Vespa p125x. Premix
150 2nd oversize cylinder
Sip road 2
Heart drilled air filter.
20mm standard carb with a 102 jet.
After a nice 15 mile easy run, i got on a 60mph road, wot got to 50ish,
Engine died, rear locked up. Pulled clutch and stopped.
Kicked it oved started first time and ran smooth, i did not try wot again.
Had a look at plug. A nice pale chocolate colour, guides say its good.
Im not mechanically inclined or and dont know may abbreviations, sorry.
I guess this topic has been chatted about, again sorry if it has.