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| Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler. |
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11-21-2009, 12:08 AM
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#1 (permalink)
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Lifetime Premium
Site Supporter SuperSport Favourite Bike: 2007 Thruxton
Join Date: Jan 2008
Location: San Diego, CA
Posts: 1,013
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What's your jetting for your FCR's?
just wondering what those of you who live at sea level are using for jetting of your FCR's? i have the FCR's on my thruxton, 865 motor, 813 cams, ported and polished head with 5 angle valve job, predatirs, ARK, UNI filters...
what are your main jets, pilot lets, how many turns out on your slow air screws and idle mixture screws?
thanks everyone!
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'07 Thruxton, Caspian Blue Checker, FCR's, 813 cams, Pieman ignitor, Predators, ported & polished head...
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11-21-2009, 07:29 AM
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#2 (permalink)
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Loose Head Administrator
Site Supporter Supernova Favourite Bike: 2011 Tiger 800XC
Join Date: Mar 2008
Location: MN, USA
Posts: 21,412 Other Motorcycle: 2007 Bonneville Big Carbs Extra Motorcycle: G12DL, ZX1100, KLR650
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I'm currently running
55 slow, 138 main, FBR needle clip on posn 4. This runs well for me in the cold temperatures. Once it gets back up above 60 degrees I use the EMR needle with clip on position 6.
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11-21-2009, 10:58 AM
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#3 (permalink)
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Senior Member
Supersport 600 Favourite Bike: 2001 BONNIE
Join Date: May 2008
Location: New Hampshire
Posts: 154
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fcr set up
Hello again sbpark,
I responded to one of your earlier lines, my set up was determined with the use of the AF gauge I spoke about.
I use Domminator touring pipes and Uni filters, head is stock.
I have an early 2001 790 Bonnie, for some reason my bike set up differently, what it is cams, heads, I don''t know, but I haven't ruled out faultly fuel pump adjustment yet. I plan on making the fuel pump manuel, off of the throttle in the spring. You can reach in behind the heads and push the plunger down with your finger.
So having said that, my set up is as follows:
The following set up ran well at 30.3 in pressure 75F 50% rh, I'm 300-600 feet above sea level normally.
Needle DVR slot #5 from top
Main 148
Slow jet 55
Main air jet 200
Fuel screw 1 5/8
Air screw 1 1/2
Idle screw left 1
Idle screw right 1
As I mentioned before you need to find and be able to change all of the above. It takes a while to learn what items effect the various areas of the AF curve.
When you adjust the air and fuel screws, before you do, scribe a line as a reference to move from, I have found that 1/8 turn adjustments are enough when you're close in this area of the AF curve.
Keep at it
Hoopla
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Investing in a better Bonnie one step at a time
Last edited by HOOPLA; 11-21-2009 at 11:01 AM.
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11-21-2009, 09:47 PM
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#4 (permalink)
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Lifetime Premium
Site Supporter SuperSport Favourite Bike: 2007 Thruxton
Join Date: Jan 2008
Location: San Diego, CA
Posts: 1,013
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wow, 72 views and only 2 replies?! i know everyone's jetting will be different since a lot of us have different mods, displacement, etc, but c'mon!
anyway, i think i finally got the carbs dialed in fairly well. started a seperate post on what i ended up with and how i got there...
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'07 Thruxton, Caspian Blue Checker, FCR's, 813 cams, Pieman ignitor, Predators, ported & polished head...
Last edited by sbpark; 11-21-2009 at 10:17 PM.
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11-23-2009, 02:59 PM
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#5 (permalink)
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Senior Member
Supersport 600 Favourite Bike: 2001 BONNIE
Join Date: May 2008
Location: New Hampshire
Posts: 154
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I'm not surprized that you got so few responces, cause I don't think many people have tuned their own carbs.
The responces you do get are good in general, don't hope for an exact set up that's why you need to get an AF gauge or spend lots of time on the dyno.
Hoopla
__________________
Investing in a better Bonnie one step at a time
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11-23-2009, 03:42 PM
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#6 (permalink)
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Senior Member
SOTP Vintage Series Favourite Bike: 03 T100
Join Date: Mar 2007
Location: richmond va
Posts: 6,078
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Quote:
Originally Posted by HOOPLA
I'm not surprized that you got so few responces, cause I don't think many people have tuned their own carbs.
The responces you do get are good in general, don't hope for an exact set up that's why you need to get an AF gauge or spend lots of time on the dyno.
Hoopla
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+1 on that and one thing that all of us that know alittle about tuneing motors there is no one size that fits all thats why its called tuneing.what works on one guys bike may be way off on anothers.
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Why do I feel young on my bike
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11-23-2009, 05:36 PM
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#7 (permalink)
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Lifetime Premium
Site Supporter SuperSport Favourite Bike: Bonnie Black Special
Join Date: Feb 2007
Location: Bournemouth, England
Posts: 1,036
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These are the details of an 865 running FCR39's.
Staintunes, DNA Pods, Keihin FCR39's, headwork, Wiseco 10.5:1 pistons, 813 cams, Igniter mods.
145 mains
55 pilots
OC-EMR (pos 5)
P1.5
A1.75
Last edited by PieMan; 11-23-2009 at 05:43 PM.
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11-23-2009, 06:07 PM
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#8 (permalink)
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Lifetime Premium
Site Supporter SuperSport Favourite Bike: 2007 Thruxton
Join Date: Jan 2008
Location: San Diego, CA
Posts: 1,013
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Quote:
Originally Posted by PieMan
These are the details of an 865 running FCR39's.
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those numbers look great with that set-up with the higher compression on the stock motor.
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'07 Thruxton, Caspian Blue Checker, FCR's, 813 cams, Pieman ignitor, Predators, ported & polished head...
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11-23-2009, 06:18 PM
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#9 (permalink)
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Senior Member
SOTP Vintage Series Favourite Bike: 03 T100
Join Date: Mar 2007
Location: richmond va
Posts: 6,078
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Thats pretty good mike what did the head have done to it? os valves?
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Why do I feel young on my bike
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11-23-2009, 06:27 PM
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#10 (permalink)
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Lifetime Premium
Site Supporter SuperSport Favourite Bike: Bonnie Black Special
Join Date: Feb 2007
Location: Bournemouth, England
Posts: 1,036
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Porting with OEM valves.
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