I've got a 1975 KR51/1 which is a very rare sight over here and gets more attention than my liquid-cooled 221cc Vespa when I ride it to scooter rallies!
However, when it gets warm, the engine starts to lose power and cut out.
This normally happens when I stop in traffic, but it has also started to die while riding along.
I've checked and changed the plug, and I guess the spark plug cap and HT lead are next, but after that.......?
I had changed the carburetor recently but re-fitted the original one because I could not get it to idle with the new one on, and the engine is completely standard as far as I know.
Any help would be greatly appreciated, thanks.