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Rubber Mount Sportster Motorcycle Talk (2004-2006) This area is to discuss issues, problems and anything else unique to the 2004 and above Sportster motorcycles

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  #1  
Old 3 Days Ago
broncobob71 broncobob71 is online now
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Default TC88A makes me smile until WOT

Lurker first time posting. I've read so much on this topic that I can't remember any of it.

After lots of reading here I came to the realization that the cheapest way to increase this bikes power to weight ratio was to loose 50lbs. The easiest way was to throw money at it.

Just finished Putting together
2006 XL1200C
Shortblock Charlie's Scotsman Heads 10:1
Stock valves and springs
adj pushrods
stock lifters
Andrews N4 grind cams
Stock Flat top pistons
new choke cable (been fighting broken compression collar for years)
TC88A factory set for speedo (supposedly)
Supertrapp 2to1 Supermeg 12 disks
SE air cleaner
stock carb jetted at dealer for air cleaner and 50 state leagal slip ons a long time ago

I am not a mechanic, but grasp most concept if they are explained to me enough times with small words and lots of beer and I didn't do the actual wrenching. Guy that did the work does it on the side, but he did go to harley school 25 years ago. (not a slam, just that he learned in an era of not just pushing touch screen buttons)
Took it for a test ride at 5,5,6,0
felt like hit rev limiter pretty low (now sure it was not rev limiter)
raised it, no difference
5,6,7,0
got worse
re read instructions remembered 88 lower compression tried again at 5,4,6,0:5,3,6,0:5,2,6,0
A little better each time, but only works at 80% throttle. WOT feels like slopply version of rev limiter. is it missing or is that what you refer to as THROTTLE FARTS? With advance at 2 or 3 and 80% throttle is pulls like I hoped it would, but if you give it a little too much it goes backwards.

My uneducated guess is carb is on the edge of lean with these now pipes and WOT leans it even more.

Should we put stock ignition module back on and work on jetting before playing with the TC88A some more? I am not opposed loading custom maps once I get around to ordering the cable, just wondering next step for now.
Plus how does the initial timing affect the advance? any recomendations on setting it with the dials for now?

Thank you all for everything I have already forgotten or confused myself with while lurking.
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  #2  
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Default

If the module is stock TC88A the initial switch moves the whole curve,the slope switch changes the curves.
Your '06 uses a VSS setting of 1634
Supertrapp might want more disks or an open cap
Check the jets,maybe a 45 pilot and 180 main,get us number off the needle if possible.
Check the float level,vacuum pet cock ? check the hose from the carb to same
adjustable push rods ? make sure the valves aint too tight.
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Thy Sportster Come
It Shall Be Done
On Earth as it is on Salt
2006 Sportster XL1250C
Hammer Sledge Heads 1.98X1.61 Valves
Hammer 600 Cams
Big Ass CP/Hammer Pistons
Mikuni HSR 45 /Hammer Billet Manifold (Now HSR 48)
Jetted 27.5 slow,182.5 Main
97 Needle,Clip posistion 3
Hurricane Flow 3" offset AC,Rocketman Mod
Daytona Twin Tec TC88A,Rico Scarecrow Map
Sumax Thundervolt plug wires,NGK DCPR8EIX spark plugs. Gapped .040 and Indexed
Cycle Electric Stator and Regulator
Alto Carbonite Clutch
Royal Purple 20W50 MC Primary oil
Patriot Defender Pipe
Royal Purple 20W50 MC Engine Oil
Napa 7148 oil filter
Max Power, 111.47
Max Torque, 84.39
Best 1/4 Mile ET to date 11.85
Best 1/4 Speed to date 115.14
Build by Jester Motorwerkz West
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  #3  
Old 3 Days Ago
clark_zrx clark_zrx is offline
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Default

I'm definitely going with a lean condition. Is it a constant problem or worse at certain rpms? If you give it full throttle and pull the choke out does it go away? Without a tach 6000rpm will be where your ear tells you that typical Harley sound needs to shift, 7000 is screaming. So you're definitely breaking up due to a fueling issue. Pull the plugs and take a picture for us. Plugs will tell you 95% of your tuning problems
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  #4  
Old 6 Minutes Ago
broncobob71 broncobob71 is online now
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