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1977 BMW R100/7 Sarcoplasmic Cow Hellride.

This is a discussion on 1977 BMW R100/7 Sarcoplasmic Cow Hellride. within the Project Builds forums, part of the Caferacer.net Forums category; Good looking project irk_miller. I built an SL 350 for vintage racing and the stock fender on it was aluminum and looked good enough to ...

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Thread: 1977 BMW R100/7 Sarcoplasmic Cow Hellride.

  1. #61
    Member Norton 357's Avatar
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    Good looking project irk_miller.

    I built an SL 350 for vintage racing and the stock fender on it was aluminum and looked good enough to me that I left it on even for racing, and I had thought that one day I may make a street bike out of it.

    I always thought that fender would look good on a vintage bike

    Name:  fender.PNG
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Size:  1.59 MB

  2. #62
    Senior Member irk_miller's Avatar
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    Quote Originally Posted by Norton 357 View Post
    Good looking project irk_miller.

    I built an SL 350 for vintage racing and the stock fender on it was aluminum and looked good enough to me that I left it on even for racing, and I had thought that one day I may make a street bike out of it.

    I always thought that fender would look good on a vintage bike

    Name:  fender.PNG
Views: 138
Size:  1.59 MB
    That's actually perfect. I need to find one of those. I have one that I think might be SL350, but yours looks much longer. I don't think mine is alloy, and maybe has been cut down.

  3. #63
    Member Norton 357's Avatar
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    I think the frame and fenders I used were a 1973 model, not sure if other years used the alloy fenders

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  5. #64
    Senior Member irk_miller's Avatar
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    It was good to see that CL, because now I think I have a better shape with this fender (though it still may be a little long). Now it's step one towards the seat. I didn’t take pics of the foam base, but basically I cut and carved insulation foam, taped it up with masking tape, coated it in mold release, then laid no blush epoxy and fiberglass mat. I thicken the epoxy with System 3 fused silica, so I can lay it thick and so it holds on vertical surfaces. When the epoxy cures, I’ll trim the edges of the pan to the horizontal frame tubes, then sculpt a hard foam master shape for the cushion, make a mold, then cast the seat cushion. More on that when the foam and stuff arrives from Charlotte.

    Name:  seat_pan.JPG
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  6. #65
    Senior Member irk_miller's Avatar
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    Cured overnight, rough cut the sides (not the ends) with shears, removed the foam, and now I’m adding a few more layers of glass...

    Name:  seat_pan_02.JPG
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Size:  1.75 MB

  7. #66
    Senior Member XB33BSA's Avatar
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    nice work i bet the epoxy doesnt smell nearly as bad as polyester resin
    i am pretty sure i have a spare alloy rear fender from my sl stock
    i check tomorrow over at the storage
    the rear fender on there now def has to come forward it just looks wrong
    the rear tip should not be past very much at all ,what can we call it ?
    how about the spinline the rear tire vertline
    but mainly to look right it needs to be even gap around the tire when suspension is full bump
    if you always use that as a guideline they will look RIGHT
    BY THE WAY THAT REAR FENDER SECTION YOU HAVE ON THERE LOOKS CLOSE TO CZ MX
    https://www.google.com/search?q=CZ+R...w=1025&bih=632

  8. #67
    Senior Member irk_miller's Avatar
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    I think i got it fixed, for the most part. I should've known it wasn't quite right, when the top profiles of the two halves didn't match at all. I pulled the shock, dropped the rear end onto the wheel and lined everything up. The rear section was pretty far off, but much of that had to do with the angle of the hoop. It was way too steep. I ended up dropping the hoop a good 2 inches or so.

    Name:  fender_01.JPG
Views: 115
Size:  1.77 MB
    Name:  fender_03.JPG
Views: 117
Size:  1.89 MB

    On a side note: I got the headlight installed. It's huge, since on the original build I went with an aftermarket that was a close to stock as I could find. TBD if it's the right look for this version of the bike. I honestly prefer a bigger light. Seems a lot of builds nowadays want to go with the smallest lights that are mounted way back in the forks, and I'm not sure I like that look.

    Name:  fender_02.JPG
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Size:  1.84 MB

  9. #68
    Senior Member XB33BSA's Avatar
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    not feelin it,too long,to dumbo the elephant...

    needs to be like the vettr i have
    no tools and its short fr t bk
    nice big clocks and the bucket high enough to block bottom view of clock cans
    finish in rakishly garrish flyshadescreen,bubble, see



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    Last edited by XB33BSA; 12-01-2018 at 11:15 PM.

  10. #69
    Senior Member XB33BSA's Avatar
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    Quote Originally Posted by irk_miller View Post
    I think i got it fixed, for the most part. I should've known it wasn't quite right, when the top profiles of the two halves didn't match at all. I pulled the shock, dropped the rear end onto the wheel and lined everything up. The rear section was pretty far off, but much of that had to do with the angle of the hoop. It was way too steep. I ended up dropping the hoop a good 2 inches or so.

    Name:  fender_01.JPG
Views: 115
Size:  1.77 MB
    Name:  fender_03.JPG
Views: 117
Size:  1.89 MB

    On a side note: I got the headlight installed. It's huge, since on the original build I went with an aftermarket that was a close to stock as I could find. TBD if it's the right look for this version of the bike. I honestly prefer a bigger light. Seems a lot of builds nowadays want to go with the smallest lights that are mounted way back in the forks, and I'm not sure I like that look.

    Name:  fender_02.JPG
Views: 116
Size:  1.84 MB
    yes nayld it,the fender
    the fender and tail
    Last edited by XB33BSA; 12-01-2018 at 11:29 PM.

  11. #70
    Senior Member irk_miller's Avatar
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    Despite the lack of love for my 1935 Chevy truck headlight (I actually like it), it remains. I do want to try that more shallow Vetter. I tried a smaller than the Vetter 6v light with a similar shape that didn't look right at all once the gauges were loaded.

    Name:  IMG_2311.JPG
Views: 110
Size:  2.33 MB

    The seat pan is complete. I end up mounting all of my seats with a GSXR pillion seat latch. The front of the pan slides into the frame's backbone via machined delrin cup.

    Name:  IMG_2314.JPG
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Size:  2.03 MB
    CaTacL1sm and Norton 357 like this.

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