Hi Guys,
I'm new to the forum, although I have been popping on here for the last few years and it has always been a massive help!
My PX 125 broke down yesterday after a run of about 30 miles. I fitted a Simonini exhaust and up-jetted the carb to a 100 a few days ago and it had been running fine. After about 30 miles of doing 30mph I opened it up to 50 and it lost power and cut out. I have checked the plug and it is sparking fine, it's a good colour so it shouldn't have been running to lean. Prior to this I have had trouble getting it started, but closing the fuel tap when left standing seemed to rectify this. I has also had a slight issue with lurching when trying to hold a consistent speed, could this be a fuel line issue, or maybe flooding?
I am also aware there could be some damage to the piston and cylinder barrel as the compression seems to be poor and it won't kick over at all now.
Although this is my second PX (first one was stolen!) my mechanical knowledge isn't the best, and the thought of doing any work on the barrel and piston is a bit daunting!
Anyway any help of advice would be greatly appreciated.
Cheers,
Tim.