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Thread: Maybe I found a project

  1. #1
    Aspiring Profligate Jeff488's Avatar
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    Maybe I found a project

    It's a '79 R100RT. I have only seen photos of it.
    Looks pretty complete except that apparently someone dropped it and broke the fairing, and made it a naked bike. It's not a conversion I'd be proud of but I wouldn't mind a naked bike if it looked OK.
    46K miles. Has been stored inside for the last ten years.
    Seat looks good, considering the age.
    So, the question is:
    What red flags should I be aware of with the '79 year?
    I have owned and worked on an '83 R100RT, so airheads are not a complete unknown to me.
    I see that the M/C is under the tank and the choke lever is on the side of the engine.
    Other than that it looks pretty familiar.

    Any guidance is appreciated.
    '04 Silver R1150RT "Big Oel"
    '75 Red R75/6 (In bits and pieces for the moment.)
    '08 Suzuki DL650 "Screaming Yellow Zonker"
    Looking for Ed Sanders' Truck Stop.

  2. #2
    Registered User dmftoy1's Avatar
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    Check the shelf below transmission to see if it's leaking oil from rear main or input shaft seal. . . If it smells like sulfur its input shaft seal.

    Probably worth pulling tank and looking for rust under Master cylinder

    Pull valve covers and see how many threads are left in adjusters

  3. #3
    Aspiring Profligate Jeff488's Avatar
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    OK, thanks. I'll be sure to do that.
    With 46k miles and the hope that the PO didn't run the stink out of it, the valve seats will hopefully be OK. If not, that will just that much more $ in the bike.
    What is the deal with rust under the M/C?
    Do they tend to rust there a lot?
    I can see where if the m/c is shot it could be a bit spendy.

    I reckon replacing the input seal wouldn't be a big deal as the tranny needs to come out for a spline lube and to check the clutch.
    Rear main is a bigger deal, I would agree.

    The push rod tube seals are most likely needing replacement, but I've been there.
    Not to mention the fork rebuild.

    Sounds like fun.
    '04 Silver R1150RT "Big Oel"
    '75 Red R75/6 (In bits and pieces for the moment.)
    '08 Suzuki DL650 "Screaming Yellow Zonker"
    Looking for Ed Sanders' Truck Stop.

  4. #4
    Registered User
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    Any brake fluid that misses the mouth of the m/c and dribbles down the housing will end up on the frame. It will slowly eat the paint, then rust follows. Being out of site and mind, the corrosion develops at it's own pace. It's frustrating when you pull the tank and see the paint wrinkled around the m/c.

  5. #5
    Aspiring Profligate Jeff488's Avatar
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    Oh yes, of course.
    That out of sight thing will get one in trouble often.

    Thanks
    '04 Silver R1150RT "Big Oel"
    '75 Red R75/6 (In bits and pieces for the moment.)
    '08 Suzuki DL650 "Screaming Yellow Zonker"
    Looking for Ed Sanders' Truck Stop.

  6. #6
    JohnWC
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    Quote Originally Posted by Jeff488 View Post

    Any guidance is appreciated.
    Set aside a spare $3000. That ought to cover it.

  7. #7
    Aspiring Profligate Jeff488's Avatar
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    Quote Originally Posted by jconway607 View Post
    Set aside a spare $3000. That ought to cover it.
    Oh snap!
    I thought you were going to supply the needed parts.
    '04 Silver R1150RT "Big Oel"
    '75 Red R75/6 (In bits and pieces for the moment.)
    '08 Suzuki DL650 "Screaming Yellow Zonker"
    Looking for Ed Sanders' Truck Stop.

  8. #8
    JohnWC
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    Quote Originally Posted by Jeff488 View Post
    Oh snap!
    I thought you were going to supply the needed parts.
    I would, but I got cleaned out when I dropped $3000 on my last airhead restoration. Sorry.

  9. #9
    Aspiring Profligate Jeff488's Avatar
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    This will more a rescue than a restoration,
    so I'm hoping to spend a lot less than $3000.

    It's an RT with no fairing so the plan is to make it a naked bike. Or something.
    It isn't my first one, so the surprises shouldn't hurt too much.
    '04 Silver R1150RT "Big Oel"
    '75 Red R75/6 (In bits and pieces for the moment.)
    '08 Suzuki DL650 "Screaming Yellow Zonker"
    Looking for Ed Sanders' Truck Stop.

  10. #10
    JohnWC
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    Quote Originally Posted by Jeff488 View Post
    This will more a rescue than a restoration,
    so I'm hoping to spend a lot less than $3000.

    It's an RT with no fairing so the plan is to make it a naked bike. Or something.
    It isn't my first one, so the surprises shouldn't hurt too much.
    Airheads are wonderful bikes. I'd be the first to say so. I loved my R60/7. If I had kept it I probably wouldn't have gone through several other BMW bikes and Japanese scooters by now. It sounds like your project is much more manageable than the one I got into. I hope it works out for you. Good luck with it.

  11. #11
    Registered User 80092's Avatar
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    Leakdown Test

    + 1 on what others said . Hope you can perform a leakdown test on the motor. It will let you know the condition of the head and top end. Then there is FD crown wheel splines . You could quickly dump 3 K into it as others said. Remember it has not run in 10 + years , no test ride ?
    What is the asking price ?
    Peter Murray
    Stroudsburg, Pa.
    IBA 359
    2014 RTW, 73 R75/5

  12. #12
    Aspiring Profligate Jeff488's Avatar
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    Quote Originally Posted by 80092 View Post
    + 1 on what others said . Hope you can perform a leakdown test on the motor. It will let you know the condition of the head and top end. Then there is FD crown wheel splines . You could quickly dump 3 K into it as others said. Remember it has not run in 10 + years , no test ride ?
    What is the asking price ?
    I haven't laid hands on it yet, which may or may not happen this week(next week I'm riding in the Appalachians).
    I will at a minimum, ensure the engine turns freely with at least some compression. Ring replacement is easy, as is head work, but much more expensive!
    Also pull the rocker covers to see how much adjustment is left.
    Check tank for rust.
    Check wheel splines.

    I am a bit concerned about being able to find a headlight bucket and bracket. Don't have any experience there.
    I believe the ignition switch goes there on the 100R, along with an indicator light of some sort.

    I'm hoping to get it for under $1000, depending on condition issues mentioned above.
    Have not seriously talked price yet, and won't till inspection.
    We shall see----
    '04 Silver R1150RT "Big Oel"
    '75 Red R75/6 (In bits and pieces for the moment.)
    '08 Suzuki DL650 "Screaming Yellow Zonker"
    Looking for Ed Sanders' Truck Stop.

  13. #13
    Aspiring Profligate Jeff488's Avatar
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    Well, the owner has decided to keep the bike, saying they are getting more valuable.

    I guess the search is back on.
    '04 Silver R1150RT "Big Oel"
    '75 Red R75/6 (In bits and pieces for the moment.)
    '08 Suzuki DL650 "Screaming Yellow Zonker"
    Looking for Ed Sanders' Truck Stop.

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