DRZ Forks and HPN Tank on a R100 GS PD

Discussion in 'Airheads' started by Daithi, Jan 2, 2012.

  1. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

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    hah hah hah...you wish
    #21
  2. Beater

    Beater The Bavarian Butcher

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    A Wonderfully Glorious and Huge Dream!!!

    squashed

    :lol3
    #22
  3. Daithi

    Daithi Destination Unknown.

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    Are you gents saying this won't work ? :scratch

    I've put the drive on without bolting up and it looks ok, I can't see how the idea won't work, even
    the wheel alignment seems reasonably good ?
    #23
  4. Beater

    Beater The Bavarian Butcher

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    I have no idea weather it will work or not ... personally, I'm rooting for you. If it does, then my '91 GS will be getting one of those when the shaft dies.

    Are you replacing the swingarm as well? Are you just replacing the final drive assembly?
    #24
  5. Daithi

    Daithi Destination Unknown.

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    You had me scared there, I thought you knew something
    I didn't. The drive is from a K1 and pairs perfectly with the
    original shaft. I'll put the inside cover from an 1100R final
    drive to allow me to use whe twin pot caliper. I'm relieved
    there's nothing you're aware of that would stop this from
    working. This should be a bolt up job with no machining
    apart from making up a shim for alignment purposes.
    #25
  6. Beater

    Beater The Bavarian Butcher

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    Very interesting. Besides maybe the parts being available ... what are your reasons for doing this? Is there some sort of design benefit? The R1100's are not supposed to have the shaft problems of the R100's. Is this the reason? if this is the case, why not replace the swingarm as well? Does the shaft mate differently with the transmission?

    More pictures!!!

    Carry on!
    #26
  7. Airhead Wrangler

    Airhead Wrangler Long timer

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    The R1100 swingarm and driveshaft are longer. Also, the trans side of the shaft fits on a spline rather than a bolted output flange like on airheads. In order to use an 1100 swingarm on an airhead, you need one of the trans output adapters. Also, you need to create a new shockmount as the oilhead swingarms use a single center mounted shock.

    [​IMG]
    #27
  8. hardwaregrrl

    hardwaregrrl ignore list

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    Just the age old Mono vs Para debate....keep moving, nothing to see!! But certainly looking forward to your progress!! Thanks for sharing!
    #28
  9. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

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    No I wasn't saying it couldn't be done. I think it has been done, what I was talking about was the drive shaft issues. That won't be taken care off.
    #29
  10. Box'a'bits

    Box'a'bits In need of repair

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    I don't think this is being done for shaft longevity reasons. Daithi is following Phreaky Phil's lead in putting a rear disc on R100GS(ex-PD). He is using the KI final drive because that is the same generation as the R100GS paralever, & more particularly has the mounts to allow this.
    #30
  11. Daithi

    Daithi Destination Unknown.

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    That's exactly it Box'a'bits, the little difference it the K1 final drive inner cover will be swapped out for the 1100R cover allowing me to use the 4pot
    brake system I have hanging on a nail in the garage.

    The only component I was waiting on arrived this morning, replacements for the Pivot Bearings I don't seem to get much time from the bearings
    (too many potholes I suppose) so I'm gonna give the Pivot Bushings a go.
    [​IMG]


    There are another few mods I'd like to make such as the FD vent routed higher, the steering lock is terrible so I'd like to have a go at milling a new
    set of fork yokes with a 30mm offset and I presume using a GPS istead of a speedometer is probably illegal so I'll have to sort that too.

    My DRZ1000 [​IMG]
    Daithi.:D
    #31
  12. Stagehand

    Stagehand Imperfectionist

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    Cool project for the swingarm length, but I dont see the advantage of a rear disc, personally.
    #32
  13. Daithi

    Daithi Destination Unknown.

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    If I'd changed the inside cover for an 1100GS cover I'd have had to change the shims, being lazy I've taken the easier option.
    I didn't have access to a lathe so I took a grinder to the caliper mount.
    [​IMG]

    This is the way it's looking now, I need to offset the rim next.
    [​IMG]

    I've used the bushings instead of bearings for the pivots and phased the driveshaft.

    Won't be long now. :D
    #33
  14. Phreaky Phil

    Phreaky Phil Long timer

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    I've not seen any good reports with those bushes. Several failures documented on ADV rider a year or two back.
    #34
  15. Daithi

    Daithi Destination Unknown.

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    Hi Phil, a lot of what I'm doing is your fault.:D

    The logic behind using the bushings makes sense, the individual pins in the needle bearings just wear out too quickly for some reason. I'll give them a go, I've used the recommended procedure, type of Loctite and grease.:1drink
    If it fails I'll be shouting from the roof tops about it.:huh

    Phil, can I ask why you went with the R100 rim instead of the R1100 rim when you were getting the dish/offset done ? :ear
    #35
  16. Phreaky Phil

    Phreaky Phil Long timer

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    My fault eh :evil I thought the bushes would be a good idea to, but after I saw failures I went off the idea.
    As for the rim size, to get the rim centers line up a 20mm offset is required, this can't be done with the wider 1100 rim as it would hit the swingarm.
    Cheers Phil
    #36
  17. Prutser

    Prutser Long timer

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    Are you going to use the 100 GS 17" rim or go for an 18" R100R front rim or police R1100RT front one.
    It helps to raise the back a bit to match the fork length and a lot more choice of off road tires.

    A friend of mine did it with his R100gs and the bike handles perfect.
    #37
  18. Daithi

    Daithi Destination Unknown.

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    Now, that's interesting Prutser !
    I'd planned on using the 1100GS rear rim but as Phil pointed out, the R100GS rear rim would suit better, d'ya not think the front rim would be way too narrow ? Any chance of a photo.

    My Solution was gonna be turn a new set of front wheel spacers to offset the front (drz400) wheel 10 mm to the left (currently the spacers are both 30mm long, I'd make one 40mm and the other 20) in addition to this I would dish/offset the rear rim 10mm to the right giving me the 20mm. Because I'd only need 10mm dish might allow me to use the existing spokes on the R100 or it might even allow me to keep the 1100 rim.
    #38
  19. Prutser

    Prutser Long timer

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    The rims are 2.50"x18 that should fit tires like 140/80.
    Some people even mount those rims on the back of their R1100gs.

    (will try to get a pic)
    #39
  20. Daithi

    Daithi Destination Unknown.

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    Found these, I think the owner, Stephen Bottcher is on here too:

    [​IMG]
    [​IMG]

    Tyre doesn't look too narrow at all, trying to track a rim down within budget will be a challenge but I do already have a hub waiting for it. Thanks Prutser.[​IMG]
    #40