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Rannsachair
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No, its modified,someone has shortened the rod, normally they are symmetrical with no grinding.
Morrisman
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No I found it on one of my Face book groups and thought it was interesting.
I also used several beemers, ex-police R80RT's, in the 1980's for despatch riding. The huge fairings made them genuinely dangerous on a bridge or flyover, if there was much crosswind.. it was more like sailing a small boat on a rough sea, wrestling with the handlebars bars to keep in lane
Riding up the west side of Paris, in the flat lands last year, horrendous cross winds. I was passing big trucks and the drop in wind, and the sudden resurgence after I’d passed was terrifying, sending me across the whole lane I was in...and there was only two lanes.
Never been that scared on a bike before.
I only have a standard screen too, no fairing. The year before my magnetic tank bag was blown off the bike, on the other side of the country heading south, landing in the ‘fast’ lane of the dual carriageway. I pulled over pretty sharpish and managed to run back and grab it before it got destroyed by traffic. It held my iPad, wallet, passport, phone etc... no damage done, just a few corners worn off and the zip was rooted.
jerrytug
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@Morrisman The box heads call them the 'gummikuh' which means 'the rubber cow'
8ob
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This is where I am with this , cant think of another reason to cutnshut a conrod. Its a forging at the end of the day so it should weld without compromising the integrity of the rod.
Bob
Rannsachair
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I was told that by a German I worked with at Triumph Hinckley back in 1990 when my transport was a R100RS, they also called CX500's die Gullepumpe or sewage pump.@Morrisman The box heads call them the 'gummikuh' which means 'the rubber cow'
octo0072000
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Thanks, though do fancy getting an R100RS again too....
i know of one in a shed not moved for at least 10 years
think it's a RT though green fairing with standard bars
won't part with it well will but wants stupid money for it
he also has that cruiser BM made as well
slim_boy_fat
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octo0072000
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Back in the 70's an American chap used to bore and stroke the Honda XL350 to 500cc using the standard conrod by heating the middle and compressing it in a press. It looked odd but he never had a failure.
i remember reed titan i think did the cb72 and
cb77 305cc to 350 conversions
I have a r100rt,
And a r80rt but I removed the fairing of that,
I also have a r80 G/s
I've been looking for an airhead motor to 'warm up' and make reliable a Russian/Chinese sidecar outfit if I can find a reasonably priced non running rig here in Portugal- the bureaucracy makes it impossible to just stick a chair on any old bike.
But the prices of airhead bits have rocketed in the last few years. Oilheads everywhere cheap as chips, but airheads not at all. Was going to be my big project for this year!
But the prices of airhead bits have rocketed in the last few years. Oilheads everywhere cheap as chips, but airheads not at all. Was going to be my big project for this year!
It's not often I disagree with what you type @80b, but in this instance I do - the weld will undergo cyclic compression and tension stresses, as well as any side load if the guy hasn't got it "cock on". Maybe for shows, pootling around on idle jets it might survive, but I wouldn't bet a penny on it surviving the full throttle treatment for long.
I like seeing a welded repair, but this is a bit beyond imho.
Does it have to be a BMW motor? Other aircooled flat twins are available.... e.g. Panhard 850, 60 BHP.
Screwdriver
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oh, I don’t know, modern conrod is a pretty robust item. Not often you hear of them failing when you consider how many of them are out there day in day out. So I guess they must have a pretty high factor of safety regarding their durability.
A weld might not have the grain structure of a forging but it has a lot of strength in a strong part and especially in tension and compression, you’re not going to pull it apart. In this application there is no bending moment, no twist and no shear forces to contend with. I can see why this otherwise questionable modification might work.
jerrytug
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I had a Ural, before they got trendy, and it had a better gear-change than the BMW 2-valves! Half the power though..
Crude as hell, but straightforward.
You could imagine some poor Red Army rider forcing it through the snowdrifts during the defence of Stalingrad..
You need a replica machine-gun on the sidecar, now that would maintain 'social distancing'
How to put this diplomatically?! For the authorities here it would just need to look like a Ural/Dnepr etc.
Surely those lovely little Panhards are collector's pieces now too?
