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6th April 2008
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Biker
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Join Date: Sep 2006
Posts: 9 Sportster/Buell Model: 1200 custom Sportster/Buell Year: 2006
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06 1200C dyno results need help
I had my bike dyno yesterday and I having problems with the air\fuel ratio. I t would spit and sputter when he would first start the dyno run and the pick up and smooth out. I’m not sure what adjustments the carburetor needs at this point. The engine is stock except for the SE slip ons, N4 Andrews cams, HSR42 carb. I did change the main jet from a 160 to a 155 today. The top dyno run is mine and the bottom one was for comparison
Here are my Specs.
A/C Arlen Ness Big Sucker
ENGINE: 2006 1200c
EXHAUST SE slip on's
INGNION Stock
LOWER END: Stock
CAMS Andrews N4
CYLINDERS: Stock 1200
CARBURETER Mikuni HSR 42
PISTONS: Stock
HEADS: Stock
HP 81
TQ 78
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6th April 2008
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XL FORUM TEAM MEMBER
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Join Date: Nov 2004
Location: cordova, tn
Posts: 12,646 Sportster/Buell Model: xl1218rr turbo Sportster/Buell Year: 1993
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It is a little hard to read the a/f looks like it went a little lean between transitions between jets. I know nothing about Mikunis so I can't comment about jetting or adjustment. The h/p looks about right.
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Spoiled but definitely not rotten. Started life as a black 1993, 1200 Now-1218, Home ported 2009 FI heads, SE 551 cams, Aerocharger variable vane turbo. Dyna2Ki, JMC aluminum swingarm, Chainsikle custom mid forward controls, GBC inverted front end, 3 degree wide-glide trees and 5 degree raked cups. 18x5.5 fatspoke rear with 150/60 and 21x3.5 with 120/70. 
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8th April 2008
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Biker
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Join Date: Sep 2006
Posts: 9 Sportster/Buell Model: 1200 custom Sportster/Buell Year: 2006
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Anybody have any comments on the hsr 42
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8th April 2008
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XL FORUM TEAM MEMBER
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Join Date: Nov 2006
Location: Salina, Ks
Posts: 1,120 Sportster/Buell Model: 1200 Custom Sportster/Buell Year: 2005 Sportster/Buell Model #2: XLX Sportster/Buell Year #2: 1985 Other Motorcycle Model: Yamaha Vino 125 Other Motorcycle Year: 2006
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Decent numbers. What A/C?
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2005 XL 1200 Custom; NRHS 1250 Conversion, 10.5 - 1; Stage 2 Heads; SE 536 Cams; Jim's Hydrosolid lifters; NRHS adjustable pushrods; S&S Roller Rockers; Crankshaft by Darkhorse Crankworks; HurricaneFlow A/F; Hurricane Oil Filter; Mikuni HSR-42; S&S Intelligent Spark Technology Ignition; RB Racing LSR exhaust; Front and Rear Progressive Suspension; Oversize front tire; Superbrace Fork Brace; Speedway Microtach, lots of other bits and pieces.
THE $16,000  Sportster!
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8th April 2008
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XL FORUM TEAM MEMBER
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Join Date: Mar 2006
Posts: 519 Sportster/Buell Model: xl883c Sportster/Buell Year: 2003
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Stock air cleaner?
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 Pretty Boy Robert of the Hungry Horses MC
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8th April 2008
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Senior Chief Master Mechanic
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Join Date: Dec 2005
Posts: 956 Sportster/Buell Model: Honda CBR 929RR Sportster/Buell Year: 2000
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Looks like right around 1700-1800 there's a hell of a lean spot. Is that right around where the spit and sputter is? If so, you narrowed down you're problem a little bit. I too have no experience with the Mikuni. I would think that it's the spot where you're transitioning from the idle circuit to the full throttle circuit if Mikuni's have the same setup as a CV. If that's the case, you can fatten up the slow jet and see what it does for you.
Hopefully someone who's actually tuned with one of these will chime in here and help out.
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8th April 2008
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Biker
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Join Date: Sep 2006
Posts: 9 Sportster/Buell Model: 1200 custom Sportster/Buell Year: 2006
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The air cleaner is a Arlen Ness Big Sucker
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