Redback Motorcycle Smash Repairs - 1/ 9 Collie St, Fyshwick. Ph: 6280 5433

JR's 1982* HD FXR

Discussion in 'My Bike' started by John.R, Mar 20, 2016.

  1. davo231481
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    davo231481 Member

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  2. John.R
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    John.R Member Supporter

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    Brief update.

    Im in talks with a young local fabricator whos real keen to have a crack at the exhaust. Looks like itll happen from the 4th, will talk finer details before then.

    Im tossing up heatshield ideas, alloy or CF? CF would probably make a better shield, but wouldnt really suit as much as a brushed and slotted alloy type setup.

    Also trying to source a late 80s/early 90s Screamin Eagle air filter cover. I was trying to find the original air filter cover. The originals are brushed alloy with polished alloy letters, but theyve all got the models on the actual air filter. So its a bit hard to find original Superglide ones, easy to find Fatboy ones etc

    Anyway, S.E ones are a bit of old school cool.
     

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  3. metaltriumph
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    metaltriumph Member

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    I always think the harley air filter covers are so daggy. Maybe a simple K&N filter with a alu or steel disc would suit. eg

    [​IMG]

    Brush the cover to remove the shine or paint it blackkkkkkkk
     
    #23
  4. John.R
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    John.R Member Supporter

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    A lot of them are pretty average, either super gawdy (iron cross, skulls) or they're crazily machined and 3d (RSD)

    I like the original circle style. There's a couple that fit it, and lots of aftermarket options, but Im liking the Screaming budgy at the moment.
     
    #24
  5. John.R
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    John.R Member Supporter

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    Still looking at airfilters, turns out you can still get Screamin Eagle kits from the dealership, just that they come with the new style logo, not the old 80's one.
    The difference isn't big enough to make me pick the old style and buy a 20yr old 2nd hand job, vs a brand new one from HD for the same price lol. You can always just buy the ring insert anyway.

    New style:
    [​IMG]

    Old school (and better logo)

    [​IMG]

    I haven't ordered it because im looking for something a bit smaller, that one is 8in in diameter.. these ones are a bit smaller:
    [​IMG]

    [​IMG]

    There's literally a million choices, so I'll keep searching. I like the chequered flags one though.


    I also ordered a Baker Tranny dipstick. The Evo's come with a metal dipstick, but apparently over time, the vibrations from the engine create a sort of harmony/resonance in the dipstick, which fatigues it over time till it snaps off and munches your tranny. Fun times. Apparently they changed them to plastic in later model engines, but Baker make a machined thicker dipstick that does the job.
    [​IMG]
     
    #25
  6. Lurch
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    Lurch Capt. Sense of Direction Administrator

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    Did you ever see the ones I made for the 109?
     
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  7. John.R
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    John.R Member Supporter

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    Negative.

    I've seen a few how to's on making generic air filters though.
     
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  8. Lurch
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    Lurch Capt. Sense of Direction Administrator

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  9. John.R
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    John.R Member Supporter

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    Very nice, especially for a DIY jobbie
     
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  10. SJM
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    SJM Member

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  11. John.R
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    John.R Member Supporter

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    Not bad, couple of decent ones on there.

    BCM makes some good ones, but now its got me tripping if these are slightly TOO small @ 1 1/4” x 4”, bit of reading on the Sporty forums has some gurus thinking they might be a bit too small, but nobodies thrown em on the Dyno. Obviously BCM claim they are done by guru's and use a vortex etc lol

    [​IMG]
    [​IMG]
    [​IMG]


    Maximum complication for minimal result for each decision haha
     
    #31
  12. John.R
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    John.R Member Supporter

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    So since I'm curious, why not determine the minimum size filter we need for this high performance tractor?

    K&N Facts sheet says to use A=(CID X RPM) / 20,839

    A = effective filtering area (not including sealing surface on edges)
    CID = cubic inch displacement 1340cc = 82ci
    RPM = revolutions per minute at maximum power, Im just gonna use Max RPM, approx 5300rpm w/ stock ignition module for a bit of safety margin.

    A= (82 X 5300) / 20,839 = 20.85 square inches is what K&N claims to be the minimal surface area for optimum performance.

    "Once you decide on the size of your round filter, use the following formula to determine the height of the filter to achieve the required surface area. Take the derived effective filtering area, divide by the filter diameter, multiply by 3.14. Then add 0.75" to accommodate the rubber seals."

    (0.5in used as rubber edge)

    H=Area / (Diameter x 3.14) +0.5

    A = effective filtering area
    H = required height
    D = outside diameter of the filter
    3.14 = pi
    0.5 = the rubber end caps

    H=20.85 / (4.625 * 3.14)+0.5= 1.94 inches tall

    So maybe the BCM JJ @ 4.625in x 1.25in may be a little on the small side, but function follows form and I don't really care.

    I know this isn't factoring the absolute myriad of other factors that impact airfilters etc, but close enough is good enough.
     
    #32
  13. G-relk
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    G-relk Moderator Staff Member Moderator

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    I think the performance difference would be so insignificantly small as to be non-existent, if indeed there is any difference at all.

    That one in the last photo looks properly nice though.
     
    #33
  14. John.R
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    John.R Member Supporter

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    I think you're right too @G-relk lol. But as always, maximum complications.

    The R1 is for performance. This is just for fun.

    Last one is the JJ, the one im leaning towards at this stage, especially in brushed over polished.

    http://bcmmoto.bigcartel.com/product/the-jj
     
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  15. G-relk
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    G-relk Moderator Staff Member Moderator

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    Oh, of course. Wouldn't be a modified bike without some form of complication :p

    Yup, brushed is definitely the way to go.
     
    #35
  16. John.R
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    John.R Member Supporter

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    Not much in the way of updates, went around and had a chat to the bloke about my exhaust. Checked out some of the stuff he was working on (XR tracker replica which he was just finishing up, a soon to be turbo shovel, and a massive board tracker with 26in machined wheels and 100ci Evo donk), he showed me pics of a twin turbo Evo he built for shits n gigs. Very cool stuff.

    We talked about some ideas and routing, 2-1 or possibly 2-1-2 cans with like a X pipe, as well as heat shield tabs. 2 cans might be a good idea because pillion calf clearance, and form factor. We'll see. Probably kick it off within the month.

    I've been scabbing as much HD parts as I can, just to build a stock pile and trade for other stuff. Dad donated his old fatty pipes and air cleaners, and I managed to pick up a set of brand new TC96 heads, barrels, pistons, cams, manifold & injectors for $100, all taken off before it left the dealership to fit a 103 kit. Won't fit on the Evo, but TC's can be fitted to FXR's frame with a little modification of the pan, and the barrels are good to be bored to 103. I'll keep an eye out for a blown TC engine get it up and running on the cheap.

    I'll also be giving a list of parts to a family HD contact back home to try and help me source bits and pieces, he brings in a couple of containers of HD's from America every year, and is always over there. Stuff like original seat, tranny cases (specific to FXR because of the rear mount), tranny parts, wheels, tins etc

    [​IMG]

    [​IMG]
     
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  17. Lurch
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    Lurch Capt. Sense of Direction Administrator

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    I think the pod filter is a bit too modern for the FXR
     
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  18. John.R
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    John.R Member Supporter

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    It's is just spare, but I quite like it. Doubt it'll go on the bike, but I don't beleive its too modern, FXR's are 82-94, and they were all the rage back then.
     
    Last edited: Apr 4, 2016
    #38
  19. lucifer_mr2
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    lucifer_mr2 Veteran Member Veteran Member Supporter

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  20. John.R
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    John.R Member Supporter

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    I saw that one in braddon the otherday, looks even worse in person haha
     
    #40