Coolant hose-- which one?
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2006 Piaggio Fly 150, 2016 Vespa GTV300ie
Joined: 02 Mar 2021
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Location: USA
Mon May 03, 2021 6:13 am quote
I rode my new-to-me 2016 gtv300 to work last week, and just as i arrived, I got a whiff of coolant... Turns out she sprung a pinhole leak on a coolant hose. Thankfully it happened JUST as I arrived and no further damage was done! I took a pic of the leak in progress, attached here.

So, I'm not the handiest person with this stuff, and I'm debating if I want to tackle this fix on my own. On one hand it's just a hose replacement, so it should be fairly easy, right? On the other hand, it looks like I'm going to have to disassemble half the scooter to access it, and I'm not sure I have all the tools to do so. Also, I'm not having any luck finding the exact hose I need to order to replace it-- I've looked at the diagrams on Scooterwest, but I'm not confident I'm ordering the correct stuff.

Any advice or suggestions?



Veni, Vidi, Posti
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Mon May 03, 2021 6:17 am quote
By sending the chassis number to Scooterwest you will get the right spare part, they know it.
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Mon May 03, 2021 7:12 am quote
Whereís it leaking from specifically? It may just be that the clamp is toast and fitting a new and better one will solve the problem.
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Mon May 03, 2021 7:38 am quote
Ooh, that's a nice leak...

It's more a PITA to remove plastic than technically challenging....and you don't need a bunch of tools, unless I've forgotten something. IIRC the coupling for the hose is under the floorboard, so once that's up Bob's your uncle.... or something like that.
Member
2006 Piaggio Fly 150, 2016 Vespa GTV300ie
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Mon May 03, 2021 8:04 am quote
Oh, it's definitely not a leak at the clamp, it's from a hole in the hose itself... It was literally spraying out like a garden hose. You can see the spray in the photo. Here was the end result!



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Mon May 03, 2021 8:16 am quote
Get it to your dealer=easiest. Tape as temp repair.
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Mon May 03, 2021 8:57 am quote
The question is: how did he get a hole like this and in that area?
Member
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Mon May 03, 2021 9:03 am quote
Attila wrote:
The question is: how did he get a hole like this and in that area?
I would love to know!! The scooter is only 5 years old and has been garage-kept, I can't imagine anything is dry-rotted yet. The ride in to work was uneventful, I didn't hit anything that kicked up on the road, like a rock or something. My only guess is that I did install a set of Faco crash bars prior to this ride... I don't RECALL whacking the hose with anything while I was installing, but I suppose it's possible??? It's within a couple of inches of where I was fiddling with a wrench and screwdriver.
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Mon May 03, 2021 9:11 am quote
656437 is the part you need.
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Mon May 03, 2021 8:07 pm quote
cnvh wrote:
My only guess is that I did install a set of Faco crash bars prior to this ride... I don't RECALL whacking the hose with anything while I was installing, but I suppose it's possible??? It's within a couple of inches of where I was fiddling with a wrench and screwdriver.
Almost certainly the two are connected. Lots of people have punctured that pipe when installing side crash bars. The screw holding the bar in place doesn't have to be touching the pipe, when you sit on the scooter, the weight of the rider pushes the pipe onto the offending screw. Replacement of the pipe is straightforward but fiddly involving removal of the floor. If you are not too confident, get your dealer to do it. It's also a good time to replace those one time use hose clamps.
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Tue May 04, 2021 4:29 am quote
Touring300 wrote:
cnvh wrote:
My only guess is that I did install a set of Faco crash bars prior to this ride... I don't RECALL whacking the hose with anything while I was installing, but I suppose it's possible??? It's within a couple of inches of where I was fiddling with a wrench and screwdriver.
Almost certainly the two are connected. Lots of people have punctured that pipe when installing side crash bars. The screw holding the bar in place doesn't have to be touching the pipe, when you sit on the scooter, the weight of the rider pushes the pipe onto the offending screw. Replacement of the pipe is straightforward but fiddly involving removal of the floor. If you are not too confident, get your dealer to do it. It's also a good time to replace those one time use hose clamps.
Scooterwest replied to my inquiry and agreed that the hose I need is the one referenced above, and they also mentioned that the likely culprit was the crash bar. So what does that mean, do I need to uninstall the crash bars?? I'll be pretty salty to be out the ~$150 on the crash bars, if the design is common enough that this happens on the regular then I don't know why they are selling them without some sort of warning about it. Grr.

Anyway, thanks all for your hep and input! I think I am going to try to replace the hose on my own; it'll be good to know how to remove body panels if needed. If anyone knows of any great videos about the process, please share links!
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Tue May 04, 2021 5:29 am quote
Put a shorter bolt ...
Or turn and put the bolt head upside down.
Member
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Tue May 04, 2021 5:55 am quote
The leak, however, is directly on the bottom of the hose in question. I'm confused as to how the bolt from the crash bar could have nicked the UNDERSIDE of the coolant hose??? If anything I would think it would have cut the side, not the bottom.
Veni, Vidi, Posti
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Tue May 04, 2021 8:35 am quote
cnvh wrote:
The leak, however, is directly on the bottom of the hose in question. I'm confused as to how the bolt from the crash bar could have nicked the UNDERSIDE of the coolant hose??? If anything I would think it would have cut the side, not the bottom.
Two other possibilities:

you accidentslly hit something with the pipe.

Sabotage
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Tue May 04, 2021 11:55 am quote
Hose replacement is relatively easy. I have done that on the sidewalk here in Brooklyn. I believe everyone on the forum will suggest that whether you do the work yourself or get it done, replace those single use clamps with simple stainless steel hose clamps, you can find them at any box hardware store on the online stores all over the internets.
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Tue May 04, 2021 4:50 pm quote
baba12 wrote:
Hose replacement is relatively easy. I have done that on the sidewalk here in Brooklyn. I believe everyone on the forum will suggest that whether you do the work yourself or get it done, replace those single use clamps with simple stainless steel hose clamps, you can find them at any box hardware store on the online stores all over the internets.
I've understood that generic hose clamps aren't ideal.....IIRC the open design of the clamp is rough on the hose, and there is a design that's a tad more pricey, but there are no perforations on the band.

Edit: Okay, here we go. I think the key word is "embossed." This link is just an example....I'm taking a stab at the dimensions. Not cheap, but you can use your allotment and pass on the rest, as someone did for me.

Edit 2: Madison beat me to the punch at a fraction of the cost. Use that link!

Last edited by fledermaus on Tue May 04, 2021 5:21 pm; edited 2 times in total
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Tue May 04, 2021 5:02 pm quote
fledermaus wrote:
baba12 wrote:
Hose replacement is relatively easy. I have done that on the sidewalk here in Brooklyn. I believe everyone on the forum will suggest that whether you do the work yourself or get it done, replace those single use clamps with simple stainless steel hose clamps, you can find them at any box hardware store on the online stores all over the internets.
I've understood that generic hose clamps aren't ideal.....IIRC the open design of the clamp is rough on the hose, and there is a design that's a tad more pricey, but there are no perforations on the band.
You want one like this:

https://www.amazon.com/gp/product/B002M8PGUW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

But get there this way:

https://www.amazon.com/?tag=modevesp-20&linkCode=ur1

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Wed May 05, 2021 7:11 pm quote
I just had to fix a coolant leak on the lefthand side under the floorboard of my '18 GTS.

While not technically difficult, and going from memory:
- glovebox off (which is a pain since you might decide as I did the headset plastic gets loosened to enable glovebox removal)
- crash bars off
- side skirts off - be careful with the plastic tabs that hold them near the passenger footpegs, easy to break off
- passenger footpegs off
- battery cover off
- floorboard off
- replace hose
- reinstall, reverse order

It'll happen anyway but drain / replace your coolant so you're good for another couple of years. Make sure to bleed your coolant from air in the system (see the WIKI on this in MV) and DO NOT strip the air bleed easy to do read the forums on folks bitten by this.

Have I forgotten anything? Else pay your trusty vespa service shop to do the above
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Wed May 05, 2021 9:16 pm quote
voodooskin wrote:
Have I forgotten anything? Else pay your trusty vespa service shop to do the above
Probably stating the obvious, but take the scooter for a road test before replacing the floor and glove box to check for any new leaks from the newly installed hose clamps.
Member
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Thu May 06, 2021 11:50 am quote
Thank you all for the suggestions and input! The parts have all been ordered and due to arrive tomorrow from Scooterwest. I'm hoping to tackle the project myself on Saturday, if I can get a second set of hands and the weather cooperates. Sounds like removing all the body pieces will be more of a question of patience than anything!
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Thu May 06, 2021 4:01 pm quote
cnvh wrote:
Sounds like removing all the body pieces will be more of a question of patience than anything!
You've got it. Not that technically challenging, but feels a bit like deconstructing a puzzle....
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Thu May 06, 2021 5:11 pm quote
baba12 wrote:
Hose replacement is relatively easy. I have done that on the sidewalk here in Brooklyn. I believe everyone on the forum will suggest that whether you do the work yourself or get it done, replace those single use clamps with simple stainless steel hose clamps, you can find them at any box hardware store on the online stores all over the internets.
No, no NO! Do NOT use the common-or-garden hose clamps. They have several problems compared to the good ones (Jubilee clips and their ilk).

1. Completely cut-through holes for the worm gear - these collapse as soon as any sensible torque is applied.

2. The worm gear housing can split open and fail when they're tightened up.

3.. Sharp edges on the circumference - when they're tightened up (if they survive that long), these will cut into the hose and cause another leak. Especially perfidious when used on fuel hoses.

4. Not all parts are necessarily stainless. They can fail through corrosion.

The good ones cost quite a bit more, expect to pay 50 cents to $2 each. But they last.
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Thu May 06, 2021 5:27 pm quote
I'm partial to Norma clamps, not the cheap copies you see on Amazon, the real ones from Germany. I've never had one fail. Buy the correct size for the pipe, not something that "fits" anything from 1/4 inch to a foot.
Member
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Fri May 07, 2021 5:25 am quote
I ordered the recommended clamps (plus a couple extras) from Scooterwest, so I assume they're the "good" ones.

Y'all have really been a confidence boost, I'm actually kinda looking forward to tackling this project!
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Fri May 07, 2021 9:48 am quote
Removing body panels.
DON'T forget the rubber band on the latch for the glove box. Very important.
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Sat May 08, 2021 1:41 pm quote
I very much appreciate your commitment to MVís Amazon Associates links. That said, Iíve fixed the code that adds our tag to Amazon links, so it should be automatic now.

Last edited by jess on Sat May 08, 2021 1:49 pm; edited 1 time in total
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Sat May 08, 2021 1:42 pm quote
jess wrote:
I very much appreciate your commitment to MVís Amazon Associates links. That said, Iíve fixed the code that adds our tag to Amazon links, so it should be automatic now.
Cool!
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Sat May 08, 2021 1:51 pm quote
Madison Sully wrote:
Cool!
Having said that, itís not adding the tag to the message I quoted (yours) for some reason, even though it did on your original message. So clearly I still have some bug-hunting to do.

Oh well. Some progress, anyway.
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Sat May 08, 2021 2:11 pm quote
jess wrote:
Having said that, itís not adding the tag to the message I quoted (yours) for some reason, even though it did on your original message. So clearly I still have some bug-hunting to do.

Oh well. Some progress, anyway.
Interesting.
When I click on the upper link in my original post, I can see the MV tag.
https://www.amazon.com/dp/B002M8PGUW/?tag=modernvespa-forum-20

But when I click on the same link in your quote, no tag.
https://www.amazon.com/gp/product/B002M8PGUW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Petty Tyrant
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Sat May 08, 2021 2:22 pm quote
Madison Sully wrote:
Interesting.
Yep. Thatís the bug. Tracking it down now.
Petty Tyrant
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Sat May 08, 2021 2:38 pm quote
Madison Sully wrote:
Interesting.
When I click on the upper link in my original post, I can see the MV tag.
https://www.amazon.com/dp/B002M8PGUW/?tag=modernvespa-forum-20

But when I click on the same link in your quote, no tag.
https://www.amazon.com/gp/product/B002M8PGUW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Okay, all fixed now. Thanks again for your help and support.
Member
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Mon May 10, 2021 6:10 am quote
I was able to successfully disassemble my GTV this weekend and changed out the leaking coolant hose. Thank you all for the encouragement, it really was not that bad of a job to do-- I'm pretty proud of myself for a first attempt at any significant scooter maintenance! The FACO crash bar bracket was 100% the culprit; what a terrible design flaw. I'm pretty irked about that, but I digress...

Anyway, the final thing I need to do is to bleed the air put of the coolant system. (We were running out of daylight on Saturday, so I figured the bleeding can wait until the next nice day.) Someone upthread mentioned a Wiki page on MV about this process; pardon my lack of search skillz, I tried locating that Wiki article on here but to no avail. I would like to get a little hose to do this, but I'm not sure what size hose I will need? Is it like a fish-tank air hose, or what?
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Mon May 10, 2021 6:42 am quote
This might help.......

Member
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Mon May 10, 2021 6:59 am quote
Yes, I watched that vid (a number of times, lol) but there's no specifics on the little bleed hose size. It looks like pretty standard fish-tank-style hose, but I'm not sure?
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Mon May 10, 2021 7:09 am quote
You could measure the bleed valve diameter, or, the hose is cheap enough, get a couple of "close" sizes at the hardware store. Or me like me, get the closest one I think, take it home, find out it's wrong and go back for the next size.

It's a bit messy, but you could just bleed it out over the engine and rinse it down later. Yeah, not nice stuff to be letting loose like that, but considering I've kicked over a couple of collection bottles by now, same thing. It's only a couple of ounces anyway. .....
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Mon May 10, 2021 7:18 am quote
cnvh wrote:
Yes, I watched that vid (a number of times, lol) but there's no specifics on the little bleed hose size. It looks like pretty standard fish-tank-style hose, but I'm not sure?
I've just measured mine, 7mm internal diameter is a snug fit over the bleed nipple and nut.
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Mon May 10, 2021 7:20 am quote
Be very careful how you tighten up the bleed nipple when done. Just finger-tight is all it needs - just 3Nm, no more, else you'll be paying for a new thermostat housing.
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