I'm wondering if anyone can explain why a px150 and a px 125 have a different stroke 58mm and 57mm
I have bought a box of ebay bits and in it was a barrel which has the same port layout as a px 150 but its bore is about(hard to measure with a tape!)60mm and is definitly much bigger than a px150 barrel i have(57mm)
I presume its a px150 barrel thats been bored out and i wondered if i managed to get a piston would this mystery barrel fit on my px125 engine
Then i discovered the different strokes between the two models and wondered "how can that be" as they have the same crank and i believe the stroke is twice the con rod length.
Yet a 125 and 150 barrel are interchageable- confused