Low power at startup.
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Member
LX 50
Joined: 07 Jan 2020
Posts: 6
Location: Queens
Sat Jan 11, 2020 8:36 pm quote
Hi Guys,

Recently purchased a used a 2007 Vespa LX 50 with 2,500 miles. I had the carburetor cleaned, changed the fuel & vacuum lines and new batter. From a cold startup, the may turn off on first initial throttle and afterwards on the first couple of seconds, it struggles with power but after itís warmed up the issues go away. Could it be the carburetor jet dirty or a spark plug? Any help is appreciated!!!

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Member
LX 50
Joined: 07 Jan 2020
Posts: 6
Location: Queens
Sat Jan 11, 2020 8:37 pm quote
darwinsm81 wrote:
Hi Guys,

Recently purchased a used a 2007 Vespa LX 50 with 2,500 miles. I had the carburetor cleaned, changed the fuel & vacuum lines and new batter. From a cold startup, the may turn off on first initial throttle and afterwards on the first couple of seconds, it struggles with power but after itís warmed up the issues go away. Could it be the carburetor jet dirty or a spark plug? Any help is appreciated!!!


72438D88-99FD-4293-861E-B926728B9876.jpeg

Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 251
Location: California
Mon Jan 13, 2020 4:19 pm quote
I don't have any experience with the LX, but this sounds like a choke issue to me.
Addicted
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 776
Location: Toronto
Mon Jan 13, 2020 4:53 pm quote
How long are you letting it warm up before you give throttle? This time of year (freezing temps), my LX carbureted needs a couple min warm up before she's willing to go anywhere. If I try before then, it's bogging and / or stalling.
Member
LX 50
Joined: 07 Jan 2020
Posts: 6
Location: Queens
Mon Jan 13, 2020 5:19 pm quote
berto wrote:
How long are you letting it warm up before you give throttle? This time of year (freezing temps), my LX carbureted needs a couple min warm up before she's willing to go anywhere. If I try before then, it's bogging and / or stalling.
Thanks for the reply, I just got the moped so certain things are new to me. I would startup the moped and hit the throttle right away and it would die. So I would try again but this time, I would hit the throttle several times rapidly and it turns on but struggles with speed - 1 minute into ride. After riding for a couple of minutes, the problem does go away and am able to turn it off and on again with no issues - 10-15 minutes in. The only thing i do notice is that the light of the panels light goes a bit down but not to the point that the moped shuts off on me. Tonight, I am going to change the spark plug as it seems the previous owner did not kept service the moped properly and rather just to change the part.
Member
LX 50
Joined: 07 Jan 2020
Posts: 6
Location: Queens
Mon Jan 13, 2020 5:22 pm quote
AnnDee4444 wrote:
I don't have any experience with the LX, but this sounds like a choke issue to me.
I am going to let it warm up before throttling and see if i get the issue. I am hoping its not the choke. Thanks!
Member
LX 50
Joined: 07 Jan 2020
Posts: 6
Location: Queens
Thu Jan 16, 2020 8:35 pm quote
berto wrote:
How long are you letting it warm up before you give throttle? This time of year (freezing temps), my LX carbureted needs a couple min warm up before she's willing to go anywhere. If I try before then, it's bogging and / or stalling.
Just an update, i changed the spark plug and changed the oil which looked like thick chocolate! It definitely runs with less vibrations but as I stated before, still low power from a cold start but 5 minutes into the ride itís normal. Do you usually warm it up for several minutes before going on the ride? [img][/img]

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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: 3348
Location: Oceanside/ SF
Thu Jan 16, 2020 11:53 pm quote
Sounds like a valve adjustment is needed. Usually the exhaust valve gets out of spec first. If it never got better Iíd say carb but the fact that it runs better and restarts easier once warm would make me lean towards valves.
Member
LX 50
Joined: 07 Jan 2020
Posts: 6
Location: Queens
Sat Jan 18, 2020 2:57 am quote
MJRally wrote:
Sounds like a valve adjustment is needed. Usually the exhaust valve gets out of spec first. If it never got better Iíd say carb but the fact that it runs better and restarts easier once warm would make me lean towards valves.
Hereís a video of what usually happens - at 58 seconds in is the issue that I am having. Within the first couple of minutes, the idling would not be consistent at a stop. Sometimes it would go low enough that it would shut off. Carb is clean, new oil, spark plug, fuel and air lines. The fuel tap work and I dont think itís a air leak as am able to go normal. I havenít checked the secondary filter and itís been cold weather for the past weeks but Iíve been riding it every day. Someone had mentioned the choke cable could be the culprit.
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