After start my Vespa GTS 250ie has lower idle, also start is slightly weak, tacho shows rpm at 3 bars. Later after about 20 sec rpm goes up to 4 bars and will stay at this rpm all the time also during ride when I stop and let it idle. Absollutely no problem with idle rpm during ride, newer goes lower or vary, just stays on 4bars. Also when I start and there is low ide, then pull throttle slightly, rpm goes up and then dow to 4bar on tacho.
When I start engine with even slightly pulled throttle, start is much better and idle rpms are immediately at 4bars. Please do you have any suggestion how to adjust idle for engine start?
BTW, there is new spark plug, battery, air filter.