These any good?? YX GPX

The Pitster Pros & the Piranhas got the best reviews when I looked into that whole scene, I just wound up buying the Piranha 140 because one website (T-Bolt, I think) said it was their bestselling motor. Hasn't let me down one bit, though I haven't really run it in properly on these rugged AZ trails. MotoDevo can probably tell ya more about the Pitster Pro motors, those boyz Down Under race minis & pit bikes BIG-TIME, their videos are amazing. Watching those videos makes me wish more people were into minis & pit bikes here in the White Mountains, where full-sized dirt bikes and quads are more popular because they're SAFER, LOL. Some of the ruts & rocks on these AZ trails are no joke, they're downright dangerous...

 

I bought a Pitster Pro 140 that lasted 4 miles. Sent it back, they lost the engine for 3 or 4 months and they sent it back with the same 3rd gear clicking... THANKS! I would just buy a Lifan on ebay. Screw Pitster Pro. Cecil agrees. I wasted 375, not the $549+ shipping your ad wants for it. My Lifan now has about 4000 miles on it.

 

Heard of issues with the yx and zonga gearboxes quite a few years back (sloppy tollerances) but nothing bad in the last few years. The yx140 is a decent motor these days. That being said, lifan 140s have always been rock solid, but the yx140 feels a little faster (can only go from seat of pants feel)
Though i rode a GPX125 back to back with a yx140 that made the 140 feel SO much slower. I don't know if anyone is importing/selling the gpx125 in the US, punches way above its weight and LOVES to rev, if i had $500aus to spare at the moment, I'd buy one of those

 

tboltuusa sells the pirahna 140...that's what I'd buy.