#4 - R90S Powered /2 Conversion Period Hot-Rod

Discussion in 'Airheads' started by Solo Lobo, Jun 17, 2020.

  1. black knight

    black knight Long timer Supporter

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    WHAT diode did you use and which direction was it placed ?

    link the link you learned from for the rest of us .
  2. Solo Lobo

    Solo Lobo airhead or nothing Supporter

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    I added the diode number to the earlier post, but they are 1N4001's that I got off of Amazon in a large assortment for something like $10. The ones I bought had to have the grey ring on the side closest to the bulb socket.

    I did check the orientation by holding the diodes in place using alligator clips and testing the flashers to make sure it would work.

    https://advrider.com/f/threads/5-turn-signal-indicator-light-and-leds.1521264/
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  3. bmwrench

    bmwrench Long timer Supporter

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    When I encounter a leak like the one you've posted, I coat the flywheel bolts with Hylomar, and make a THIN ring of Hylomar where center hole contacts the crank. Be very sparing there; metal to metal contact is (mostly) what keeps the flywheel in place. I'd also put some in the fly wheel where it fits over the indexing pins.
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  4. Pokie

    Pokie Just plain Pokie.

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    Often I find that a rear main leak isn't a rear main leak at all. Rather, it will be an oil pump o-ring leak. Putting sealant on the flywheel mount is a good idea as oil can and will find a way through.
  5. Solo Lobo

    Solo Lobo airhead or nothing Supporter

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    Just worked a deal for the speedo on the left...

    [​IMG]
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  6. Plaka

    Plaka Brevis illi vita est

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    I sealed the tubes through my Briel with PC7 on the inside just for insurance. Snowbum of course rave about how they blow up and throw oil on the rear tire. I've used the thing on two bikes so far with no issues. But it's a PITA to install and doesn't help cooling. I tested it with the holes opn and plugged and my instruments showed no change. The extra oil has no value, just adds weight. Running the oil lower in the case may have some value, but I prefer more ground clearance. I use it.
  7. Solo Lobo

    Solo Lobo airhead or nothing Supporter

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    There’s been Briel on my R65LS for something like 100k miles now.

    mostly I think they look period and interesting
  8. Solo Lobo

    Solo Lobo airhead or nothing Supporter

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    Parts arrive, now I just need to find the time.

    The 3.5" rear tire looks out of scale from the rear end... should have started with the 4" tire I guess

    [​IMG]
  9. bmwrench

    bmwrench Long timer Supporter

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    Yeah, I'd probably send that back.
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  10. Solo Lobo

    Solo Lobo airhead or nothing Supporter

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  11. Jim K in PA

    Jim K in PA Long timer Supporter

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    Yes. It's an R90S.
  12. Solo Lobo

    Solo Lobo airhead or nothing Supporter

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    Well, if there is a company that takes back tires with 220 miles one them… LOL
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  13. Jim K in PA

    Jim K in PA Long timer Supporter

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    :D Have you seen the returns area at your local Harbor Freight? :hmmmmm
  14. nmalozzi

    nmalozzi airheaded

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    or REI
  15. Pokie

    Pokie Just plain Pokie.

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    If it's a /2 frame and wheels, 3.50 x 18 is the correct size. You can fit a 4.00 but that's not what the wheels were designed for. That said, a 4.00 x 18 on the rear looks just about right. A /2 frame was designed to take a 3.50 x 18 on the rear and a 3.25 x 18 on the front.
    Beils likes this.
  16. Beils

    Beils Been here awhile

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    Chalk it up to Tuition! Paid for knowledge…
  17. Solo Lobo

    Solo Lobo airhead or nothing Supporter

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    One of my least favorite motorcycle tasks is changing tires, but for some reason I continue to do it myself. My excuse this time is that I bought the Mark Parnes balancer about a year ago and I was thinking I learned a few things that would help when I mounted the /2 tires.

    As I noted before, originally I went with a 3.5" front and back, but the 3.5x18 rear looked really small compared to the 3.5x19 out front.

    So, the removal and installation were smoother this time, but getting the bead seated was an absolute PITA that took me almost two hours and many, may attempts

    [​IMG]

    The rear fender isn't fully mounted so looks a bit askew here

    [​IMG]

    Here's the replacement speedometer. I am going to check multiple speeds on the current one (as it reads low) to see if I can determine what ratio it goes to as either is isn't a 1:2 as labeled or my final drive while labeled to match with a 1:2 contains different internals than it is marked. I'll probably send the new (old) one down to wirespokes this winter for a service

    [​IMG]
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  18. Solo Lobo

    Solo Lobo airhead or nothing Supporter

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    Installed the Dyna booster at lunch today.... also realized that the speedo cable wasn't fully seated in the transmission. I wonder if that could have caused the speedo error I was seeing? Bet it could, need to test.

    [​IMG]
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  19. tennessee thumper

    tennessee thumper Long timer Supporter

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    Curious how the new rear tire looks, pop up a pic next time.
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  20. bmwrench

    bmwrench Long timer Supporter

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    That really is nice paint.
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