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@spirovision avatar
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GTS super 300
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@spirovision avatar
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UTC quote
Hi I am having a bit of an issue bottoming out sometimes on rough roads when two up.
I had an injector problem (could not figure out what the problem was finally took it to the dealer ) and the mechanic suggested this may have been the culprit hitting some potholes.

my preload is set to the stiffest. but still I am heavy 220lbs and with some gear clothing lunch and sometimes my gf at 145lbs

so....
I could change the rear shocks to something stiffer like yss but I am not really there and in general am happy with the handling of the vespa.

I was wondering if these risers would help by adding some height (about 30-40 mm depending.) so the pet carrier won't hit the injector. Could this be an inexpensive and easy fix. I know it will raise the height but I am ok with that.

https://scooterpartshop.com/collections/shock-extension/products/raising-kit-cnc-40mm-silver-for-piaggio
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@amateriat avatar
UTC

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2015 GTS 300 Super (Melody: 2015-2021, RIP), 2022 GTS SuperTech (Thelonica; bit the dust 02-22-23)
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@amateriat avatar
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UTC quote
I'm pretty certain this is why the fuel injector on my GTS eventually broke in two and left me stranded on the New Jersey Turnpike a bit under two years ago: the original rear shocks started bottoming out about that time, and I'd hit the mother of all potholes about two months before riding beneath the BQE, which likely caused the fracture that eventually led to a complete break.

What I ended up doing is what I strongly recommend to you: bite the bullet and simply upgrade to better shocks. I bought Malossi RS24 shocks, front and rear, and while not exactly cheap, I've never regretted the decision: while the ride is somewhat firmer (which can be tweaked via adjustable preload and damping, front and rear), the bike tracks and corners better to me, and unlike the throwaway stock springers, are actually rebuildable.

Oh, yes: no more bottoming-out. Ever.
Rubber still meets the road, just better.
Rubber still meets the road, just better.
⚠️ Last edited by amateriat on UTC; edited 1 time
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UTC quote
Spirovision wrote:
I was wondering if these risers would help by adding some height (about 30-40 mm depending.) so the pet carrier won't hit the injector. Could this be an inexpensive and easy fix. I know it will raise the height but I am ok with that.

The scooter will still bottom out
The seat will be 30-40mm higher when it happens
UTC

Hooked
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Hooked
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UTC quote
Risers will give less caster for front which means less trail. Might give some issues for handing.

https://www.cycleworld.com/2015/05/22/cycle-world-tips-and-tricks-understanding-motorcycle-rake-and-trail/
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UTC

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UTC quote
If your car started bottoming out, how would you fix it?
UTC

Hooked
2007 Vespa 250 GTS
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UTC quote
I have a problem with a very stiff front shock, I believe I replaced the original the original with a Malossi (IIRC) which is not much better.
Some of my Vespa friends recommended a shock Vespa used a few years ago. It was an Escort 599601. If anyone has one of those, I would like to try it. Even if it is a used one. If not, Motovista, which shock will offer the most improvement?
Thanks
Tony
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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UTC quote
Motovista wrote:
If your car started bottoming out, how would you fix it?
Add a spacer to the springs IF the shocks had some extra extension length. On our cars they do and the springs are separate from the shocks, not combined, so this works. YMMV of course.

On a Vespa the shocks are already at maximum extension and the springs are integral, so there's no way to change the bottoming out except by changing the shocks to a different type.
@amateriat avatar
UTC

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UTC quote
tonymarchman wrote:
I have a problem with a very stiff front shock, I believe I replaced the original the original with a Malossi (IIRC) which is not much better.
Some of my Vespa friends recommended a shock Vespa used a few years ago. It was an Escort 599601. If anyone has one of those, I would like to try it. Even if it is a used one. If not, Motovista, which shock will offer the most improvement?
Thanks
Tony
The front shock on my GTS is a Malossi RS24, which (unlike the original shock the bike came equipped with) has both adjustable preload and damping. Have you tweaked either of those yet?
@fledermaus avatar
UTC

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@fledermaus avatar
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UTC quote
Without going out and bouncing my GTS, what actually happens to damage the injector from bottoming out? I didn't connect the dots at the time when my injector cracked a month ago, but considering my mileage (15K) and weight (260 or so) I'm wondering if I've wandered into that camp. I don't recall any specific bottoming out, but roads around here, as seemingly everywhere, aren't always the best....
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UTC quote
Remove the pet carrier. Cost is zero.
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UTC quote
tonymarchman wrote:
I have a problem with a very stiff front shock, I believe I replaced the original the original with a Malossi (IIRC) which is not much better.
Some of my Vespa friends recommended a shock Vespa used a few years ago. It was an Escort 599601. If anyone has one of those, I would like to try it. Even if it is a used one. If not, Motovista, which shock will offer the most improvement?
Thanks
Tony
If you like the way it rode with a new OEM shock, that would be the good one to replace it with. If you want something that is more durable and better able to handle spirited riding in the hills, I would go with a Malossi first, then probably Bitubo. Mupo made shocks for the GTS, but I haven't seen them available for some time. If you want something like the stock shock but usually a little more durable, Carbone makes a solid shock. I'm not a fan of YSS, and only use them when nobody else makes a shock for a particular application, like my Silverwing.
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UTC quote
fledermaus wrote:
Without going out and bouncing my GTS, what actually happens to damage the injector from bottoming out? I didn't connect the dots at the time when my injector cracked a month ago, but considering my mileage (15K) and weight (260 or so) I'm wondering if I've wandered into that camp. I don't recall any specific bottoming out, but roads around here, as seemingly everywhere, aren't always the best....
Bottoming out can transmit excess force through the scooter, causing the plastic of the injector to crack
OP
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UTC quote
The mechanic explained that hitting the potholes could have caused the connections in the injector to become loose and this was causing the problem (intermittent shut off) he found it luckily . He mentioned that the only other times he had injector problems was from other riders hitting potholes.
I did hit one major pothole on my ride. Here is a photo of the road we were on and a couple of others just to show you road conditions here. I am not so sure even the best shocks would resolve all of the issues. Although I am considering the upgrade to Carbone.
This is the road we were on when I hit the bad pothole.
This is the road we were on when I hit the bad pothole.
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⚠️ Last edited by Spirovision on UTC; edited 1 time
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Hooked
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UTC quote
How about shims on top of the rear shock absorbers? At least not as aggressive solution than risers.

Or some remoulding for helmet bucket with a heat gun? Just thinking.
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UTC

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UTC quote
Man, no way I'd ride a scooter on those roads.
Scooters all have lousy suspension. ...you just gotta find decent roads to ride them on. Log in your memory where the bad roads are...stay off of them.
O.S.
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@spirovision avatar
UTC

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UTC quote
Partanen wrote:
How about shims on top of the rear shock absorbers? At least not as aggressive solution than risers.

Or some remoulding for helmet bucket with a heat gun? Just thinking.
Is shimming possible ? if so how would I go about it? Could I loosen the shocks from the top and just slide some shims in?
I agree less aggressive and easier for sure also would just shim a bit and not have to raise 30-40 mm. ( I know that this would change the handling of the bike it would tip into the corners easier but the front would be less stable. Also another reason not to do it is it would change the position of beam coming from the headlight. )

Remolding is also something I considered. However I am a return to stock kind of guy. So whenever I do any experimental modifications I like to make sure I have the stock ones on hand. So I did start looking for a used bucket, If I could find one that was not too expensive I would reform the front.
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@amateriat avatar
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UTC quote
OldSchooot wrote:
Man, no way I'd ride a scooter on those roads.
Scooters all have lousy suspension. ...you just gotta find decent roads to ride them on. Log in your memory where the bad roads are...stay off of them.
O.S.
I wouldn't treat my ride like an ADV or the like, but I'm fairly adamant about being able to ride wherever there's pavement, hence my decision to upgrade Melody's shocks. Not a lot of suspension travel there, but neither is there for your average big-bore cruiser.
⚠️ Last edited by amateriat on UTC; edited 2 times
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UTC quote
Spirovision wrote:
Is shimming possible ? if so how would I go about it? Could I loosen the shocks from the top and just slide some shims in?
I agree less aggressive and easier for sure also would just shim a bit and not have to raise 30-40 mm. ( I know that this would change the handling of the bike it would tip into the corners easier but the front would be less stable. Also another reason not to do it is it would change the position of beam coming from the headlight. )

Remolding is also something I considered. However I am a return to stock kind of guy. So whenever I do any experimental modifications I like to make sure I have the stock ones on hand. So I did start looking for a used bucket, If I could find one that was not too expensive I would reform the front.
Depends on how close the spring is to coil lock, at some point there is no room for the spring to compress...

A split collar would be the proper device to avoid taking the spring off
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UTC quote
I would start out with a new set of shocks. Then adjust the dampening, etc. Then re-evaluate the potential need for a shim.

I put a new set of Malossi's on my GTS300 and it made a world of difference. Seattle roads suck and I still hit a zillion potholes however no bottoming or related issues once I installed the new shocks.

Dave
@cmatts avatar
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2020 gts 300 super sport hpe
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UTC quote
thank you for this thread - think im having similar issues w bottoming out.

Tried adjusting the stiffness - (im calling it the wrong thing) - sort of helped, but at faster speeds hitting potholes or certain man hole covers i hear a clicking sound. im not sure if its something bouncing in my pet carrier/glove box or something hitting under the scooter.
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UTC quote
cmatts wrote:
thank you for this thread - think im having similar issues w bottoming out.

Tried adjusting the stiffness - (im calling it the wrong thing) - sort of helped, but at faster speeds hitting potholes or certain man hole covers i hear a clicking sound. im not sure if its something bouncing in my pet carrier/glove box or something hitting under the scooter.
re bottoming out:
yup, I used to bottom out at high speeds over gentle undulations on highways. I strongly recommend the SIP shocks.

re sound:
good chance it is something in glovebox/per carrier as you are thinking. I lined my glovebox with 5mm thick foam (with sticky backing) to reduce most of these sounds of things bouncing around.
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UTC quote
By weight carried, including riding clothes,helmets etc, stuff carried in pet carrier and stuff on luggage racks---you are probably over loading bike period--- and nothing will fix it.

Bikes loaded heavy do not handle well either---bottoming is designers' message to you that you are trying make scooter do what it was not designed to do. In
asia they get away with overloading bikes because speeds are very low
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UTC quote
...poor Vespa, that road looks like it was being machine gunned by an M50 ...
⬆️    About 1 year elapsed    ⬇️
@cmatts avatar
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2020 gts 300 super sport hpe
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UTC quote
OldSchooot wrote:
Man, no way I'd ride a scooter on those roads.
Scooters all have lousy suspension. ...you just gotta find decent roads to ride them on. Log in your memory where the bad roads are...stay off of them.
O.S.
I'd never be able to leave the house then. Ha.
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