09 Lx50 USDM project
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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 42
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: 42
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: 42
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: 42
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: 42
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: 42
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: 42
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.

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Member
09 Lx50
Joined: 29 Jul 2019
Posts: 42
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: 42
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: 42
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: 42
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: 42
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: 42
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: 37
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: 42
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...
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