Hi everybody

In the meantime, I managed to solve this problem completely. After having plaid around with the engine settings for a very long time without any success (I even sent in the engine once for repair), I finally started from scratch removing all things which were not absolutely required to run the engine: cowl, my tank-filling system and - the Hatori pipe. With the original muffler, the YS110 ran perfectly! The installed pipe was the Hatori 674. That pipe does obviously not have a large enough crossection. Now my pipe is the 692. It took me 5 minutes to readjust the setting, and now the engine simply runs great. Perfect in idle and in full throttle, very good transition.

The original pipe 674 was unfortunately recommended by my distributor, however turned out not to be suitable for this engine. The pipe 692 provides a larger crosssection and less dynamic pressure. This seems to be very important for this engine in idle conditions, but you won¨t notice any difference in max throttle.

Pascal