R90/6 Texas Dirtbike rebuild

Discussion in 'Airheads' started by DiabloADV, May 9, 2012.

  1. limeymike

    limeymike Who Me?

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    Sorry, late to the build party, nice job indeed.

    More pls...:*sip*
    #61
  2. DiabloADV

    DiabloADV Semi-Occasional

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    This came in today's mail. Should work great for relocating the battery up under the seat pan. I'm making a little tray for the battery and other electronics. This brand of Li battery has the charger/balancer electronics built into the case. No futzing around with special chargers and balancers...

    [​IMG]
    #62
  3. Beater

    Beater The Bavarian Butcher

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    2.1 pounds?! Wow. You must tell us how it works ...
    #63
  4. DiabloADV

    DiabloADV Semi-Occasional

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    Two-year warranty, and the re-seller is an inmate here -- herrhelmet, over in vendors. Reports so far are all good. Placing the electronics right in the box is a brilliant move and, IMO, takes away a lot of the failure outcomes of these batteries.

    The main downside is that this battery is pretty much for starting and running the bike. You don't want to, say, charge your GPS overnight or inflate a big camping mat without the bike running.
    #64
  5. DiabloADV

    DiabloADV Semi-Occasional

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    Choices...The bottom pic is the way the bike is now, with upturned mufflers. But, I'm thinking they might look better flat, matching the line of the rear rack. They work better flatter, insofar as turn signals, etc. need to be set up. What thinks this band of experts...?


    [​IMG]
    Or
    [​IMG]
    #65
  6. DiabloADV

    DiabloADV Semi-Occasional

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    I could see the flat option with them about 4" lower...just below the top of the tire...would really show off the fender and still be well out of the way of rocks.
    #66
  7. DiabloADV

    DiabloADV Semi-Occasional

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    A little lower...
    [​IMG]
    #67
  8. Box'a'bits

    Box'a'bits In need of repair

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    Definitely prefer the turned up option.. :wink:, but are you going to take luggage? If so you need to think about how that will work. The turned up look shouts dirt bike. The lower says I'm just another old road bike
    #68
  9. DiabloADV

    DiabloADV Semi-Occasional

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    I'll be making oval side racks, to fit Wolfman bags. The mufflers can work either way, since the racks will be outside them.

    I need to keep staring at it. Right now, I like them upturned.
    #69
  10. Box'a'bits

    Box'a'bits In need of repair

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    I've got low on my GS and hate it. Buggers up ground clearance. Your lowest point isn't the sump. It's just in front of the rear wheel..
    #70
  11. Chico

    Chico Thief and Saboteur

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    From a purely aesthetic perspective, upturned is better. And if you can run it with only 1 can, I think it makes the bike tidier overall and is more consistent with the 70s (I think).
    #71
  12. DiabloADV

    DiabloADV Semi-Occasional

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    Will this bike run good with one 1-1/2" muffler or would I need to go to 2" (after the 2-into-1 merge pipe)?
    #72
  13. tdrrally

    tdrrally Long timer

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    i favor the dual hi my self

    but its your bike , so go with what makes you happy :D
    #73
  14. Houseoffubar

    Houseoffubar HoFmetalworks.com

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    Either position looks good to me, not much help I know:D

    A single 1 1/2 muffler will flow fine for up to around 150hp, so you should be OK for now:wink:
    #74
  15. chollo9

    chollo9 Screwed the Pooch

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    Angled looks better to me.
    #75
  16. isdt BMW

    isdt BMW willserv@aol.com

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    My 57 R-50 ISDT has a single R-51 muffler and works fine. only 250cc firing at any time. My R-75 ISDT has a 1-1/2" pipe into and out of the muffler, same deal, 375cc per cylinder. The 2 into 1 y pipe is a full foot forward of the muffler. BSA and Triumph twins used a single standard muffler with 2 into1 exhausts.
    #76
  17. tdrrally

    tdrrally Long timer

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    any pix of that r50?

    it might inspire some one :evil
    #77
  18. isdt BMW

    isdt BMW willserv@aol.com

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    There are pics here and also if you google R50-ISDT, it will show up. I do not have smugmug or any other hosting site, I will have to get one to post my R75-ISDT photos, I'm not computer savvy enough to do it myself, I'll have to ask my kids for help.
    #78
  19. limeymike

    limeymike Who Me?

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    The flatter position is the more practical, the angled position is for looks only. I prefer the flatter because I want a bike to work for what it is intended and don't care about looks all that much. I wouldn't want to work around an upswept exhaust with luggage as you won't see the exhaust anyway.
    #79
  20. isdt BMW

    isdt BMW willserv@aol.com

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    The high pipe bikes are for dirt/enduro/play, for touring I use a conversion /2 R90 with Hollendia sidecar rig, or R69US with Craven bags or my 78 R100S motorsport with Krauser bags. Everyone needs a BMW for each purpose.
    #80