Hello everybody,
I took advantage of this afternoon's sun to go out for a ride.
Strange thing has happened after about 10 km of trip: I slowed down at a stop sign and the engine... got stopped. Tried various times to kick to re-start but nothing happened. At the end, I tried to kick after pushing the "hot start" white knurl on the carb's body (never used before as I remember!...) and finally the engine started.
I decided to go back home, and when I slowed down at crossroads, roundabouts etc. the engine's RPMs slowed so down that I had to keep on turning the handgrip to prevent the engine from turning off. (Once at home, I noticed that the white knurl had reset itself during back trip.)
When at home, I decided to inquire into the problem's cause. I tried to adjust the Leerlauf - Regulierschraube: until that moment it was set to standard 1 - 7/8 turns out, but then I found that the engine started and kept running at idle only if I get the Schraube fully screwed in! (With white knurl in OFF position, obviously.) If I tried to unscrew the Schraube little by little, RPMs slowed down to finally stop near standard 1 - 7/8 turns out.
I tried to unscrew the Zündkerze too to see its colour (also if I think that it's not so relevant because of the many regulations): extremely black and sooty.
I say first of all that during last days' rides nothing like this happened.
I'm currently running with stock muffler, stock paper Luftfilter and NGK BP7ES.
My Vergaser is the stock VM34SS, but without accelerator pump: all Düsen, Nadel, Schraube etc. that are installed were bought as a Rebuild-Kit from Kedo.
What could have happen?
Grüßen
Simone