MONO/PARA weights

Discussion in 'Airheads' started by Phreaky Phil, Dec 25, 2012.

  1. Prutser

    Prutser Long timer

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    But I guess you are going to use it 2up ? Than the subframe should be stronger than mine.
    Must admit I think I weight it without the bashplate.
    My front wheel is a lot lighter than stock. ( am using a G650X wheel)

    The R100gs i had before was 185 stripped. So it must be possible.
    Didn't measure that my self !
    #21
  2. Kokopelli

    Kokopelli Yeah, right!

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    Now I know pretty much stuff all about these things, but I am pretty sure Manuel does. I've seen what he did to make his bike lighter.

    [​IMG]
    #22
  3. Phreaky Phil

    Phreaky Phil Long timer

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    Yes it would be a 2up bike.
    The subrame can be braced with one straight tube from the footpeg end to the rear, either welded or bolt on and coule incorporate the pannier frame rails. For the GS a R80 basic subframe would proably be the best start point.
    #23
  4. AntonLargiader

    AntonLargiader Long timer

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    FWIW I think my '88 is 44x pounds without fuel. That's about 40 pounds more than your cited weight. That's with a PC545 battery and no oil cooler. Still has crash bars, stock everything else including exhaust.

    What was stripped?
    #24
  5. Phreaky Phil

    Phreaky Phil Long timer

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    Hi Anton. 440 pounds is 200kg. Mine is a 92 so has the big fairing. I think it was 209 with a very small amount of gas. Staintune muffler, GS1150 battery. stock most other things. Extra couple of kilos with rear disc.
    #25
  6. Phreaky Phil

    Phreaky Phil Long timer

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    Ok, here is where I think some weight can be cut
    Fairing/ headlight/ instrument panel 7kg
    crash bars 1.5kg
    front wheel 4.5kg
    side stand 0.75kg
    muffler 3kg
    subframe 1kg
    centre stand 1kg
    swingarm/final drive 2kg
    forks/triple clamps 1kg
    front brake caliper 0.5kg

    Total 22.25kg

    That still puts the weight with no fuel around 187kg
    Not sure where another 12kg could be found. Hmmmm !
    #26
  7. Kokopelli

    Kokopelli Yeah, right!

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    You could try and lose some of the metal bits off the engine. Replace the front cover with carbon fibre. Maybe the same with the airbox and starter lid. Maybe there are lighter starters available. The indicators can be replaced with something lighter. It just starts to get a bit expensive and time consuming, after the obvious stuff. Take the tools out, they can go in the luggage. Fit lighter mirrors. I don't know if there is much of a difference in shock weights. Batteries are heavy as well, Handlebars, could be another one. I am sure some are lighter than others.
    #27
  8. Phreaky Phil

    Phreaky Phil Long timer

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    Yea could get tricky. I already have WR indicators which are pretty light and alloy bars. I took a mirror off, havent weighed it yet but it felt pretty light. I havent weighed the battery yet. I may be able to save a little yet on a smaller one. I dont think the Shorai batteries are quite up to the task yet. I have a Valeo starter, i read somewhere just recently that the Bosch starter is heavier and the Nippon Denso is lighter.
    #28
  9. Padmei

    Padmei enamoured

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    I don't think it needs to be necesarily that expensive . I have dropped as much crap off mine as I could & I'm as tight as a tight thing. Getting rid of the ridiculous BMW wiring, relays, lites, speedos etc is a great start. Got a real small motobatt. I dropped about 30kgs replacing the stock collector& muffler with phils cast off Y pipe & a Ti pipe:lol3
    I couldn't believe the difference in weight between my DRZ & GS wheels either - WOW.

    if I get another attck of motivation I would look at replace the subframe with something smaller but then you lose the luggage compatibility. I wonder if you could lighten the driveshaft without any detrimental effect.
    #29
  10. Kokopelli

    Kokopelli Yeah, right!

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    I wish I could do that, too, but Basil is just a little bit special, so I don't want take too much off. Maybe if I win the lotto I can send him to Edelweiss Motorsport for a bit of R&R, but really, I am happy with the way he is now.

    It will be interesting what Phil comes up with. I am glad he has rekindled his relationship with his airhead.
    #30
  11. motu

    motu Loose Pre Unit

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    My bike lost 4 kilos last month - it cost nothing and I feel much better for it.
    #31
  12. Prutser

    Prutser Long timer

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    Stripped was no crash bars, no cooler, G/S subframe shortened a lot, no speedo, G/S fuel tank, Self made seat very small, no tool box, he was using a battery that was able to start the bike once :baldy, lighter aluminum handle bars,
    light exhaust,no fairing, It was the first type of para GS lighter wiring loom. no bashplate,

    I really don't know if what he told me was the correct weight. But it was certainly not ready to go on a trip.
    I used it for a few years to play in the mud. But added some parts again, like a bigger battery, bigger seat.

    The ST felt a lot lighter from the start compared to the stripped R100GS.

    With all the effort you will put in, its going to be hard and expensive to get it almost as light as the DR650.

    The lower Fuel tank under the seat was one of the best things I did to the bike. Getting the weight as low as possible is the way to go IMO.
    The PC680 under the gearbox that I did on another bike makes a huge difference in handling.
    #32
  13. Kokopelli

    Kokopelli Yeah, right!

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    This is cracking me up. I had written that I could lose 4kg and would feel a lot better without it, then I deleted it, because I have a habit of rambling on.
    #33
  14. Beater

    Beater The Bavarian Butcher

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    Do these panniers make me look fat?
    #34
  15. mendoje

    mendoje Been here awhile

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    On my oilhead, I replaced my 15 lb bmw battery with a 2.2 lb Shorai LiFePO4! I live in Southern California though, I hear lithium batteries dont like colder weather.
    #35
  16. Phreaky Phil

    Phreaky Phil Long timer

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    Thats a huge saving but I have heard the same things as you have about the cold and also about recharging them if they go flat.
    #36
  17. Phreaky Phil

    Phreaky Phil Long timer

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    Yes, it would be an expensive and difficult exercise to get the weight lighter than 185kg
    My heart wants to build a lightweight trick bike from my GS but my head tells me that my DR is probably already a better bike, although its not without its faults.
    The low centre of gravity on the GS would probably make you feel that you are riding a lighter bike than it actually is and as you have shown in the Sibersky report, the GS has gone everywhere the lighter singles have.
    Hmmmmm !!
    #37
  18. Kokopelli

    Kokopelli Yeah, right!

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    I don't ride a GS because I think it's the ultimate adventure bike. It may have been once, but not anymore.

    I like the GS because of its boxer engine and its history. I think it's a pretty cool looking bike. It's comfortable over long distances, it's got nice low down torque and it's not highly strung. There is no depreciation and best of all, it doesn't mind me messing with it and still goes afterwards.

    I am not sure what you are trying to achieve, but your bike is already very good, for an airhead. You know about the law of diminishing returns.

    Using that battery is probably a very good idea. It's a huge weight saving for relatively little outlay. I think it's worth giving it a go. I probably will, once the current one is stuffed. If it makes it easier to pick up the bike, I am all for it. :D
    #38
  19. Phreaky Phil

    Phreaky Phil Long timer

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    The aim would be to build a bike that would go anywhere the DR could go with suspension good enough to do it at the same speed. A bike that could be ridden on any track or trail in NZ ( within reason ) and be comfortable on the hundreds of km's of gravel and tarmac to get there and back. A bike that would be capable of completing the TAT and any other expedition that we decide to venture on.
    Dawn and I were talking this arvo about this. if we were heading to the South Island to ride which bike would we take ?
    If we were just going to ride gravel roads then maybe the Beemer, but if we want to go exploring, then the DR.
    Thats why the Beemer's hardly been ridden since I built the DR.
    #39
  20. Kokopelli

    Kokopelli Yeah, right!

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    Since I've had those HH-Racetech inserts installed I am very happy with the front suspension. I am not sure what can be done about the rear. I guess my WP Shock has never seen a service and that could be a start, But really, that rear suspension is just a clunker. During that ride in Woodhill forest there was a fast section with lots of undulations. It was fun up to a point, while a DR would have just soaked them up ( I am guessing). I am quite happy to live with those limitation.

    I use my R1150GS as a long distance gravel tourer and the R80GS as my adventure bike. Horses for courses.The bike is part of the challenge. Maybe you need a well set up HP2 if you want to stick with BMWs, Otherwise a KTM 950 might do a better job.

    Having said all that, I hope you'll succeed, all lot of people will want to know how to do it.
    #40