Ontic's 1981 R80G/S build-up thread

Discussion in 'Airheads' started by ontic, May 24, 2011.

  1. Rucksta

    Rucksta SS Blowhard

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    You need a Seibenrock 1000cc power up kit :D
    #81
  2. ontic

    ontic

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    LOL.
    Thanks, I think. Are you still running the 1000cc kit? I've been reading a bunch of threads about these power up kits and have noted your strong advocacy, and have also come across your posts leading you towards the 1070cc kit.
    I definitely don't want the 1070cc kit (?yet:lol3) but the 1000cc one sounds right up my alley and although expensive, isn't completely ridiculous.
    Was it really as plug and play as it sounds? Any carby adjustments?
    How has longevity been and how much more life do you expect?
    With the higher compression have you had any pinging with poor fuel? (I just searched and see you are twin plugged, did you do this before or after the power-up kit?)

    There is a strong likelihood that I will be riding this bike at least a small way round the world, up into SE Asia to start with and then who knows where after that (depends on a lot of undermined factors right now). Thus, I am a little concerned about raising the compression for the poorer fuels I might encounter.

    A bit more power would be really nice at times, especially when loaded down and/or two-up- essentially though I want maximum torque and midrange, whatever efficiency I can get, and reasonable reliability. A decent compromise is of course OK.
    Any real potential after 6000rpm is mostly wasted on me, especially if it is costing me between 2500-4000rpm.
    #82
  3. Lornce

    Lornce Lost In Place

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    If you want to do a rtw trip I wouldn't recommend a 1000cc top end. Won't harm longevity, but it'll undermine the fuel range. Range is a bigger issue for travel than power, imho.

    An R80 has more than enough power to negotiate anything you're likely to encounter travelling the world.
    #83
  4. ontic

    ontic

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    I totally agree with this and really the 1000cc kit would be more of a want than anything needed. However a lot of this trip might be two-up with luggage, and even though I think the R80 would do fine, particularly through the slower roads in the developing world where I will spend most of my time, it would no doubt feel a lot nicer with that bit extra. I don't mind riding a heavy bike, but I am not overly excited about riding a heavy sluggish bike.
    Range? I'd like to hear how greatly the 1000cc kit affects fuel efficiency. Range per se I am not particularly worried about as I've got 45 liters fuel capacity in my Sauer tank, and anything where more would be expected will just have me temporarily strapping on extra plastic fuel bottles.
    As I understood it the siebenrock 1000cc kit is a bit more efficient at converting fuel to power- which if that extra power is used enough would translate to a higher fuel use per KM, but I would not always be using the extra power.
    For my use I'd be hoping for a reasonable and probably variable (10-20%) increase in fuel consumption, but if I am being unrealistic I am open for education.
    Cheers,
    #84
  5. Solo Lobo

    Solo Lobo airhead or nothing

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    Grant and Susan were fine with 800cc's

    [​IMG]
    #85
  6. ontic

    ontic

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    Riding two-up with everything including those jug panniers, don't tell me that bike didn't wish for hyperdrive on occasion
    (makes Wookie sound)
    [​IMG]

    But seriously, no doubt it is very true and I need to be talked out of this.
    We'll see.
    #86
  7. Sibbo

    Sibbo Been here awhile

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    Consider yourself talked out of it :D.Reliability, torque and light weight are my considerations .2 up you will probably be more worried about staying vertical on shitful roads than going fast and an R80 has a fair bit up it's sleeve if you use the revs .
    #87
  8. Lornce

    Lornce Lost In Place

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    R80G/S-PD I picked up in BC this summer fairly amazed how well it accelerated. Fully loaded 5th gear passing was a breeze. Those short gears certainly work to provide readily available torque. :nod

    I couldn't abide needlessly spinning a liter motor like that.

    :nah

    Besides, 60-80km/hr cruise speeds is all you really need to shoot for in most of the world.

    :ricky
    #88
  9. Rucksta

    Rucksta SS Blowhard

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    Ontic

    I went for 1000cc kit '77 S heads with a few mods, 9.5:1 pistons and Del Orto carbs in one hit.
    Dual plugs came a few years along with valve seats and a mod to the squish band to adress pinging with the intoduction of unleaded fuel.

    I have about 350,000 km on the bores and pistons with one ring replacement a couple sets of valve guides plus a set of guides when I did the valve seats.

    Bottom end is still in good shape as are the cam and rockers.

    Gear box has been trouble free.
    I seem to have stopped wearing out universal joints.
    I seem to be hard on the final drive but it does cop a bigger pounding since I went to USD forks 5 or 6 years ago.

    I put 100,000km on the stock motor.
    I did gearbox & final drive bearings as well as valve guides in the 100,000 as well as a couple of drive shafts.

    With the stock motor I was always ringing it neck and got poor fuel ecomomy.
    With the 1000kit I can get the response and performance I want with a turn of the wrist.

    Motor will run on 91, E10 or Opal.
    It runs fastest on 95.
    I use 98 makes me feel better about running hot slugging it through the trees.

    I average around 15- 17km /lt and have achieved 22-24km/lt running good dirt road in top gear at 80kph.

    Stock motor would deliver in the 15-17 km/lt range never seeing better but sometimes returning 12.5 with the lowest ever 10.3 on a fang thru the hills.


    I'm due for a new set of barrels (have been for the last 35,000ks)
    I am still interested in a 1070 kit mainly for the mid range.

    When I think back to what a blast this bike was when the 1000 motor was fresh and what it does now I'm thinking a fresh set of barrels, pistons & rings with a valve grind and new guides would give me back everything it had that impressed me as a 28 year old rev head.

    If I went 1070 I'd need more brake and suspension upgrades as well as a higher 5th gear and posibly exhaust replacement with 38 or 40mm to get the best out of it.

    The cost of the kit and associated upgrades is a bit scary .
    For the same money I could have a very nice second hand enduro, a husky TE610 or a new SX85 for the budding MX rider in the family so I'll probably just go for another 1000 kit.


    The Seibenrock power up kit with the standard heads and 32mm bings is reported to be a torque monster.
    #89
  10. Airhead Wrangler

    Airhead Wrangler Long timer

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    A buddy of mine gets consistently better gas mileage on a GSPD with a 9.5:1 1000cc engine. The taller final drive and higher compression make quite a difference.
    #90
  11. Lornce

    Lornce Lost In Place

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    Gears and compression are the road to efficiency, for sure.

    When stock with low factory compression my 1000cc GSPD got anywhere from 13-16km/liter. With 1050cc pistons, modded '77 S heads running higher compression (12:1 estimated and making much more power and torque) it netted 20km/liter pretty consistently.

    Don't know how it'd run on Nepal's gas, though.

    :augie

    I've been riding airheads since '83 and know them fairly well. If I left today for a round the world adventure... I'd take my KLR.

    :D
    #91
  12. igormortis

    igormortis Cafe Reise

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    Hmm, don’t have a KLR. I’ll have to take the airhead. Damn. :D
    #92
  13. Box'a'bits

    Box'a'bits In need of repair

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    Fixed :D
    #93
  14. Sibbo

    Sibbo Been here awhile

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    Hmm ... I'm running an '83 R80 ST ... a taller top gear sounds very interesting !
    #94
  15. ontic

    ontic

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    Awesome post Rucksta and worth quoting in full so I can read it a few more times on this page, thanks for all the details.
    Costs for 1070 kit are indeed scary. I need to be in a whole nother pay bracket before I could contemplate that.

    torque monster sounds pretty nice to me, and even though the kit is lighter etc, I am reassured that it would give me plenty of use for the cost.
    Pinging on poor fuel and/or the need for twin plugging has me most concerned.
    Time to do a bit more research into that.


    Yep, I'll skip the KLR too. To start being so practical and utilitarian right about now in my life would seem like a hell of a waste of time and effort these last dozen years or so:lol3

    Indeed,
    motobins do the gear for your bike for £99 (and for my bike for £128)
    which is one of the other things I've been chewing over and would be the way I would want to go with a power-up kit (power up kit with taller 5th and the G/S final drive sounds like a good combo)... which then just adds to the cost, and also means I'd be opening the gearbox... which means that I should probably consider some other upgrades, the improved shift kit thing that started (according to Anton) mid 1981 (my bike was Feb 1981)- and yes this gearbox does hit false neutrals- and also the metal K-roller things...

    Anyway I am going to have to chew on all this for a while and see if I can justify the costs. I am by no means writing it off.

    By the way Sibbo, how's Tilly going? Did you get those pesky twin plugged heads to work properly or are your just about ready to offload them?:evil
    #95
  16. Sibbo

    Sibbo Been here awhile

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    She's doing just fine mate ! The hard starting thing has been solved ...as you know she's twin plugged and the coils ( old Jap ones ) were set up in parallel, which is the norm as I understand it .Anyway in desperation I took her into the local bike shop and their bloke changed it to series, something I hadn't thought of. She starts first touch now :clap.Happy me .. it was bloody boring before , lots of very gentle handling to get her to go, once started she was fine but the starting was a nightmare !:cry I never knew if I was going for a ride until she lit up .

    All done and sorted .

    Gearboxes ? Mine is good , no false neutrals ,quick and positive .The PO was a mechanic and had her for quite a while and made a few major repairs . She's sweet ! I reckon gearboxes are a bit like Pandora's Box ... don't open unless really necessary .
    #96
  17. ontic

    ontic

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    Great to hear Tilly is running well.
    The big boat is now all painted, tarted up and tidied. Engine starts and runs OK (thanks for adamantly pointing me to timing issues). Photos are all taken, gear and extras are all organized and photographed. Now I need to create a new online album for the photos and write up my ebay description... wish me luck. I'll send you the links when I'm done.

    About pandoras box- against some good advice and some of my own beter judgment I will soon be prying at the hinges and seeing if I can pop at least a couple of these boxes right open:D
    I got my motobins order done. Between all the G/S stuff and a couple of things the 90/6 needs, the final bill was.... significant.:eek1:cry
    I'll leave the details as a pleasant surprise for when it all arrives. At the moment I am trying to get over the separation anxiety I am suffering from dropping that pile of cash. I won't be buying myself a christmas present this year, that's for sure.
    At least most of the serious spending is now done. Before the motobins order the last significant things weren't too bad because I spread them out more, forks, wheel, ohlins rear, tank, custom triple, etc, etc... they didn't really hurt like this one did.

    Once all the new parts arrive from the UK, and my front end stuff arrives from the US, then I will have plenty to do and keep me occupied in the shed over summer.
    I'll be slowly putting aside a bit of money for Paul Rooney and my frame and swing arm- which will get dealt with once I have completely sorted out the front end and the subframe and pannier frame.
    I've got a friend who also wants a set of alloy panniers (who is currently welding aluminium for his living) so we will probably set about making a couple of pannier pairs together.

    Electrical (charging system, possibly ignition) upgrades is something I don't want to think of yet and will leave until much later.

    Anyway, not much to update other than all this. Work is busy, and I need to work as much as I can to refill the bank account.

    Note to self: do not even think about doing this kind of thing to another bike. Once is enough:deal
    #97
  18. bgoodsoil

    bgoodsoil Dare to be Stupid

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    +1. Also, after doing all this nonsense--never ever sell it.

    Loving this thread :lurk
    #98
  19. Sibbo

    Sibbo Been here awhile

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    G'day mate .... I'm glad the boat is right ,one less thing to worry about ! I'm starting to get worried about this g/s of yours , all the gold plating will look funny with mud on it !:D

    Just in case you haven't worked out a system to hang your panniers I'll show mine off ! (again !:norton)It's kind of my idea with huge bits stolen from all over the place .As you know they are a couple of Thermite cases , ex US army . $80 each from a disposal store ...yeah ,I know I've told you but they are good, light and waterproof .

    [​IMG]

    Not to everyone taste of course butthe mounting system works well .They are dead easy and quick to mount and dismount .The black material is 12mm HDPE from my local plastics shop .$30 for the lot plus a pile of useful scrap from their bin ...I couldn't resist ! Bolts are 6mm stainless 304 and nylocs .8mm ply on the inside of the cases .

    [​IMG]

    The top black tab (the narrow one ) and the long one at the bottom drop in and over the frame .The white things are steel ,about 6x40 mm if I remember ) Fairly solid , heavier than needed really but it was the size flat I had there .They pivot around to release or lock the onto the bar then pull inside the case with a HDPE handscrew on a 12mm thread.I t works very well and taps easily .There is a dome nut sitting inside to lock things if the cases are going to stay on for a long ride .It takes about 60 seconds to drop them off , the same to mount them .

    [​IMG]

    The rack is 12mm mild cos I like welding steel and don't have nice new 21st century welding tech like you :D. Mild probably adds a kg or so but is very easy to work with and repair if I break it . It was a bit of a bugger to fit but it's solid .

    [​IMG]
    #99
  20. ontic

    ontic

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    Thanks, I hope the thread will have a bit more substance soon,
    And yeah, this one for sure I never plan on selling. I've ummed an ahhed about selling off the 90/6 if I end up going for an extended ride OS (along with selling off most of my other worldly possessions), but every time I think I have come to the mental space where I might be able to sell it... I fall in love with it again. But, the reality is, depending on what the plan is, when the time comes the 90/6 may have to go.


    Thanks mate, yeah it is going to be a load off my mind when that thing finally sells... something around a 2-3 ton load:D I can't wait.

    Don't get too worried about the G/S. Gold plating or not, it'll get covered in mud and used just like it should be, you've seen what I put my 90/6 through? Tough love is my approach:rofl
    [​IMG]

    Thanks for posting up your pannier and mounting system.
    I do really like those boxes. How many liters are they again?
    Your mounting system is great. I'm not sure which way I'll go with that, but quick dismountable is what I am after too- however I'd like to be able to dismount them (and lock them on) without emptying or opening the panniers.

    What I am hoping for the panniers I will make up is for them to be a really good custom fit this bike and its intended use. I'll be using the panniers in combination with a expandable soft luggage on the rear luggage rack ('horseshoe style' cheap giant loop clone:shog), and a new-to-me (second hand, cheap ebay) Held modular tank bag (fits my big tank really well). The panniers are not going to be huge, I don't want the bike to feel like a wide-load tractor. I haven't exactly figured out the volume and the dimensions, but am thinking possibly around 70 liters combined (smaller pannier on the left, larger on right), with cutouts/angles on the lower front edge (to reduce foot/ankle damage) and cutouts/angles on the lower outside edge, and quite possibly a couple of features that make them multi use, ie, lids as tables, etc. Not quite sure on the dimensions, but in general I'll probably be aiming for a little narrower and taller than is usually done. First things first is to fit the G/SPD single seat I ordered, then make the rear luggage rack, then play around with some pannier mock-ups to see how it all fits together.
    I like the pannier, rear bag and single seat combo as I use it on the 90/6. It is nice to have around 20-30 liters of quick easy expandability to grab supplies and quickly stuff them in.
    Heavy, hard and camping stuff in the panniers, and softer and lighter stuff in the bag is my approach.

    After buying this welder, I feel like I have to try make these things now:D
    My pannier frames are nothing exotic, just modified stock ones, mild steel too, but pipe instead of solid. Should be reasonably repairable by just about anyone anywhere by with welding skills, and I suspect they will need to be repairable as they are pretty lightweight (and bendable). We'll think of them as crumple zones for now:lol3:lol3