Or maybe it's because you're in the Southern Hemisphere and the Coriolanus force (the thing that makes the water swirl in the bathtub drain) is in the opposite direction.....
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Trip odometer let go
- Thread starter Michaelo
- Start date
Michaelo
650Mick
Taken from wiki...
Draining in bathtubs and toilets
Contrary to popular misconception, water rotation in home bathrooms under normal circumstances is not related to the Coriolis effect or to the rotation of the Earth, and no consistent difference in rotation direction between toilet drainage in the Northern and Southern Hemispheres can be observed.The formation of a vortex over the plug hole may be explained by the conservation of angular momentum: The radius of rotation decreases as water approaches the plug hole, so the rate of rotation increases, for the same reason that an ice skater's rate of spin increases as they pull their arms in. Any rotation around the plug hole that is initially present accelerates as water moves inward.
Of course, the Coriolis force does still impact the direction of the flow of water, but only minutely. Only if the water is so still that the effective rotation rate of the Earth is faster than that of the water relative to its container, and if externally applied torques (such as might be caused by flow over an uneven bottom surface) are small enough, the Coriolis effect may indeed determine the direction of the vortex. Without such careful preparation, the Coriolis effect is likely to be much smaller than various other influences on drain direction[46] such as any residual rotation of the waterand the geometry of the container. Despite this, the idea that toilets and bathtubs drain differently in the Northern and Southern Hemispheres has been popularized by several television programs and films, including Escape Plan, Wedding Crashers, The Simpsons episode "Bart vs. Australia", Pole to Pole,[49][50] and The X-Files episode "Die Hand Die Verletzt". Several science broadcasts and publications, including at least one college-level physics textbook, have also stated this.
Draining in bathtubs and toilets
Contrary to popular misconception, water rotation in home bathrooms under normal circumstances is not related to the Coriolis effect or to the rotation of the Earth, and no consistent difference in rotation direction between toilet drainage in the Northern and Southern Hemispheres can be observed.The formation of a vortex over the plug hole may be explained by the conservation of angular momentum: The radius of rotation decreases as water approaches the plug hole, so the rate of rotation increases, for the same reason that an ice skater's rate of spin increases as they pull their arms in. Any rotation around the plug hole that is initially present accelerates as water moves inward.
Of course, the Coriolis force does still impact the direction of the flow of water, but only minutely. Only if the water is so still that the effective rotation rate of the Earth is faster than that of the water relative to its container, and if externally applied torques (such as might be caused by flow over an uneven bottom surface) are small enough, the Coriolis effect may indeed determine the direction of the vortex. Without such careful preparation, the Coriolis effect is likely to be much smaller than various other influences on drain direction[46] such as any residual rotation of the waterand the geometry of the container. Despite this, the idea that toilets and bathtubs drain differently in the Northern and Southern Hemispheres has been popularized by several television programs and films, including Escape Plan, Wedding Crashers, The Simpsons episode "Bart vs. Australia", Pole to Pole,[49][50] and The X-Files episode "Die Hand Die Verletzt". Several science broadcasts and publications, including at least one college-level physics textbook, have also stated this.
Yer poppin' my bubble kangaroo-boy!
Don't believe everything you see in Wikipedia.....
Don't believe everything you see in Wikipedia.....
Michaelo
650Mick
I love wiki, I suppose all your water has turned to ice by now....
Shall we experiment then, I am at 20°17'S 148°40'E
Shall we experiment then, I am at 20°17'S 148°40'E
Sure - ready for ya anytime!
txxs
XS650 Addict
Michaelo,
Thanks for your post.
I was not referring to your US import.
I was merely saying that the photo on the top left of Skull's post is not of a XS650 speedo.
This site allows free discussion so I understand that I am able to say this.
Of course you can say this...................You input is appreciated, your early model experience is invaluable.
. Your right about the KPH and MPH. Been doing some research and cross referencing with my 74/75 gauge sets/parts. RD250/350 and TX/XS500's had the same gauge bracket. Some difference in the Brake Lining Warning Light named different on RD's and different again on TX/XS 500.
Have a set of gauges KPH 220 and red line 7.5. The housing is the same as in the pics i posted.
Seems there may have been a gauge housing change from 74 to 75. ........................More research going on before i post more pics. I may not have been, as up the shit as i thought. No more said till........................
. Your right about the KPH and MPH. Been doing some research and cross referencing with my 74/75 gauge sets/parts. RD250/350 and TX/XS500's had the same gauge bracket. Some difference in the Brake Lining Warning Light named different on RD's and different again on TX/XS 500.
Have a set of gauges KPH 220 and red line 7.5. The housing is the same as in the pics i posted.
Seems there may have been a gauge housing change from 74 to 75. ........................More research going on before i post more pics. I may not have been, as up the shit as i thought. No more said till........................
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txxs
XS650 Addict
The local road signs started to change from miles to kilometres in 1974.
All the 74 model bikes and cars were mandated to have metric speedos etc.
All the 74 model bikes and cars were mandated to have metric speedos etc.
Not sure when that happened here in Canada - maybe a bit later in the 70s. It caused a bit of havoc for older people and for US visitors. In fact, I think they're still confused because some Go much too slowly and others much too fast. Oh well,
Yes, a little later in Canada. My 1976 XS500C, which I bought new, came with MPH on the speedo. My 1978 XS650SE has KPH on the speedo. So, maybe 1977 or 1978 was the first year, in Canada, to switch over to metric.
Yup, my '76 650 is in MPH but my now sold '79 Suzuki GS850G was in KPH.
Hi Pete,
here's a hard datum to add to your confusion:-
My main bathroom toilet flushes in a clockwise swirl. My main bathroom washbasin drains anti-clockwise.
And judging from the current weather conditions Saskatoon is definitely NOT on the equator.
&IIRC, Canada went Metric in 1977 "Which is when these 40cm kitchen cabinets go on those 16" centred studs."
Hi Skull,
hopefully this helps but perhaps it adds to the confusion instead.
Micks photo of his self-detaching trip indicator shows it at the top of the gauge face, just like the speedo/tach set in your photo.
All the trip indicators on my small collection of US & Canadian Yamaha speedos are at the bottom of the gauge face.
And those gauges are all bi-numeric.
The US speedos have an outer ring of big white MPH numbers and an inner ring of smaller orange KPH numbers and the odometers are in miles.
The Canadian speedos are reversed from this, outer white ring reads KPH, the inner orange ring reads MPH and the odometers are in KM.
Perhaps your gauges are from before 1977 when Canada went metric and there was no need for bi-numeric speedos?
Perhaps the odometer inversion was also from those times although I do have a DT360 speedo from that era, grey faced, MPH only and it's trip is at the bottom too.
.
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Been through RD250/350, TX500/750 tons of XS650B and TX650A Gauge clusters..............
Start with the speedo because that is where the change is.
70-73 Have the Speedometer above the trip-meter and the trip nob enters through the case side attached to the trip meter shaft.
74/75 has a completely new Cluster and bracket............I have found 2 different sets of gauges, 74TXA Same bracket, different Dial face, Speedo unit, housing and cups
74TXA Speedo face has the Speedometer above the trip-meter. ....................Same as 70-73.
Trip nob moved to the back of the gauge. Trip Nob at 10'clock position at the bottom of the cup.
Pics in Post #8 are from a 74 Speedo, (Speedometer above the Trip-meter), and in Post #9 a close up of the Speedo unit.............Take note of the 2 sets of cogs to get from the knob to activate the reset
75B Speedo. Post #7 Shows the Dial/Face with Speedometer below the Trip-meter. Post #15; NOTE; shows by swapping the trip-meter and speedometer on the Dial/Face the trip reset knob only needed one set of cogs to activate the reset. The unit was a bit different and the housing changed.
74 Speedo housing. Post #16............75 Speedo Housing Post #13.
In 76, (through to 84), a new Bracket and gauge cluster................ Speedo Unit Post #3............They molded plastic Housings and Swapped back the Speedometer to above the trip-meter on the Dial/Face. Trip-meter knob moved back to pre 74 position, to side of housing in line with the Trip-meter shaft.........................Direct drive
So conclusion.............74 and 75 were both a stand alone set of gauges that interchanged
Start with the speedo because that is where the change is.
70-73 Have the Speedometer above the trip-meter and the trip nob enters through the case side attached to the trip meter shaft.
74/75 has a completely new Cluster and bracket............I have found 2 different sets of gauges, 74TXA Same bracket, different Dial face, Speedo unit, housing and cups
74TXA Speedo face has the Speedometer above the trip-meter. ....................Same as 70-73.
Trip nob moved to the back of the gauge. Trip Nob at 10'clock position at the bottom of the cup.
Pics in Post #8 are from a 74 Speedo, (Speedometer above the Trip-meter), and in Post #9 a close up of the Speedo unit.............Take note of the 2 sets of cogs to get from the knob to activate the reset
75B Speedo. Post #7 Shows the Dial/Face with Speedometer below the Trip-meter. Post #15; NOTE; shows by swapping the trip-meter and speedometer on the Dial/Face the trip reset knob only needed one set of cogs to activate the reset. The unit was a bit different and the housing changed.
74 Speedo housing. Post #16............75 Speedo Housing Post #13.
In 76, (through to 84), a new Bracket and gauge cluster................ Speedo Unit Post #3............They molded plastic Housings and Swapped back the Speedometer to above the trip-meter on the Dial/Face. Trip-meter knob moved back to pre 74 position, to side of housing in line with the Trip-meter shaft.........................Direct drive
So conclusion.............74 and 75 were both a stand alone set of gauges that interchanged
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Hi Skull,
thanks for the in-depth speedo study.
It only leaves the philosophical question:-
WhyTF do some XS650 design features seem to be set in stone while others were altered every time the wind changed?
thanks for the in-depth speedo study.
It only leaves the philosophical question:-
WhyTF do some XS650 design features seem to be set in stone while others were altered every time the wind changed?
Based on my experience in the auto industry, (and at the risk sparking a firestorm of attacks from more knowledgeable people on the forum) I suspect that the XS650 was not the focus of a great deal of development work by Mama Yama after the initial Hosk 500 >> XS1 design effort (except when driven by the marketplace (stiffer frame, electric start, disc brake, electronic ignition, "Special" styling, etc). The engine / transmission / electrical system assembly itself got virtually no real improvement - because it worked well, it was what that market segment seemed to want, (and the tooling was all paid for 
).
The stuff that DID change on the 650 from time to time and market to market (items like instruments, paint, brakes, tires, etc.) were mainly supplier items and not parts of the bike that were actually produced by the OEM. For example, the Nippon-Seiki instruments: likely, N-S gave them a deal on a particular run of instruments in a given year and so that's what wound up on the bikes for a given market (and of course, that depended also on the metric / miles requirements as well). Yamaha would need to secure an adequate supply for that market (including crash parts and service spares) and their buyers would have to joust with those of Honda, Suzuki and Kawasaki, and sometimes there are even familial relations (the Ford & the Firestones intermarried for example) and other personally-based purchasing criteria.
Anyhow, there is a lot more behind purchasing decisions than meets the eye - and there is nearly always a reason for what may seem like a totally random decision - but those reasons are nearly always invisible to the consumer (except of course Ford's historic switch away from Firestone tires after the Explorer tire fiasco).
). The stuff that DID change on the 650 from time to time and market to market (items like instruments, paint, brakes, tires, etc.) were mainly supplier items and not parts of the bike that were actually produced by the OEM. For example, the Nippon-Seiki instruments: likely, N-S gave them a deal on a particular run of instruments in a given year and so that's what wound up on the bikes for a given market (and of course, that depended also on the metric / miles requirements as well). Yamaha would need to secure an adequate supply for that market (including crash parts and service spares) and their buyers would have to joust with those of Honda, Suzuki and Kawasaki, and sometimes there are even familial relations (the Ford & the Firestones intermarried for example) and other personally-based purchasing criteria.
Anyhow, there is a lot more behind purchasing decisions than meets the eye - and there is nearly always a reason for what may seem like a totally random decision - but those reasons are nearly always invisible to the consumer (except of course Ford's historic switch away from Firestone tires after the Explorer tire fiasco).
Michaelo
650Mick
Skull you really went all out to get the information on the gauges, where do you hide all that?
The only issue with the trippy meter I have is the missing bush.....it must have broken up and I never saw any remanding bits in the can...
The only issue with the trippy meter I have is the missing bush.....it must have broken up and I never saw any remanding bits in the can...
Michaelo
650Mick
Well it's crapped out again, gggary has a second hand one in the mail to me now so replacement was the option as opposed to my dodgy repair....thanks Gaz
Good for Mick and thank goodness for the parts collectors among the community.
Cheers all,
Pete
Cheers all,
Pete
