20 Most Recent 2005 Vespa ET4 125 Questions & Answers



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first: you better not open the engine by yourself. the chance to worsen the condition is higher than the probable benefit if you are not a skilled Vespa mechanic....it's NOT a snap, rather a major overhaul...- then I like to know: why do you think you actually need to adjust the valve timing? Valve Adjustment on Vespa Sprint 150 3V

2005 Vespa ET4... | Answered on Nov 21, 2018


The Vespa ET4 has fuses on 3 different locations....
1) under the cover on the front shield
2) besides the battery under the seat
3) under the helmet box
under front shiel cover:
fuse-box-vespa-et4-sxbikrkt5iu1vmjxkjitshw2-5-0.jpg
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2005 Vespa ET4... | Answered on Nov 29, 2014


the Vespa ET4 has fuses on 3 different locations....
1) under the cover on the front shield
2) besides the battery under the seat
3) under the helmet box
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2005 Vespa ET4... | Answered on Nov 26, 2014


you should change the roll bearings in the variator box not only the belt! -the complete servicekit (see pic 3)
https://m.youtube.com/watch?v=zPX_xWPt0Ck 78635511-dc64-4816-8c52-cb982c0c147e.jpg 149cf14c-7282-48e4-a458-3905520aa398.jpg eef7a64f-c5b8-41bd-a471-6c0c6e860d85.jpg

2005 Vespa ET4... | Answered on Sep 28, 2014


if its back firing probably needs inlet valves setting, if it dont then more likely floats on carberretas need looking at...

2005 Vespa ET4... | Answered on Feb 16, 2013


Hi.
did you get the solution for your problem with the fuel gauge? I have the same problem and cant find, and fix the problem..

2005 Vespa ET4... | Answered on May 28, 2012


Hi, Unionjak if you have changed your engine size, compression ratio, fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve, and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water, etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. Your engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" you're not getting enough fuel.
1. Close to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide-open throttle is managed by the main jet and air jet.
6. A wide-open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, the engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark grey, the engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
For more information about your issue and valuable "FREE" downloads that you will need for viewing and printing please click on the blue links below. Good luck and have a wonderful day.
http://modernvespa.com/forum/topic75894
https://www.youtube.com/watch?v=QlXTE2bLWMI
https://www.manualslib.com/manual/825253/Vespa-Gt-125.html
https://www.oemmotorparts.com/oem2.asp?M=vespa
https://www.manualslib.com/manual/867725/Vespa-Gts-125.html

Vespa... | Answered on Nov 15, 2019


Hi, Anonymous and Jim for this scenario you will need your service manual, parts fiche, and owners manual if you can't find the best tool you ever bought for your Kymco, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
http://modernvespa.com/forum/topic54217
https://www.youtube.com/watch?v=85_u6xw0i7k
Free Piaggio and Vespa Motorcycle Service Manuals for download
https://www.oemmotorparts.com/oem2.asp?M=vespa
VESPA 150 Operation And Maintenance

Vespa... | Answered on Jul 10, 2019


Hi, Craig and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. A faulty ignition coil or electronic control module.
7. Faulty pulse coil.
8. Faulty CKP, CMP, or BAS sensor.
9. Faulty ignition switch.
10. Faulty run/off switch
11. Tilt sensor needs a reset.
12. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
http://modernvespa.com/forum/topic14557
https://advrider.com/f/threads/need-help-with-1980-vespa-p200e-with-electrical-problems-socal.1134860
https://www.manualslib.com/manual/998362/Piaggio-Vespa-P125x.html#product-Vespa%20P200E
https://www.sip-scootershop.com/scooter/VESPA%20P200E++PX200+E%20200ccm-0079
https://www.manualslib.com/manual/808659/Piaggio-Vespa-P125x.html#product-Vespa%20P200E

Vespa... | Answered on Jun 01, 2019


check under the seat where the luggage compartment storage is

Vespa... | Answered on Apr 25, 2019


That is great price for the 2008.......The money You will save, by buying the 2008 will easily cover any problems that may arise......Vespas have a very high resale value.....I recommend an authorized Vespa dealer to perform any and all sevices to maintain the resale value.........

Vespa... | Answered on Apr 20, 2019


Hi, Brian for this scenario you will need your service manual, parts fiche, and owners manual if you can't find the best tool you ever bought for your Vespa, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
http://modernvespa.com/forum/topic18213
https://www.youtube.com/watch?v=qq-SbBW4fl8
VESPA LX 50 Workshop Manual
https://www.oemmotorparts.com/oem4.asp?M=Vespa&T=LX%2050%204T&Y=.&L=LX-50-4T
Vespa LX 50 User Manual

Vespa... | Answered on Apr 19, 2019


Hi, R for this scenario you will need your service manual, parts fiche, and owners manual if you can't find the best tool you ever bought for your Vespa, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
https://www.google.com/search?q=Wiring+diagram+2002+Vespa+ET2+50&tbm=isch&source=univ&sa=X&ved=2ahUKEwi1u7TN6NrhAhXqzVkKHV7uAVUQsAR6BAgJEAE&biw=1440&bih=757
https://wz.rundumhund-aktiv.de/vespa-et2-wiring-diagram.html
Vespa ET2 ET4 Technical Manual
https://www.oemmotorparts.com/oem4.asp?M=Vespa&T=ET2%2050&Y=.&L=ET2-50
VESPA ET2 50 User Manual

Vespa... | Answered on Apr 18, 2019


Hi, Anonymous for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Modern Vespa Locked my keys in the 150 LX Seat
Two Ways to Unlatch the Seat Vespa GTS GT GTV
Modern Buddy locked my keys in my seat think

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Vespa... | Answered on Feb 12, 2019


The brake lever also activates the brake light, their may be a break or short in that wire ( easiest check) and second guess would be the wire which activates the starter,

Vespa... | Answered on Jan 20, 2019


- first: get some starter spray and spray some in the air inlet at the air filter - then IMMEDIATELY start it. may need several trials.
- second: push the Vespa in neutral some meters until you reach a certain speed and then switch from neutral to the first or second gear - then push further with some speed until it fires up the engine.
you can do it best on a flat road or even better downhill....



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Vespa... | Answered on Nov 21, 2018


The float pushes a needle that then stops the fuel flow make sure its not the needle thats sticking or what ever pushes on the needle is not sticking ! But if you are sure it is the float that is sticking a fine sand paper (320 ) can be used around the sides of the float to smooth down any rough bits .

Vespa... | Answered on Apr 25, 2018

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