Eddie’s BMW R80 / Velorex 562 build
July 26, 2014 at 10:03 am #5859
Over to the brother in laws again today for some more work on the bike
Looking very naked
New higher and wider handlebars half fitted. It took much longer than expected as I had to re route a lot of cabling
Attachments:July 26, 2014 at 10:18 am #5860
Still to do: (this list may change as time progresses)
Get a new starter motor – (Arrived 25/05)
Get new Horn – (Arrived 25/05)
Get the right keys
Possibly get a new battery (done)
Get a new exhaust pipe (Not required now)
Wire brush & paint exhaust headers (Dependant on getting exhaust spanner)
Get exhaust spanner (Organised)
Build a subframe for the sidecar (in progress)
Attach sidecar to subframe
Build a wiring loom for sidecar lights
Get sidecar dialled in
Ride it!July 27, 2014 at 8:59 am #5861
More work on the bike today, I finished mounting the new handlebars and we lined up the bike and chair. My brother in law Roger has made most of the subframe, though it’s not fitted in the pics below. It’s really only the upper rear mount that needs sorting out now.
Attachments:July 28, 2014 at 8:54 am #5862
More pics, the front subframe being mocked up
and taking a leaf out of Coriman’s book, 10mm plate for the side
Attachments:August 4, 2014 at 8:57 am #5863
Front part of subframe fitted
Front upper mount closeup
Front lower mount
Looking down towards front mounts
Attachments:August 4, 2014 at 9:08 am #5864
Sub frame attached to center support
Frame for upper rear mount
Attachments:August 6, 2014 at 9:28 am #5871
So it turns out I have a custom top fork clamp, which means my headlight ears won’t fit as the custom clamp is significantly thicker than the stock one.
Coriman may be able to make a replacement, if my measurements are the same as his earlier twin shock top yoke.
Steering Stem – 27.51mm measured at the thread of the steering stem, Steering stem hole 33mm as the stem nut has a ridge that fits into the hole in the yoke that locates everything.
Fork staunchion thread -25.49mm measured at the thread at the top of the staunchion. My largest adjustable wrench wasn’t quite big enough to get the nut undone.
Attachments:August 10, 2014 at 6:33 am #5877
The original top clamp was this
TOP YOKE 1985 ON TWINS (NOT PARALEVERS)
BMW Part No. 31 42 1 452 135
The steering stem hole is 33mm, the staunchions are listed as 38mm and we measured the staunchions on my bike with a set of digital verniers as 38.5mm, with the hole being 38mm
The nut at the top of the fork is this. The total height of the nut is 12mm with 8mm of that being the hex section and 4mm being the inset section.
STANCHION NUT 40mm (FITS ON TOP OF SPRING RETAINER UNDER CAP 29003) 10/85 ON 2V TWINS.
BMW Part No. 31 42 1 454 959
Attachments:August 11, 2014 at 12:44 am #5879
Rank: 125cc Rider
There are still a few things to sort out with your fork yokes.
The stock plate top yoke is held by 3 points.
The steering stem nut spigot at 33mm with matching hole in yoke.
The fork stantiions should be larger than the corresponding holes in the top yoke, since the fork nuts draw the stauntion up to the the yoke but not through it.
They are located by the fork nut spigots, under the hex. What diameter are they? because that is what dictated the size of the hole in the yoke not the stauntion size. Unlike your aftermarket yoke.
Also the distance between centres is critical?
That’s fork stauntion centres and also centreline of fork tops offset to centreline of steering stem.
Also there are several holes for handlebar risers and instrument brackets etc. They all need to be identified and located by measurement from a datum . Diameter of hole need to be specified etc. in a working drawing.
The distance from fork top to centre of bottom yoke as well as wheel spindle to lower yoke centre. The reason for all this is that I cannot assume that your forks and yokes are the same as mine, as indeed they are not. I can see from your pictures that the bottom yoke is much heavier than mine, so it is possible tha they may have to be relieved at 3 degrees to accomodate the new fork angle. Its not quite as simple as a bolt on part, and not to be rushed into.
With your set up what wheel track rear wheel centre to sidecar wheel centre are you using? Also what sidecar wheel lead have you chosen?
These two things effect the steering effort required.August 11, 2014 at 5:45 am #5880
Think I’ll just have to get a stock clamp at the moment and try and ride it as is. I don’t have easy access to the bike to strip it all down and measure up in the next week or so to have a yoke made up before Cold Kiwi.August 16, 2014 at 11:11 pm #5881
Attachments:August 18, 2014 at 11:35 pm #5882
More work on the bike last night, the front end came out and gaiters, headlight ears and headlight shell, and a stock top plate were all installed. It’s starting to look like a bike now
Attachments:August 19, 2014 at 7:24 am #5883
A pile of random top plate measurements for Coriman
Attachments:August 19, 2014 at 7:26 am #5884
Attachments:August 19, 2014 at 7:27 am #5885
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