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I have a number of things to do to Tethys - install water pump, install new shocks front and back, and install rear crash bars. I'm thinking the best order is the way I listed them:
1. Water pump (part of which involves unfastening the rear shocks
2. Rear shocks
3. rear crash bars
4. reattach plastics

front shock can be done at any point.

Do I really need to lower the engine to replace the water pump?
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KimPossible wrote:
Do I really need to lower the engine to replace the water pump?
Yes - but as you're removing the rear shocks anyway, not a problem.
Remove exhaust, exhaust carrier, RH rear shock, wheel, LH rear shock.
Take care to ensure any wires won't get stretched.
The bike stays put on the centre-stand - but you can lift up the rear of the body by hand, and the engine will tilt down, pivoting on the centre-stand. It'll move enough that you can easily get to the water pump. Rest the rear brake disc (rotor) on some wood.

I found ordering the pump from SIP in Germany was not only cheaper (no taxes) but far faster delivery (two days!) than from any US supplier, including shipping. European suppliers tend to have a far lower mark-up than US ones.
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UTC quote
Is your maintenance up to date? With the engine lowered it would be a good time to check the valves and replace the plug if it is needed.
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When you put the scooter on the central stand, place some blocks of wood under the stand. Then you will be able to lower the engine a few inches further.
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KimPossible wrote:
I have a number of things to do to Tethys - install water pump, install new shocks front and back, and install rear crash bars. I'm thinking the best order is the way I listed them:
1. Water pump (part of which involves unfastening the rear shocks
2. Rear shocks
3. rear crash bars
4. reattach plastics

front shock can be done at any point.

Do I really need to lower the engine to replace the water pump?
I will be looking for your front shock replacement story when you get around to it. It might be easy on the bigger scooters but man was that a tough gig for me on the 50! I kept thinking, What is the trick to make this easier! lol
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I use a couple of aluminium tubes to align the top of the shocks. With the engine dropped I first attach the bottom of the shocks, then I insert the tubes through the holes under the saddle, and over the screwed threads at the top of the shocks. Then lift the engine and everything is in place ready for the bushes, nuts, etc. Don't need three hands!
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Abner_Bjorn wrote:
Is your maintenance up to date? With the engine lowered it would be a good time to check the valves and replace the plug if it is needed.
Valves! Baby steps, baby steps.
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Kevin T wrote:
I will be looking for your front shock replacement story when you get around to it. It might be easy on the bigger scooters but man was that a tough gig for me on the 50! I kept thinking, What is the trick to make this easier! lol
12 point thin walled sockets, long wobble extension. magic.
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Mike Holland wrote:
I use a couple of aluminum tubes to align the top of the shocks. With the engine dropped I first attach the bottom of the shocks, then I insert the tubes through the holes under the saddle, and over the screwed threads at the top of the shocks. Then lift the engine and everything is in place ready for the bushes, nuts, etc. Don't need three hands!
deep well sockets work well to align the tops, a 10 & 11 will do right and you're not currently using them!
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jimc wrote:
Remove exhaust, exhaust carrier
Wait, just re-read this. What is the exhaust carrier?
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KimPossible wrote:
Valves! Baby steps, baby steps.
you've come this far. why not a little further? you're right here, on the tettering precipice of mechanic-dom.

a set of valve feeler gauges is but a drop in the bucket tool wise.

and literally, if you've got the motor down to do shocks, check the valves and do a spark plug.

just remember to pull the evap off of the manifold before canting the motor up, and then remember to reattach it when done.

good luck!
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KimPossible wrote:
Wait, just re-read this. What is the exhaust carrier?
swingarm. that big chunky aluminum thing.
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greasy125 wrote:
swingarm. that big chunky aluminum thing.
I call it the swingarm plate.
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But it isn't a swingarm! I don't know why everyone here calls it that - an MV thing that's grown over the years (I confess I have on occasion)? It's fixed rigidly to the engine/transmission. No swing in it whatsoever.
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*runs over to jim with a good dark beer*
*smooths feathers*

shhh... shhh... I know man. I know.
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Ok, swingarm - I know what that is. Even if it isn't really.
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KimPossible wrote:
Ok, swingarm - I know what that is. Even if it isn't really.


The problem with calling it the wrong thing is that there *is* a very real swingarm on our scooters. It's called that by Piaggio, and it's in the parts diagrams. It's underneath where you can't easily see it, and it's the strangely jointed affair that connects the engine to the frame. And lets the engine SWING up and down. Razz emoticon

I know, I know, pedantry perhaps, but a potential source of confusion.

Thanks for the beer and feather-smoothing Greasy.
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jimc wrote:
But it isn't a swingarm!
It may not be the swingarm, but it is the swingarm plate. Because, lacking a better term, that one describes it to the point that people generally understand what is being conveyed. Also, because I say so.
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I'll allow you "exhaust bracket" or "suspension arm" - but this is the swing-arm, at least according to Piaggio:

(OK, this is MV so you can make your own definitions of course. )
Forum member supplied image with no explanatory text
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jimc wrote:
I'll allow you "exhaust bracket" or "suspension arm" - but this is the swing-arm, at least according to Piaggio:

(OK, this is MV so you can make your own definitions of course. )
That's the swingarm arm. The unit construction of the engine, transmission, and rear axle is, as I understand the term, the swingarm.
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jess wrote:
That's the swingarm arm. The unit construction of the engine, transmission, and rear axle is, as I understand the term, the swingarm.
As a logical extrapolation from conventional motorcycle parlance - yes, OK.

So confusion shall continue to lurk in the shadows.
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wait. wait. did jim just concede a point? or begrudgely agree?

*marks calendar*
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jimc wrote:
So confusion shall continue to lurk in the shadows.
I wouldn't be at all surprised if the parts diagram was a questionable translation from Vulgar Latin.
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jess wrote:
I wouldn't be at all surprised if the parts diagram was a questionable translation from Vulgar Latin.
I have no argument with *that*. There are loads of very competent linguists who do commercial translations - unfortunately almost all of them have zero technical background. Engineers who are fluent in two or more languages are few and far between (but there are some on this forum) and they almost never get asked to do the paperwork translations.

Anyway - Back to the Projects!

Check the rear brake pads while you've got them fully in view.
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I've just woken up, drinking my morning cuppa, and I would like to that you guys for brightening up the start of my day. Love MV!
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The mounting and movement of the engine/rear wheel on the modern vespa means that it does not really have a "swing arm" in the traditional sense.

Traditionally the mount point is the pivot point, but on the modern vespa the mount point is allowed to move up and down (by the swinging arm). This means that the engine can pivot about its center of mass instead of around the mount point. E.G. when you hit a bump the wheel and back of the engine moves up while the front of the engine moves down. It is not an "arm" that "swings" about any fixed point. It's a really clever design that reduces the impact of the huge unsprung mass of the engine, and gives a much smoother ride.

My vote would be not to use the phrase "swing arm" at all. I try not to, but don't normally make a fuss when others do.
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oopsclunkthud wrote:
My vote would be not to use the phrase "swing arm" at all. I try not to, but don't normally make a fuss when others do.
That’s fair, but then you have to come up with a better name for the various pieces.

You know, terminology that ignores the fact that it more or less resembles an arm that, well, swings.
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greasy125 wrote:
*runs over to jim with a good dark beer*
*smooths feathers*

shhh... shhh... I know man. I know.
jimc wrote:
Thanks for the beer and feather-smoothing Greasy.
Is that all it takes to soothe a raptor?!

.
.
jess wrote:
because I say so.
hardly ever get to hear that one anymore

.
.

ROFL emoticon
Thanks for the entertainment, fellas
ROFL emoticon
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jess wrote:
That’s fair, but then you have to come up with a better name for the various pieces.

You know, terminology that ignores the fact that it more or less resembles an arm that, well, swings.
the parts manual calls that plate the "suspension arm" and that seems a reasonable description to me.
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oopsclunkthud wrote:
the parts manual calls that plate the "suspension arm" and that seems a reasonable description to me.
There’s that term again.
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FFS, will you buggers stop using that term!

Reasonable treasonable.
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jimc wrote:
FFS, will you buggers stop using that term!

Reasonable treasonable.
Wait, which term are you admonishing us for now?
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It is the exhaust bracket it always has been and always will be.
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jimc wrote:
FFS, will you buggers stop using that term!

The only way I see around this is the classic MV autocorrect, such as cupcake and torreador pants.. Razz emoticon
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Max6200 wrote:
It is the exhaust bracket it always has been and always will be.
Holding the exhaust is the least important function it performs. It transfers approximately 50% of the suspension load through the shock mount.
OP
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UTC quote
What have I done!
Parts manual calls it the"right arm"
Maybe we should just use a pictogram.
swingarm-swingarmplate-exhaust carrier-exhaust bracket-rightarm
swingarm-swingarmplate-exhaust carrier-exhaust bracket-rightarm
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jess wrote:
Wait, which term are you admonishing us for now?
"Reasonable" Who wants to be reasonable!
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jimc wrote:
I have no argument with *that*. There are loads of very competent linguists who do commercial translations - unfortunately almost all of them have zero technical background. Engineers who are fluent in two or more languages are few and far between (but there are some on this forum) and they almost never get asked to do the paperwork translations.
Reminded me of this :
Quote:
While at work I was thinking about this same lack of care in the digital computer manuals I was editing. Writing and editing technical
manuals is what I do for a living the other eleven months of the year and I knew they were full of errors, ambiguities, omissions and
information so completely screwed up you had to read them six times to make any sense out of them. But what struck me for the first
time was the agreement of these manuals with the spectator attitude I had seen in the shop. These were spectator manuals. It was built
into the format of them. Implicit in every line is the idea that "Here is the machine, isolated in time and in space from everything else in
the universe. It has no relationship to you, you have no relationship to it, other than to turn certain switches, maintain voltage levels,
check for error conditions—" and so on. That’s it. The mechanics in their attitude toward the machine were really taking no different
attitude from the manual’s toward the machine, or from the attitude I had when I brought it in there. We were all spectators. And it
occurred to me there is no manual that deals with the real business of motorcycle maintenance, the most important aspect of all. Caring
about what you are doing is considered either unimportant or taken for granted.
OP
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seamus26 wrote:
Reminded me of this :
Is that from ZAMM?
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KimPossible wrote:
Is that from ZAMM?
Yeppers. Between that and "How To Keep Your Volkswagen Alive" by John Muir, much of my mechanical philosophies were shaped.

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