Modern Vespa : et4 madness

et4 madness

Edwin

UTC

details

Member

2002 et4

Joined: UTC
Posts: 5
Location: Fort Worth, T.X.

Edwin

Member

2002 et4

Joined: UTC
Posts: 5
Location: Fort Worth, T.X.

UTC quote

So, my 2003 et4 was running poorly. Had to baby the throttle up to about twenty mph and then it would take off fine, no problems idling. I decided to remove the carb and clean out the jets. my low jet, idle jet, was clogged. once i put everything back together, and i did so properly, it would start and idle but i could not give it steady throttle. i had to twist the throttle in quick bursts to get it moving then hold it just above idle to maintain the speed. This is where it gets strange to me... I covered the main air intake, and now it accelerates quicker than ever, but once i hit about thirty mph it bogs down and won't speed up at all. If anyone has any ideas as to why this would happen i am all ears.

Cheers

mandy13 UTC details Member Joined: UTC Posts: 24
mandy13 Member Joined: UTC Posts: 24	UTC quote you may have an air leak some where. cover the air intake some more and observe what happens.

Harvey UTC details Ossessionato 2016 Honda NC750XD, 2007 GTS (sold), Joined: UTC Posts: 3517 Location: Canada
Harvey Ossessionato 2016 Honda NC750XD, 2007 GTS (sold), Joined: UTC Posts: 3517 Location: Canada	UTC quote Not sure about the air intake part, but did you replace the fuel line? They degrade with age, breaking off bits of rubber to re-clog your carb. Regards Harvey

OP Edwin UTC details Member 2002 et4 Joined: UTC Posts: 5 Location: Fort Worth, T.X.
OP Edwin Member 2002 et4 Joined: UTC Posts: 5 Location: Fort Worth, T.X.	UTC quote the air intake is completely closed up, so i must have a leak, but nothing in the air system was altered when i cleaned the carb and it did not seem to be affecting the performance at that point. will look into it though. as far as the fuel line i will have to check... want to say it was replaced about a year ago when i picked up the scoot. thank you both for your consideration.

michael_h

UTC

details

Moderator

2006 LX150 "Amadora"

Joined: UTC
Posts: 7131

michael_h

Moderator

2006 LX150 "Amadora"

Joined: UTC
Posts: 7131

UTC quote

Sounds a little similar to a problem I had a while ago.

michael_h wrote:

Today I took my LX150 out for a country ride. Was managing well at 90-100 kph (around 55-60 mph) when I suddenly lost power. The scooter would run at 20-30 kph, and anything faster would cause the engine to first speed up, then sputter, and then the scooter would start to lurch - all while remaining at the 20-30 kph.

On the roadside, I was able to check some things. Plenty of gas, and from a reputable station. Starts up immediately, and revs while on the centre stand. No obvious dislodged hoses, and the carb did not smell of excess gas. From a dead stop, it would pull away and speed up to 20-30 kph easily. Adding more throttle made the engine sound like it was revving faster, and the sputtering and lurching would then begin. it seemed quite content to putt along at 20kph as long as I didn't add more throttle.

It is all contained in this topic
Loss of power - need help diagnosing problem (SOLVED)

OP Edwin UTC details Member 2002 et4 Joined: UTC Posts: 5 Location: Fort Worth, T.X.
OP Edwin Member 2002 et4 Joined: UTC Posts: 5 Location: Fort Worth, T.X.	UTC quote Thank you Michael, since i have been cleaning up the carb i might have some floaters. will check that first. probably a good idea to run new fuel line and replace filter as well. again and again, thank you.

pdxvespa UTC details Modératrice 2005 Cobalt Blue ET4 Joined: UTC Posts: 6952 Location: Portland, OR
pdxvespa Modératrice 2005 Cobalt Blue ET4 Joined: UTC Posts: 6952 Location: Portland, OR	UTC quote Edwin, let us know how things go! --Deborah

Edwin

UTC

details

Member

2002 et4

Joined: UTC
Posts: 5
Location: Fort Worth, T.X.

Edwin

Member

2002 et4

Joined: UTC
Posts: 5
Location: Fort Worth, T.X.

UTC quote

problem solved

as it turns out i have a leak in my air box. several of the screws that hold the cover on the air filter we stripped and some were just plain missing. duct taped it just to get around for now, vespa dealer is only a couple of miles away so it will be easy for me to get new parts.

Thanks to all for the help.

p.s. if you are in or around the Dallas/Fort Worth area, the dealership on University and Lancaster in Fort Worth employs a wonderful mechanic named Robbie. Very knowledgeable and sweet as cupcake.

Cheers,

Positive

pdxvespa

UTC

details

Modératrice

2005 Cobalt Blue ET4

Joined: UTC
Posts: 6952
Location: Portland, OR

pdxvespa

Modératrice

2005 Cobalt Blue ET4

Joined: UTC
Posts: 6952
Location: Portland, OR

UTC quote

Re: problem solved

Edwin wrote:

Great-- glad to hear you've got a solution.

And thanks very much for posting props for your mechanic. Very helpful-- Does he make long distance house calls?

--Deborah

Post Reply

Modern Vespa is the premier site for modern Vespa and Piaggio scooters. Vespa GTS300, GTS250, GTV, GT200, LX150, LXS, ET4, ET2, MP3, Fuoco, Elettrica and more.

Shop on Amazon with Modern Vespa

Modern Vespa is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com

[ Time: 0.0139s ][ Queries: 4 (0.0055s) ][ live ][ 313 ][ ThingOne ]