler at a tooling and machining company. If I can dig up that thread I can probably have one of the guys at the shop mill it up for me. Thanks for the advice, it's greatly appreciated.
If you get this worked out, let me know...& if you can arrange to do a set for me that would be great. I have a set that I can send with the stock throttle plates already pulled.
I still have to dig up mag10's old thread and have a look at it but if I can get it worked out I will definitely let you know.
2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.
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Re: Bored out stock carbs.
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Joined: Jan 2008
Posts: 1,174 Likes: 15
Learned Hand
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Learned Hand
Joined: Jan 2008
Posts: 1,174 Likes: 15 |
it took a bit of digging as these were done much longer ago than I thought. http://www.bonnevilleamerica.com/forums/...rt=all&vc=1
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: Bored out stock carbs.
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Joined: Oct 2012
Posts: 459 Likes: 1
Adjunct
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OP
Adjunct
Joined: Oct 2012
Posts: 459 Likes: 1 |
2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.
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Re: Bored out stock carbs.
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Joined: Aug 2007
Posts: 10,735 Likes: 7
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,735 Likes: 7 |
this should give you a few minutes of reading material http://www.bonnevilleamerica.com/forums/...part=1&vc=1
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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