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Thread: 1973 R75/5 Back-to-road Project

  1. #61
    Rally Rat 1074's Avatar
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    Springs

    You could also go for the BMW sport springs with part number ending in 017. They are actually shorter than the stock springs, making them easier to install. They're made out of a heavier gauge wire. The soft springs probably have a dab of yellow paint on the end. The sport springs have white paint.
    I've had a sort of problem with the Progressive springs in that they tend to bind. Also, they come with spacers that are not really needed and make them a bear to install.
    Boxerbruce

  2. #62
    Quote Originally Posted by 1074 View Post
    You could also go for the BMW sport springs with part number ending in 017. They are actually shorter than the stock springs, making them easier to install. They're made out of a heavier gauge wire. The soft springs probably have a dab of yellow paint on the end. The sport springs have white paint.
    I've had a sort of problem with the Progressive springs in that they tend to bind. Also, they come with spacers that are not really needed and make them a bear to install.
    Thanks, I'll keep that in mind for when I get there!
    Olaf - Austin, TX MOA #200565
    Current bikes: 2012 R1200R Classic, 1973 R75/5 www.R75slash5.com, 1969 CT 70 (108 cc engine)

  3. #63

    Right carb leaking oil....yes oil.

    Yes oil, not gas. It definitely is engine oil and I assume it comes through the breather hose which is stuck in the right carb.

    I noticed a few drops of oil on my boot after a 30 mls "spirited" test ride (most of the time around 65 mph or a bit faster). First I thought I overfilled my engine oil but oil level is spot on, about 10% under max.

    Is this normal? My Harley with the Evolution engine did it sometimes out of the airfilter, but only after hard rides.
    Olaf - Austin, TX MOA #200565
    Current bikes: 2012 R1200R Classic, 1973 R75/5 www.R75slash5.com, 1969 CT 70 (108 cc engine)

  4. #64
    Registered User ebeeby's Avatar
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    Can be normal. You want to make sure the breather spout is so positioned that it does not touch the air flow tube in order to reduce the tendency for the oil vapor to condense rather than be drawn into the intake as vapor.
    1973 R75/5

  5. #65
    Registered User cwroady's Avatar
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    Quote Originally Posted by 1074 View Post
    ... probably have a dab of yellow paint on the end. The sport springs have white paint..
    Just rebuilt my forks also and couldnt find reference (that I know I have found before) on if painted end of spring was top or bottom? My recollection was that the painted end goes on top so that is how I installed them. Can anyone confirm this? Thanks.
    Chris - 2015 BMW RT / 1972 BMW R60/5 / 2007 KTM300xcw / SCBMWRC
    There ain't nothing like a friend who can tell you're just pissin' in the wind.
    Neil Young

  6. #66
    Liaison 20774's Avatar
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    The part of the spring with the tighter windings needs to be put at the top. Theoretically, that reduces the unsprung weight which consists of the wheel, brakes, and the lower part of the spring. But the weight difference is virtually unnoticed, so the key would be just to be consistent in the spring orientation.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  7. #67
    Quote Originally Posted by ebeeby View Post
    Can be normal. You want to make sure the breather spout is so positioned that it does not touch the air flow tube in order to reduce the tendency for the oil vapor to condense rather than be drawn into the intake as vapor.
    Good advice thanks, need to double check, since I had the air filter housing out for cleaning.
    Olaf - Austin, TX MOA #200565
    Current bikes: 2012 R1200R Classic, 1973 R75/5 www.R75slash5.com, 1969 CT 70 (108 cc engine)

  8. #68

    Back to the dreaded stud....

    Quote Originally Posted by James.A View Post
    There is a tool shown on page 20 of the September 2017 Airmail. hpd_online.com/stud_tool.asp High Precision Devices Inc,Boulder Colorado USA .
    While I have been able to put 200 mls on my bike, the noise on the right cylinder has become louder, so I took off the valve cover to take a look. Rocker arm end play on the exhaust side was huge and as expected the upper right head bolt was lose (not totally but 10-15 ft.lbs max).

    I took the rocker arm off, double nutted the stud and turned it in a bit further than the other ones in hopes of grabbing a thread down there but no success. At around 18 ft.lbs I started pulling out the stud.

    I did a lot of reading over the last days, and I am leaning towards buying the tool from HPD as suggested by James (and others I have talked to). Yes, it's expensive, but I called HPD and I like that they are using an insert (which is supposedly better than a helicoil) and they also include the guide to drill the oil passage.

    Now my question is, can you tell from my engine number (4000410) whether my engine has the 99 mm or 97 mm bore? Right now they offer the tool only for the 99 mm, but they can fabricate an adapter ring. The more I think about it it, the more I want to do it myself...Thanks!
    Olaf - Austin, TX MOA #200565
    Current bikes: 2012 R1200R Classic, 1973 R75/5 www.R75slash5.com, 1969 CT 70 (108 cc engine)

  9. #69
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    Quote Originally Posted by anotherbmw View Post
    ...Now my question is, can you tell from my engine number (4000410) whether my engine has the 99 mm or 97 mm bore? Right now they offer the tool only for the 99 mm, but they can fabricate an adapter ring. The more I think about it it, the more I want to do it myself...Thanks!
    I'm sure someone will come along and tell you definitively, but if I remember what I read correctly, the bore size changed in 1976?
    Last edited by sprouty115; 10-20-2017 at 05:58 PM.

  10. #70
    Liaison 20774's Avatar
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    You VIN is a January 1973 build and is way before the spigot sized changed (should be the '76 /6 models) so your size is 97mm.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  11. #71
    Quote Originally Posted by 20774 View Post
    You VIN is a January 1973 build and is way before the spigot sized changed (should be the '76 /6 models) so your size is 97mm.
    Thanks!
    Olaf - Austin, TX MOA #200565
    Current bikes: 2012 R1200R Classic, 1973 R75/5 www.R75slash5.com, 1969 CT 70 (108 cc engine)

  12. #72
    Airmarshal-IL James.A's Avatar
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    Hey guys, maybe we might create a registry of members who own airhead special tools, who might be willing to participate in sort of lend/lease program. I, for one, am wiling to loan these sort of things to members. Something to consider.
    1973 R75/5

  13. #73
    Quote Originally Posted by James.A View Post
    Hey guys, maybe we might create a registry of members who own airhead special tools, who might be willing to participate in sort of lend/lease program. I, for one, am wiling to loan these sort of things to members. Something to consider.
    Love the idea!
    Olaf - Austin, TX MOA #200565
    Current bikes: 2012 R1200R Classic, 1973 R75/5 www.R75slash5.com, 1969 CT 70 (108 cc engine)

  14. #74
    dharmawheeler
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    Quote Originally Posted by kentuvman View Post
    Congrats Olaf - nice ride - I used POR to recondition tank on my airhead.

    You'll more like than likely Ned to buy carb kits from Bing - have you sought out the local airheads club in TX? A great way to learn how to repair, tune and gain appreciation for this wonderful air cooled bike.

    Pretty!
    I restored the exact same bike but yours looks very clean! One thing I like is that the original rear shocks are on it and not rusty! It is hard to find OEM parts for that.
    Have fun! That Guppie tank is rare. Plus it is the first year that BMW did the extended drive shaft mod and you can see the weld seams. Very cool!



    Sent from my iPhone using Tapatalk

  15. #75
    Thanks 101820, I also really liked the fact that the bike is mostly original, will try to keep it that way!
    Olaf - Austin, TX MOA #200565
    Current bikes: 2012 R1200R Classic, 1973 R75/5 www.R75slash5.com, 1969 CT 70 (108 cc engine)

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