OP
UTC

Enthusiast
Vespa T5 251, Lambretta GP200
Joined: UTC
Posts: 74
Location: Leeds, England
 
Enthusiast
Vespa T5 251, Lambretta GP200
Joined: UTC
Posts: 74
Location: Leeds, England
UTC quote
Bit of a long one....
Mate bought a banger GT125. It would run great until up to temp then nothing until it cooled down again. I changed plug, HT lead+cap, coil and some other bits to still have the same prob.
Sent it to garage for diagnosis, they changed vacuum petcock and pump. Still the same so was advised to change stator, so a new one fitted.
Now it does not start at all.....will occasionally run for about 2 seconds.
I've had enough...I need help!!
Any ideas?
Thanks
@jkj-fz6 avatar
UTC

Ossessionato
BV400, Primavera 150, Yamaha Zuma 125
Joined: UTC
Posts: 4266
Location: Twin Cities, Minnesota
 
Ossessionato
@jkj-fz6 avatar
BV400, Primavera 150, Yamaha Zuma 125
Joined: UTC
Posts: 4266
Location: Twin Cities, Minnesota
UTC quote
Have the valves been adjusted?
@lottolearn avatar
UTC

Hooked
2019 Liberty 150
Joined: UTC
Posts: 280
Location: NEPA
 
Hooked
@lottolearn avatar
2019 Liberty 150
Joined: UTC
Posts: 280
Location: NEPA
UTC quote
You can start with the basics, pun. Pull the spark plug, is it wet with fuel or dry? Get a known good plug stick it in the boot, hold it against the head and spin the engine. Do you have spark, yes-focus on fuel, no-focus on ignition.

Let them know here which one is missing and someone with experience with your model, Elvis, will guide you in the right direction.
OP
UTC

Enthusiast
Vespa T5 251, Lambretta GP200
Joined: UTC
Posts: 74
Location: Leeds, England
 
Enthusiast
Vespa T5 251, Lambretta GP200
Joined: UTC
Posts: 74
Location: Leeds, England
UTC quote
Yes I set the valves as one of the first jobs. Took the carb off to check today and all seems OK. Sparks are good so I thought fuel starvation but that is good too. I is stumped.
Thanks
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