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150 Sprint V / 50s
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Hi guys

I picked up today a fully restored Vespa 150 sprint veloce.

Rainy day, temperature about 20 degrees.

I picked up my Vespa from the mechanic (best in the city, waiting list with almost a year...) I have ride it less than 5 minutes (they have made 30km after assembling and delivering it to me) and on open road in 4th 60kmh I got the rear wheel blocked, managed to control the bike and then it continued to work perfectly.
I noticed the engine stoped and then it continued, made more 15km to home and then I got another ride after lunch of more 50km. Everything seems to be normal.

It got new bearings, cillinder was rectified, new piston, new camshaft, new exhaust from px200 (if I'm not mistaken) almost everything new. I never went high revs.

Could help me know what happened and what the mechanic should check?

It was scary but it seems to be everything fine...

Check bellow my two vespas, the new 150 and a 50s with a 75cc (never had nay seize...)

Thank you for your help
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Ran out of oil.

Where is Aviero?
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Veni, Vidi, Posti
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Portugal, I'm guessing. And it sounds like a hard seize. You should take it back to the mechanic, if he is that good he will know what to look for and how to fix it. And he should fix it without you having to lay out any Euros.
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Jet Eye Master
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Jet Eye Master
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When running in a fresh engine, riding at low throttle trying to be careful does this. Ironically if riding it harder it would have been fine.
I doubt there's much damage. Up both jets 5% and ride it a bit harder until run in. Then re jet and ride how you wish.
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I will take it there tomorrow.

It runs well but I feel it a little bit of weird vibration, more vibration than my 50s, maybe normal once the motor it's bigger.

The only thing is that when idle, if I pull the clutch it's ok, if I leave it, it makes a different weird noise more metallic...

Other than this it seems normal, a little bit of vibration and noisy but I don't know if it's normal or just the exhaust.

Let's see how it goes...
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Rompneus21 wrote:
I will take it there tomorrow.
Let's see how it goes...
Good, I'm sure the mechanic won't mind. and could pass along some good advice while you are there as Jack did as he know these scoots inside and out and I don't. Meanwhile, those are 2 excellent looking scoots.
⚠️ Last edited by Tierney on UTC; edited 1 time
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It's probably ok, but I would have the mechanic have a look. The sound of the engine will usually change when the clutch is pulled. I'm not sure about the vibration. Sometimes we notice things more after something goes wrong. Since you just got them back, seems a good idea to have them looked over again.

Very nice original bikes. Best way f luck with them.
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Molto Verboso
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Congrats on the resto looks great. With a seizure as you suggest I would certainly have the head off and inspect the cylinder bore. Have you checked the spark plug color for an indicator of the carburetion? Better yet post each size of your jets, carb size, air filter type etc for better feedback. A photo of your plug would be useful. The scooter may be too new to you after rebuilding to know if something is not up to snuff. A compression check could be a quick analysis. Probably not a P200 exhaust that would not fit on a 177 cylinder.
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You can check a video idling and pushing the clutch
https://photos.app.goo.gl/4geQ852N6xXwF7jb8

And the plug it's bellow, I have the mixture with 4% Castrol Power Racing 2T
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Molto Verboso
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Molto Verboso
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Is that a cold or hot plug? Best when warmed up if you can run it up to high RPM in 2nd gear, clutch and cut ignition then check the plug it will give you a better idea.

Probably OK to go to 2% on the premix.

Idling sounds good until it ran out of gas fuel valve was OFF so you know that is working.

Usually when the rear wheel locks up something funky is going on. With something just rebuilt and pretty, good idea to make all the proper checks so it doesn't happen again.
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4% mix? Is this a stock scoot or you running an aftermarket kit?
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It was a weird situation, I think it didn't had time to warm up, I rode 3km very slow in the middle of the town, the I hit the national road, accelerated very lowly through the gears and rode no more than 5 minutes at 60/65km in 4th... It locked the wheel for a few seconds (didn't have weird noises before or after) then got back, not remember if I needed to reduce gears or something and I continued to go, I didn't even stopped...
It was about 15°C with light rain.

It's a cold plug, it's a denso w24fsr equivalent to ngk BR8HS.

The 4% premix was the "just in case" to have more lubrication, it's everything more stock as possible, new crankshaft, cillinder is the original, only rectified, the piston it's new, just a letter above and the head I think it's new also.

This is the motor a few weeks ago being reassembled
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4% will make it run lean…

You'll have more lubrication, but it should be overheating…
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Rompneus21 wrote:
It was a weird situation, I think it didn't had time to warm up, I rode 3km very slow in the middle of the town, the I hit the national road, accelerated very lowly through the gears and rode no more than 5 minutes at 60/65km in 4th... It locked the wheel for a few seconds (didn't have weird noises before or after) then got back, not remember if I needed to reduce gears or something and I continued to go, I didn't even stopped...
It was about 15°C with light rain.

It's a cold plug, it's a denso w24fsr equivalent to ngk BR8HS.

The 4% premix was the "just in case" to have more lubrication, it's everything more stock as possible, new crankshaft, cillinder is the original, only rectified, the piston it's new, just a letter above and the head I think it's new also.

This is the motor a few weeks ago being reassembled
Piston/cylinder bore clearance?
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I don't know exactly the piston/cillinder clearance, I will ask today.

Went to the work 15km and everything ok with it...
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Hi everyone,

I taken it to the mechanic and they had it for a week (I was not at the country) and I picked up and they said it was all ok about the motor, just fixed other minor things.

I have been riding it so far, made more 150Km but I think the vibration is excessive, after 20Km my feet get numb and it's quite uncomfortable. May I damaged some bearing? It's normal so much vibration? I know that it's a 50 year motorcycle but I think it's not normal feel all this vibration and get hands and feet numb.

Vibration is at any speed or rotation it's kind of constant

What do you think?
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Rompneus21 wrote:
Hi everyone,

I taken it to the mechanic and they had it for a week (I was not at the country) and I picked up and they said it was all ok about the motor, just fixed other minor things.

I have been riding it so far, made more 150Km but I think the vibration is excessive, after 20Km my feet get numb and it's quite uncomfortable. May I damaged some bearing? It's normal so much vibration? I know that it's a 50 year motorcycle but I think it's not normal feel all this vibration and get hands and feet numb.

Vibration is at any speed or rotation it's kind of constant

What do you think?
i dunno man, i don't have a lot of confidence. did the shop remove the cylinder inspected the cylinder walls and piston?

all my bikes have vibration, some more than others. excessive vibration can be an issue. hard to say unless i felt it or heard it.
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108 wrote:
4% will make it run lean…

You'll have more lubrication, but it should be overheating…
^^ This, and the overheat will make it seize

Hard seize at speed, with a release of the engine back to relatively high speeds... possible an ever so slight twist in the crank? Crank is now not running true? Not enough to keep it from running, but enough to give constant vibrations??? Just throwing out ideas....

BTW, very nice looking scoots
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Nedminder
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I suspect you may be jetted too lean.

The vibration you describe can be a result of lean jetting also.

What size carb, and what is your "jet stack"

If you don't know, ask the mechanic to tell you.

Also ask him if he up jetted when he put the new parts on.
He should have if that's a performance cylinder "kit".
He should also know what jets he used and what used to be on there.
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Hi!
You can see another video where the vibration is quite noticeable:
https://photos.app.goo.gl/mV7SD4cqheanD7bAA

Maybe it's worse than just bad jetting...

This is a new spark plug BR9HS
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Nedminder
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Well - I agree - it sounds pretty ragged.
It also sounds lean - listen to how slowly it comes back down to idle.

You've had it seize.
It comes back to idle slowly.
It vibrates and sounds ragged.

Sure sounds like lean conditions to me.

Specifically what cylinder do you have on it - and what do you mean by "rectified"?
Is it stock?

Pretty bike.
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I mean, the cylinder was machined to a larger diameter to accommodate a new larger piston, don't know for sure what diameter they have used.

I have rotated a couple of turns out the idle jet and improved a bit, vibration have reduced for a little bit more tolerable and idling there is almost none...

The flywheel (without spark plug) has a really small play and when you rotate it by hand and it is harder to rotate on some positions , it's normal?
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Nedminder
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Yes, this is normal.
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I will continue to mess around with the idle jet and try to learn more how to tuning the carburetor.

If I take out much the idle jet, it can fall off right? Then I should use a bigger one?

Sorry for the dumb questions...
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Rotated a couple of turns on the idle jet (the one on the back)

It reduced a little bit the vibration, when I accelerate, she goes down on rotations slowly and then after 15/20 seconds it dies.

This is a symptom of lean mixture?

Tomorrow I will go back to the mechanic and ask all the details on cylinder, piston and all the jets they used...
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Video, screwed in and 4 turns out

https://photos.app.goo.gl/Y6qMewzB8LbrP2vz7
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Jet Eye Master
PX221 MHR, O tuned PX200, PX125 and some motorbikes
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Rompneus21 wrote:
Video, screwed in and 4 turns out

https://photos.app.goo.gl/Y6qMewzB8LbrP2vz7
Nice. Put the idle screw full in. Then, slowly in on the mixture screw until it speeds up. 2.5 turns if fine thread.
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That's NOT the "idle jet"... jets are inside the carb
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The main reason for the vibration was the muffler touching the chassi. The muffler applied was a SITO 5200.
The man in the workshop just bend it a bit and reduced a lot the vibration.
It's not perfect but it's better, when I have more time I will look closely how it's mounted and if it's need to adapt better the bracket.
The Vespa runs very well, there is only a annoying (a little bit less) vibration.
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