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Old 01-02-2017, 02:26 AM   #1 (permalink)
FNG :)
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Trampas2010 wants to know Dino or Syn?
05 fat boy cvo

I inherited this bike and just wondering what kind of performance upgrades are recommended.
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Old 01-02-2017, 08:38 AM   #2 (permalink)
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Location: mn
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hdrider82 wants to know Dino or Syn?
Welcome to the forum. That's a nice bike. I know someone that has one. I'd split the case and do a 117" or 124" build. That's just me. Those kind of upgrades are personal. What ever makes you happy. A lot of people,,, including my friend that owns one wants it left stock. Go figure??? There is that (SEARCH) tab at the top of the page. There is more stuff here on builds then you will want to look at. Enjoy!!
When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute and it's longer than any hour. That's relativity.


2003 fxstsi
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Old 01-19-2017, 10:00 PM   #3 (permalink)
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Location: Avondale,AZ.
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TIMINATOR wants to know Dino or Syn?
my Fatboy

My 2005 Fatboy had a Woods TW-6 (240 deg .510 lift) which I thought was stupid as that cam has a lower lift than stock, AND they had a 4 degree advance gear in there too. Exhaust was V&H Big Shots, .050 milled heads, and a no name forward facing K&n type air cleaner. It had decent bottom end torque, but was all done by 4800 rpm. Dyno showed 88rwhp. BARF!!! Next I installed V&H Pro Pipe 2 into 1s, ported and smoothed the inside of the cast aluminum air cleaner elbow, radiused the inside of the air cleaner element exit and the elbow tube, side gapped and indexed the plugs (Platinum+ Champions), it had fine wire platinum NGKs in it, (the fine wire plugs are for smog use and 50k mile longevity in my book and suck for performance). Not to make too long of a sentence there, did my standard mods to the V&H muffler for better flow (I have a flow bench), and the new dyno pull netted 102.3 rwhp and it pulled to 5400 rpm. Much better throttle response and gained 4-6 mpg too!
Now on to the good stuff... I then pulled the heads, ported them (remember I have a flow bench), installed 1.94" intake valves, did a 5 angle valve job, polished the chambers, installed a Zippers 54 mm T body and large port manifold (I opened up the runners to that size when I ported the heads), used a .030" head gasket, H-D 110" drop in jugs with Wiesco Forged flat top pistons, and a H-D 257 cam (252/260 duration and .569 lift).
Whew! We started that Monday afternoon at 1:30 and finished it by 3:00 Thursday afternoon. Also installed the Thunder Max self tuner with 2 wide band O2 sensors, it was everything that was advertised for it!
Dynoed at 127 rwhp! On pump gas (compression was set at 10.83 as cc'd. Throttle response is awesome, and I can light the rear tire anywhere in first, second and going into third for about 100-150 feet... Conservative driving nets 39-40 in town, and up tp 46+ on the road. No complaints here! Also forgot, we set the deck height at .005", as received it was right at .019". Remember these Screamin' Eagle heads are a true Hemi open chamber type and have no quench area at all except for a band about .150 wide as manufactured. Milling .050 from them widens the quench a bit as does the bigger bore cylinders too, you end up with a quench band of about ,290" wide. We also installed valve springs that accommodate up to .680" lift as I am still playing! Keep in mind that the valves WILL hit each other with this cam in these heads due to the valve angle, so you MUST angle cut the front of the exhaust valve for clearance! Don't be scared! We do that anyway to enhance exhaust flow!
I hope some of this info helps...


Modesty is a crutch for the incompetent!
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Old 03-15-2017, 02:01 PM   #4 (permalink)
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Location: Tulsa, Ok
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rab986 wants to know Dino or Syn?
Originally Posted by Trampas2010 View Post
I inherited this bike and just wondering what kind of performance upgrades are recommended.
I dont believe you - Prove it!

I love pics of CVO's Oh, what part of Misery are you from?
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Old 03-19-2017, 07:48 AM   #5 (permalink)
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Location: Avondale,AZ.
Posts: 73
TIMINATOR wants to know Dino or Syn?
The modified (to fit the 54mm throttle body) stage 1 air cleaner was replaced with a home brew forward facing unit made from a chunk of 1/2" aluminum plate and an aluminum "U" bend, see pics. The V&H Propipes (with modified muffler) were too small (1 3/4" straight primary pipes and 2 1/4" collector) and restricted the top end, the HP curve went totally flat for the last 500 RPM. But in the Pro Pipes defense it did make 121.8 RWHP! It nosed over at 5600 rpm and was completely flat till 61-6200 rpm.
Soooooo- We installed Drago's Dragula IIIs, that is a 3 step pipe: 1 3/4" , 1 7/8", 2" with a 2 1/2" merge collector and a 3" baffle. Regarding the 3" baffle, its waaay too quiet, and I never woulda guessed!
It has a soft, muffled "I'm innocent" sound, and it actually annoyed me! Since it is an inside stamped, cupped, louvered "glasspack" I did my usual make-it-flow-better-and-louder mod, I ground the tips of the louvers off about .035" with a stone wheel in a die grinder with a loooong shank. Result: 3% better flow and a slightly edgier sound. Just what I was looking for!
The dyno showed a raised and slightly peakier RWHP curve at 124.9.
The Dragula IIIs lost about 1-2 mpg (40 in town and 43 on the road if I drive it respectably) and a noticeable torque loss below 3000 rpm, but I ride "on the right side of the tach" more often than not. That small bottom end torque loss and going to a Dunlop 502GT 150-80/16 tire (same size) now allows me to pedal it and get a much better launch, and the other bright side to all of this is it torques the front wheel up 3-4" after the 2nd and 3rd gear shift. Waaaay cool!
P.S heres a pic of the modified V&H Baffle and my home made air cleaner.
After a race if the victim stays around to ask what happened, my smartass reply is: "You just got beat by an old fat guy on an old Fatboy! TIMINATOR
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Modesty is a crutch for the incompetent!

Last edited by TIMINATOR; 03-28-2017 at 08:10 AM.
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