Another R80 sidecar build

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This topic contains 21 replies, has 3 voices, and was last updated by  Box.a.Bits 7 months, 2 weeks ago.

Viewing 7 posts - 16 through 22 (of 22 total)
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  • #16905

    saltyseal
    Participant
    • Location: New Plymouth
    • Bike: 91 BMW R80S Mono
    • Rank: 80cc Rider

    Thanks B.a.B
    No problem with the chair getting light – I’d put 40Kg of water containers in the chair.
    VERY heavy steering and a low speed wobble caught me out a little though.
    Just finished taking off the fairing – just don’t really like the look of it. Wide bars ready to go on next weekend.
    Cheers

    #16906

    Box.a.Bits
    Participant
    • Location: Wellington
    • Bike: BMW Supertanker, R80 & Velorex Sidecar, Gilera Runner ST200
    • Rank: 1000cc Rider

    Sidecar wheel lead might contribute to the low speed wobble. Also tweaking the steering head bearing up a bit tighter than you’d normally run on a solo may help a bit.

    Mine runs straight & doesn’t wobble at all, so it is possible to tune it out.

    You can use the drive & brakes to drive around the heavy steering. However even with less trail, mine still beats me up going over the Rimutaka (though I don’t go slow).

    #17078

    saltyseal
    Participant
    • Location: New Plymouth
    • Bike: 91 BMW R80S Mono
    • Rank: 80cc Rider

    Wider bars fitted and the headlamp fairing removed – looking better.
    Reduced the toe-in from around 60mm to 20mm, and what a difference.
    I must have mis-measured the first time, because I was sure I had it at around 20mm originally. Lean-out is good, and the unit tracks straight and true. Still very heavy steering, and a little heavier left than right. I guess a little more adjustment of the toe-in to around 15mm will take care of that.
    Must improve the brakes next.

    “She Who Shall be Obeyed” is loving it in the chair, so it’s all good.

    #17111

    Eddieb
    Keymaster
    • Location: Hamilton
    • Bike: Suzuki DR650 ADV
    • Rank: 1200cc Rider

    It looks good. @stephen-clark, how hard would it be for an engineer replicate your upper fork clamp?

    #17121

    Box.a.Bits
    Participant
    • Location: Wellington
    • Bike: BMW Supertanker, R80 & Velorex Sidecar, Gilera Runner ST200
    • Rank: 1000cc Rider

    Anything can be replicated. The dimensions are in the original build.

    Whilst those triples prove the concept, & I am totally confident in them, it would be better to get Ken Howe or another engineer to make up the triple plate & ease the bottom clamp to the appropriate rake.

    Any discussion of ‘easing’ (bending) cast ali triples to fit a different rake could cause issues come compliance time.

    #17124

    Eddieb
    Keymaster
    • Location: Hamilton
    • Bike: Suzuki DR650 ADV
    • Rank: 1200cc Rider

    I would have thought filling the existing clamps and re boring them at the appropriate angle might have been better than bending?

    #17126

    Box.a.Bits
    Participant
    • Location: Wellington
    • Bike: BMW Supertanker, R80 & Velorex Sidecar, Gilera Runner ST200
    • Rank: 1000cc Rider

    Triples can be heated & bent to accomodate. It is really a question of knowing the appropriate temp to heat them to & what the cooling process should be in order to not lose temper. The change in rake is only 3 degrees, so not a heap in the scheme of things. Ken is able to do this.

    He has straightened bent triples using the same process.

    He has fitted a set of K100 forks to Jakes old Depnr & will rake those out 5 degrees to replicate the Ural triples.

Viewing 7 posts - 16 through 22 (of 22 total)

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