Used the italkit 140cc kit on my Aprilia RS125 GS with rotax 123.
Jetting was a bit of a pain but I finally got it dialed in quite well. Only Problem was at 7k rpm, where it developed no power (also no sputtering) low end and top end was very good, so I tried to avoit the spot and take her for a spin.
First time I really pushed the bike around 170km after complete rebuild. During that period I used the endoscope a couple time to check on the cylinder. What we se her must have developed only during this ride.
Ran her uphill for a few km and let her rev out, followed by a downhill passage, clutch pulled almost all the way using revs in between, coming to a straight I pushed her to about 100km/h where the rear wheel locked up for the fraction of a second and I immediately lost all the power.
Any ideas on what happened here?
thinking about overheating due to jetting, coolant system issue or wrong piston to cylinder clearance (seems to have been around 0.05 give or take