PX150 for a newer scooter owner, a good choice?
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Member
2007 Stella 150
Joined: 02 Nov 2019
Posts: 21
Location: Rochester, Minnesota
Sun Nov 03, 2019 5:51 pm quote
I'm a newer scooter owner, I bought a 2004 Chinese scooter with a two stroke 50cc minarelli motor. I replaced the exhaust with an expansion chamber, then put in a 70cc BBK, replaced the carburetor and adjusted the main jet. Working on tuning the new Malossi variator I installed, and dialing in the carburetor. My 0-35 times have gone from 13 seconds to as low as 5.90 seconds, usually around 8.0 seconds. Need to dial the variator in better. I can now reach 50 mph using a gps. Cooler weather is slowing me down at the moment.

I came across a 2005 PX150 Vespa with about 5000 miles, runs needs minor work from what I can tell. Thinking this could be fun to ride and tinker on next spring, looks to be a two stroke from what I have read. Anything I should be looking for mechanically that is a common issue? I can see some oil on the right side on the case by the rear tire in pictures. Going to go look at it in person.

Would this be a good scooter to ride a county road at 55-60mph? I see upper end 177cc kits, are they about the same work as a minarelli top end to replace? From what I have read it looks like a good performance gain. Guessing I would do exhaust, then bbk, then carburetor. Also saw a few sports kits that were all inclusive that looked interesting, and less work than mixing and matching.

I have a full size 2017 Indian Chieftain that I use for any longer rides. Might use the Deal a to ride at 55-60mph and ride it 10 miles to work on a two lane county road.
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
Sun Nov 03, 2019 7:12 pm quote
If you have the money and time sure! A PX is a great second scooter and coming from a big bike, youíll have fun with the hand shifter.

Youíve got the right idea for upgrades. Depending on your budget Iíd say start with an exhaust swap, main jet swap and switch to a 21 tooth clutch right off the bat. If you still want more, then you can look into adding a kit and porting the engine cases to match it.

Itíll be good enough for 55-60 and with a good sweep through the scooter first time, youíll eliminate any gremlins for a very long time. No real common problems with PXís.

Any more questions? Ask here. The General side of the forum is pretty limited as far as anything mechanical goes. Thereís very few that wrench, even fewer that tune and fewer that do electrical work.
Member
2007 Stella 150
Joined: 02 Nov 2019
Posts: 21
Location: Rochester, Minnesota
Mon Nov 04, 2019 4:34 am quote
I agree with you on exhaust first from my experience, up jetting the main to keep everything happy. Did a little reading about a 21 tooth clutch basket and understand that now, sounds easy enough also.

Drilling out a few holes on the air filter looks interesting if it helps.

Out of pure curiosity at this point, any references on case work? Is it a requirement for a middle level or sport kit? If case matching isnít performed, any guess on the amount of performance being left on the table?
Molto Verboso
One or two fun scoots....nothing too precious
Joined: 17 Jul 2013
Posts: 1216
Location: UK (South East)
Mon Nov 04, 2019 5:36 am quote
European PX150 bikes from 2005 and beyond already have a 21T clutch. Both of mine did from the factory. That said, the USA spec may have been 20T like a Euro PX125. If you can make sufficient power/torque with exhaust and jetting mods, then a 22T clutch would be the step up, assuming the above is true, but in my experience the 150 motor needs a kit of some type!
Molto Verboso
Joined: 26 Oct 2015
Posts: 1825

Mon Nov 04, 2019 6:37 am quote
The stop speed of a stock 2005 PX150 is going to be around 47mph on the GPS, which means that your existing Chinese scooter is faster. There are only two ways to get it to go 55-60 mph. Either find a really steep down hill, or get install a cylinder kit. If you try installing a larger tooth clutch on a stock '05 PX150, it's just going to make it slower. If you decide to install a bunch of go fast parts on it, be prepared to spend a fair amount of money. You will probably also have a thread here on the forum that will also be around 10 pages long. If you just install an aftermarket box exhaust, it will get you closer to about 53mph for a top speed. If you strip down the cases and flow and match the ports in the stock cylinder to the engine case, as well as the carb to the case, you should be able to cruise at a true 55mph. Keep in mind that "top speed" isn't too helpful on a scooter. A "cruising speed" is what you want. Top speed usually only happens when all conditions are right...such as cooler weather, tailwind both directions, slight downhill, weighing less than 150lbs, ect...

I would argue that the '05 PX150 is (and always will be) the most reliable shifting scooter that has ever been introduced to the US. I've had 4 of them. Zero problems with any of them.
Addicted
63 Lambretta LI 125 series 3, 71 Sprint Veloce , 2005 Vespa PX150, 1979 P200E
Joined: 04 Jul 2011
Posts: 833
Location: Tucson, AZ
Mon Nov 04, 2019 11:37 am quote
Owning a 2005 PX150 is always a win-win situation.I recommend that you get it, you wouldn't regret.
Hooked
PX 150
Joined: 06 Aug 2007
Posts: 325
Location: Dublin, Ohio
Mon Nov 04, 2019 12:18 pm quote
whodatschrome wrote:
The stop speed of a stock 2005 PX150 is going to be around 47mph on the GPS, which means that your existing Chinese scooter is faster. There are only two ways to get it to go 55-60 mph. Either find a really steep down hill, or get install a cylinder kit. If you try installing a larger tooth clutch on a stock '05 PX150, it's just going to make it slower. If you decide to install a bunch of go fast parts on it, be prepared to spend a fair amount of money. You will probably also have a thread here on the forum that will also be around 10 pages long. If you just install an aftermarket box exhaust, it will get you closer to about 53mph for a top speed. If you strip down the cases and flow and match the ports in the stock cylinder to the engine case, as well as the carb to the case, you should be able to cruise at a true 55mph. Keep in mind that "top speed" isn't too helpful on a scooter. A "cruising speed" is what you want. Top speed usually only happens when all conditions are right...such as cooler weather, tailwind both directions, slight downhill, weighing less than 150lbs, ect...

I would argue that the '05 PX150 is (and always will be) the most reliable shifting scooter that has ever been introduced to the US. I've had 4 of them. Zero problems with any of them.
I bought a 2005 PX150 with no miles on it earlier this year and have ridden it about 2500 miles. The above post I have quoted is 100% on the money. I like the scooter a lot, but cruising at 55 to 60 is not going to happen without a lot of work.
Molto Verboso
1980 P200E project, 2005 Stella Mal 177 MKIII in pieces
Joined: 20 Jul 2018
Posts: 1128
Location: Staten Island, NY
Mon Nov 04, 2019 1:30 pm quote
Lots of work and a decent chunk of money.. that probably will grow with your mistakes. As long as you are looking for that type of experience DIY mechanic and spending time learning, it is well worth it. Other people spend their money on alcohol and drugs. I spend mine on this! Or you can just enjoy riding it as is and not worry about any of that other stuff.
Veni, Vidi, Posti
74 50s x3 78 P200 84 Cosa 58 AllState 68 Sprint 80 50special + projects
Joined: 22 Nov 2010
Posts: 7339
Location: seattle/athens
Mon Nov 04, 2019 5:45 pm quote
PX200, holy grail
Another way to go faster rather easily and probably more reliably is to just enjoy your 150 for now, maybe get a cheap knockoff pipe like this & an upjet AFTER you've put some miles o n it so you know where you're starting. Get it well tuned by doing all the basic stuff, check timing, plug color etc and do all the basic maintenance too for a safe and reliable ride out of the gate. Maybe a n easy to do carb clean/rebuild if it seems messy. Now consider something like this if you want and remember, be sure to go up w/ your main jet or maybe seize.

a big box knock off for $109 : http://www.scootermercato.com/Scooter-Parts/Exhaust/SR-Pipe-150

But now you also lay in the weeds and grab a Rally or P 200 big motor when you can, probably won't be cheap. That will get you there nicely with some carb and airbox matching, fiddling around with the inlet port and sorting the squish. Plus two or three other simple things(like drilling the air filter "heart" out) that I'm likely forgetting, but others here won't if you choose this route. It's only the most desirable newer model and generally not even available here.



Here's a rare PX200 for sale, pretty nice one too but for $5995 : For Sale (So. Cal.) Vespa PX200 Electric Start Disc
Lurker
'99 PX200; '02 ET2
Joined: 02 May 2008
Posts: 3
Location: Houston, Texas
Tue Nov 05, 2019 10:40 am quote
Great scooter, with a 24mm carb and a JL pipe you will get 55mph all day long.
Molto Verboso
Joined: 26 Oct 2015
Posts: 1825

Tue Nov 05, 2019 3:08 pm quote
I agree that a JL will get it going 55mph, but I donít think that the stock cylinder will work with it well enough to go 55mph all day (or even a half day). I believe itís the wrong pipe for the application. I also donít think that the porting is even large enough to warrant a 24/24 on a stock PX150...even with a JL.
Member
2007 Stella 150
Joined: 02 Nov 2019
Posts: 21
Location: Rochester, Minnesota
Tue Nov 05, 2019 5:03 pm quote
From what I'm reading here, I think I'd be going with an exhaust that would work later with a 177 cylinder setup. Get that main jet sorted out, see how it works for my use. Meanwhile pull the clutch and see what it has for a gear.

If I'm not happy then I can go to a 177cc and get that running. Then go to the larger factory px200 carburetor, and get that running. I would really like to pick an exhaust, carburetor and cylinder that people are using and have previous jetting dialed in pretty close to save myself a huge headache and non running scooter. I see SIP offers a 177 Polini sport kit with common parts.
Hooked
2001 LML 150
Joined: 16 Jul 2017
Posts: 324
Location: Melb, Aus
Tue Nov 05, 2019 6:16 pm quote
Don't forget to smell the roses along the way.. these things are beautiful to ride even at 45 miles an hour.

Enjoy.
Molto Verboso
Joined: 26 Oct 2015
Posts: 1825

Tue Nov 05, 2019 8:45 pm quote
Philos wrote:
Don't forget to smell the roses along the way.. these things are beautiful to ride even at 45 miles an hour.

Enjoy.
I ended up doing just that on a long trip! I was on my P200 and my friend was on his Ď05 PX150 (with a Sito+). We ended up averaging around 45mph for our whole 1300 mile trip. The first day alone we rode just over 500 miles! It was the most relaxing rides ever. I never had to wind out my scooter to keep up with his 150, so I just putted along side him. He pretty much had the throttle pinned the hole time just to keep his scoot at 45mph. One of the crazier things though, was that we were riding down some super long (probably 5 miles of steep downhill) mountain pass, and both of our Garmin GPSís clocked his stock PX150 at 71MPH!!!...yes, the mountain was that steep! He weighed in at about 230lbs, with another 70lbs of camping gear strapped on the poor scooter. Gravity and momentum was on his side that day! Iím sure those speeds will never be duplicated on a stock 150 again!
Member
2007 Stella 150
Joined: 02 Nov 2019
Posts: 21
Location: Rochester, Minnesota
Sat Nov 09, 2019 6:15 pm quote
If I buy a 2006 Stella with a BBK and pipe will I be shunned? Owner says it will do an indicated 70mph. Has an upgraded crankshaft and cases.
Molto Verboso
Joined: 26 Oct 2015
Posts: 1825

Sat Nov 09, 2019 6:31 pm quote
Christopher_55934 wrote:
If I buy a 2006 Stella with a BBK and pipe will I be shunned? Owner says it will do an indicated 70mph. Has an upgraded crankshaft and cases.
A PX150 will have a higher build quality and much better reliability than a Stella, but Stella's are cool scooters too. Keep in mind an indicated 70mph might only be 55-60mph on the GPS. And that indicated 70mph might only be going down a hill...with a tailwind, not on a flat. We scooterists' tend to embellish just how fast our scooters can actually go. Get a GPS and verify the sellers claims. The get him to hold it at 70mph (on the GPS) for a full 2 minutes to see if the engine doesn't seize up.
Member
2007 Stella 150
Joined: 02 Nov 2019
Posts: 21
Location: Rochester, Minnesota
Sat Nov 09, 2019 6:44 pm quote
The high temperature is 25*F. I donít think Iíll be riding that far well
see. Iím taking my full face helmet.
Molto Verboso
Joined: 26 Oct 2015
Posts: 1825

Sat Nov 09, 2019 7:25 pm quote
Christopher_55934 wrote:
The high temperature is 25*F. I donít think Iíll be riding that far well
see. Iím taking my full face helmet.
Having a full expansion chamber on a stock cylinder will usually take away all the low end torque, there by making the scooter even slower (gutless) than stock at lower RPMs. Since it will be so cold out for a test ride, i guess it really won't matter to you since you probably won't be going over about 35mph.
Molto Verboso
1980 P200E project, 2005 Stella Mal 177 MKIII in pieces
Joined: 20 Jul 2018
Posts: 1128
Location: Staten Island, NY
Sat Nov 09, 2019 7:32 pm quote
I can't see it getting more than 60-65mph GPS. I got 55-58 and just barely 60 occasionally with stock Stella and sip road xl exhaust. Pnp 166 kit stock crank same pipe for 65-68mph.
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