09 Lx50 USDM project
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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Mon Aug 19, 2019 12:03 pm quote
Hi All,

About a month ago I picked up an Lx50 in San Francisco. Previous owner said he used it for commuting, but the rear wheel wouldnít turn anymore so he stopped riding it. It had been sitting for 3 months prior to me getting it.

When I went to pick it up it started with E start and when throttle was applied the wheel wouldnít turn, but the axle would spin inside the wheel.

I got it home and strarted it up with no problems. I let it idle for 10 minutes or so. I was very happy that it started again thinking all I have to do is replace the rear axle and I can ride it!!! Iím stoked as this is my first Vespa woot woot! 🛵

Ps. Can anyone help me on how to post multiple pictures? Itís only letting me post a single picture.

I look forward to all your help and advice on helping me getting her running. More to come.

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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Mon Aug 19, 2019 12:04 pm quote
Rear shot

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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Wed Aug 21, 2019 10:19 am quote
Well it didnít work out as planned. The next day the scoot didnít want to start. So I cleaned the carb, drain fuel, and removed spark plug.

I was surprised how easy it was to get to the carb, but the dang spark plug was a whole other story!!!! Plug was so hard to install!!! It ended up getting stuck between the engine and plastic shrouds. I tried to force it out, but since I was doing it blindly, I didnít want to use too much force and break anything.

Well I couldnít free up the stuck plug and I decided to pull the motor out. Pulling the motor was easier than installing the plug. Soo annoying. All I wanted was to hear her start again. Even tho I knew I couldnít ride it.



Stuck plug.

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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Wed Aug 21, 2019 10:20 am quote
Stuck plug.

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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Wed Aug 21, 2019 10:23 am quote
Tear in diaphragm. Would this prevent scoot from starting or give poor performance?

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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Wed Aug 21, 2019 10:25 am quote
Bent conical pin. What issues can this cause?

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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Wed Aug 21, 2019 10:28 am quote
Motor out. Itís been out for about 2months now. I probably wonít be able to get all the parts for repair for another month or so. I hope I remember how to put everything back together.

F6472208-DAF0-44DA-9929-551699AA41BD.jpeg

Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Wed Aug 21, 2019 10:29 am quote
Motor out. Itís been out for about 2months now. I probably wonít be able to get all the parts for repair for another month or so. I hope I remember how to put everything back together. 🤯

F6472208-DAF0-44DA-9929-551699AA41BD.jpeg

Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Wed Aug 21, 2019 10:33 am quote
Looks like there is no axle washer installed. Iím assuming thatís what caused the stripped axle and wheel hub.

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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Wed Aug 21, 2019 10:35 am quote
Stripped axle

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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Wed Aug 21, 2019 10:37 am quote
Stripped wheel hub 👎

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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Wed Aug 21, 2019 10:40 am quote
New oem axle. $25shipped from eBay. I feel like I got a good deal. Hehe. 💆‍♂️

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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Wed Aug 21, 2019 10:48 am quote
New axle.

Well that is where I am at for right now. I am currently hunting down the best prices for the parts I need to repair. I am also doing research on how to replace the rear axle. So far this is what I think I need to do the axle job.

Wheel
Axle (I have)
Rear Hub seal
Gear oil
Washer for axle nut

I have never worked on scooter gears before so I am kind of nervous, it doesnít look to hard. I read that Bearing replacement is optional, but I havenít done that before either.

Are these all the parts I need for the axle job? Any tips on how to do the job would be much appreciated.

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Member
Vespa LX50 4t
Joined: 29 Aug 2007
Posts: 39
Location: The Netherlands
Mon Sep 16, 2019 11:03 am quote
Hi, nice project you're having!

Just for your information: I didn't find a washer on the rear axle of my 2007 LX50 either. Vespa sometimes makes changes to using washers or not (for example, the exhaust screws sometimes use 2 washers, sometimes just 1), so maybe it shouldn't be there after all.

Good luck, let us know how you proceed.
Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Mon Sep 16, 2019 12:42 pm quote
Mopmop wrote:
Hi, nice project you're having!

Just for your information: I didn't find a washer on the rear axle of my 2007 LX50 either. Vespa sometimes makes changes to using washers or not (for example, the exhaust screws sometimes use 2 washers, sometimes just 1), so maybe it shouldn't be there after all.

Good luck, let us know how you proceed.
Thank you for the info. Thatís very interesting. Iíll have a look at the manual again to confirm, but if it doesnít need washer, I wonder how it got stripped in the first place?Hmmm...

Unfortunately, I am still at the same stage of the project, but hope to finish it before the end of Oct.
Enthusiast
2010 S50 Modified
Joined: 18 Feb 2017
Posts: 57
Location: Deepinnaharta, Texas
Thu Sep 19, 2019 4:45 pm quote
Greetings:

Just speculating here; I've never seen the axle and wheel hub splines sheared off like that, even with the most abusive operation. One way it can happen; perchance did the P.O. mention if he'd recently changed the rear tire? If he (or his "mechanic" just smacked the wheel on there and got frisky with the rattle gun before aligning the splines, they can demolish each other as the force of the wheel nut crushes the hub inward. This exact thing is posted multiple times on the HondaSpree.net site, as people (mis-) assemble the outer pulley sheave onto the crankshaft. The crankshafts subjected to this look just like your stripped axle.

You mentioned you disassembled the carb when it wouldn't restart. That diaphragm was working at first when you got it home? They seldom tear spontaneously, but again assembly error is frighteningly easy to do. These Keihin CVs (Had a 40mm version on my Harley...) are a PITA to reassemble. I've seen it dozens of times, though of course I never did it.

The darn thing refuses to stay where it's put. You will need a new diaphragm, as the throttle snail opens an internal butterfly as you saw, but the diaphragm lifts the needle jet when vacuum above the rubber bellows builds. If there's a hole, it won't lift. Another easy thing to do is force the needle holder crooked into the little bore in the carb. Hate to say it, pard, but assembly error is probably responsible here too. Not saying YOU did it, y'understand.

One trick to try with the new diaphragm (and needle). Pre-assemble the needle, slide, and spring to the diaphragm. Freeze the rubber in your Kitchenaid freezer before beginning assembly to the carb. Have everything ready with the carb to reinstall the assembly, hold your left leg up, stick your tongue out to the right and say a little prayer as you CAREFULLY compress the spring under the top cover back over the diaphragm once it's in position. If it pops up, start over. Hold it all in position and screw a random phillips-head down finger-tight, doing one and then the one diagonally across. CHECK the diaphragm position before installing the remaining two. Then check the needle is in the main jet receiver. Check everything again before tightening all 4 down to Spec torque. It MUST all be airtight.

When all else fails, if you know anyone with an older (pre-injection) H-D, take it to him (or Her, in Politically-Correct Kalifornia...) and watch carefully when they do it. I'd like to see a video of it myself...
Member
Vespa LX50 4t
Joined: 29 Aug 2007
Posts: 39
Location: The Netherlands
Mon Sep 23, 2019 1:14 am quote
OLKsCMounTainS wrote:
Mopmop wrote:
Hi, nice project you're having!

Just for your information: I didn't find a washer on the rear axle of my 2007 LX50 either. Vespa sometimes makes changes to using washers or not (for example, the exhaust screws sometimes use 2 washers, sometimes just 1), so maybe it shouldn't be there after all.

Good luck, let us know how you proceed.
Thank you for the info. Thatís very interesting. Iíll have a look at the manual again to confirm, but if it doesnít need washer, I wonder how it got stripped in the first place?Hmmm...

Unfortunately, I am still at the same stage of the project, but hope to finish it before the end of Oct.
Update: I ordered an official Piaggio washer, but it doesn't fit. Well, the washer fits, but because it's pretty thick (about 2mm), the security pen doesn't fit in the axle anymore.

So definitely my 2007 LX50 was made to be used without a washer.

(Even though I feel that's pretty stupid. The nut alone won't spread the forces as well as a nut with a washer. Italians... )
Ossessionato
73 Rally, 74 Rally, 76 ET3, 80 P200, 63 Li125, 65 Li225 Silver Special, 86 Elite 80, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3283
Location: Oceanside/ SF
Mon Sep 23, 2019 3:46 am quote
I believe access to the axle on 50ccís is behind the clutch as opposed to behind the tire. So drain the oil, remove the clutch, remove the final drive housing, remove the gasket and then you should be able to swap the old axle with the new one.

As far as bearing replacement goes I have no idea but would assume youíll need a puller to remove the old one and then a hydraulic press/ suitable drift to install a new one. If you have the time and money, Iíd just buy a new bearing instead of reusing the old one/ having to worry about a puller. Iíd also buy a new final drive gasket. Iíd hate to skimp there and have gear oil get all over the belt/ clutch.

Then reverse your steps and then add some oil before you forget.

Then carb clean/ install/ dont forget to add the air snorkel and fire it up. Leader engine carbs need the snorkel installed to run correctly.
Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Mon Sep 23, 2019 7:54 am quote
@wheelman: Thanks for your advice. Nice to meet you as a Iím a member of Hondaspree.net as well.

I will most definitely be careful next time on carb disassembly and assembly. I honestly think I tore it upon disassembly as I just pulled the diaphragm out vs using a tool to gently scrape it. Diaphragms are like $50 bucks each, not cheap. Lolz.

Rolling wrench has a video of cleaning a Vespa lx50 carb, but he charges for it, so I havenít seen it it.

Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Mon Sep 23, 2019 8:01 am quote
Mopmop wrote:
OLKsCMounTainS wrote:
Mopmop wrote:
Hi, nice project you're having!

Just for your information: I didn't find a washer on the rear axle of my 2007 LX50 either. Vespa sometimes makes changes to using washers or not (for example, the exhaust screws sometimes use 2 washers, sometimes just 1), so maybe it shouldn't be there after all.

Good luck, let us know how you proceed.
Thank you for the info. Thatís very interesting. Iíll have a look at the manual again to confirm, but if it doesnít need washer, I wonder how it got stripped in the first place?Hmmm...

Unfortunately, I am still at the same stage of the project, but hope to finish it before the end of Oct.
Update: I ordered an official Piaggio washer, but it doesn't fit. Well, the washer fits, but because it's pretty thick (about 2mm), the security pen doesn't fit in the axle anymore.

So definitely my 2007 LX50 was made to be used without a washer.

(Even though I feel that's pretty stupid. The nut alone won't spread the forces as well as a nut with a washer. Italians... )
Thatís very interesting Mopmop. I took a look at the parts diagram that scooterwest sent me and it does indeed need a washer for my 09 lx50.

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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 45
Location: Santa Cruz Mountains
Mon Sep 23, 2019 8:58 am quote
MJRally wrote:
I believe access to the axle on 50ccís is behind the clutch as opposed to behind the tire. So drain the oil, remove the clutch, remove the final drive housing, remove the gasket and then you should be able to swap the old axle with the new one.

As far as bearing replacement goes I have no idea but would assume youíll need a puller to remove the old one and then a hydraulic press/ suitable drift to install a new one. If you have the time and money, Iíd just buy a new bearing instead of reusing the old one/ having to worry about a puller. Iíd also buy a new final drive gasket. Iíd hate to skimp there and have gear oil get all over the belt/ clutch.

Then reverse your steps and then add some oil before you forget.

Then carb clean/ install/ dont forget to add the air snorkel and fire it up. Leader engine carbs need the snorkel installed to run correctly.
Thank you for the advice MJrally. I definitely wonít skip the hub gasket. As for the bearings, I hope they are still functioning correctly so I can avoid the need to replace them.

Well so far Iím still at a standstill because of time and cash flow. The plan was to order all parts for axle swap, new belt, rollers and carb parts. The total is in the $300 range. Then install everything altogether and hope she runs after that woot woot, but It may change to just doing the axle and putting the motor back in for now.

I want to have it on wheels so I can at least have it mobile before this cold wet weather comes around. Iím also going on a trip to Maui in November so Iím saving for that as well. The life of a broke enthusiast. Sighhh lolz. Haha.

So the plan before my trip is to get a wheel/tire, hub gasket/seal, I have the axle. Do the axle swap and install the motor before I forget how to put it back together. Haha That would allow me to have it mobile and can easily store it where needed.

Then when time and money allow Iíll get the carb parts and service it. Hopefully it will run after that and I will have peace of mind. Hehe. Then fine tune it over winter or spring and ride it over the summer. Sighhh.... lolz. 🛴🛵🇮🇹
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