Hi all, I'm repairing an early series 1 Li125 fitted with a Filso four pole ignition, BS5 carb, and Filso coil. It came to me as a non-runner and looks like it's a newish restoration that has been jet washed or steam cleaned and then stored for a long time as there are white water chalk marks all over the nuts and bolts and electrical connections. Once I ditched the carb due to the usual flooding issues and fitted an SH1/18 with correct jets for a Li125, and changed the fuel for fresh it ran up sweet as a nut. Only problem is it won't rev. When the throttle is opened the revs try to increase but it just bogs down and won't rev up. Release the throttle again and it settles down into a nice even tickover.
I suspected a dirty carb, so cleaned it all out again, but no joy. There are no air leaks either. A dodgy condenser was the next possible so I changed it for a new one, but to no avail, exactly as before. I've got spare points, flywheels, stators and regulator boxes, but have tried cleaning up all the earthing points first, most of which were painted over. All now cleaned but still as before. Any idea's as to the next move please anyone?