engine goes putt putt when I release the throttle  By  arielb1 (Read 492 times)

Thank you Joaeu, the manual is a bit confusing. The problem goes away if I set the idling speed adjustment screw to 2000 RPM with the engine at normal operating temperature. If I set it any lower than this I get the chugging sound as if the engine is about to die or does eventually die as it returns to idle

Is the idle suppose to be 2000 RPM for idle with engine warm? Thank you all for your assistance. There is another section in the manual that states 1600, but this will give me issues with chugging.

Thank you in advanced

I think you're running it a little lean.
I ride a 150cc Lance Venice, it's a 10" donut in retro style (aka BMS Romans, SSR Metro).
When my scoot was running a little lean, I had to keep the idle at 1800-2100 RPM.
Also, when it was running lean, when running at 50-75% throttle, I could feel at times the engine misfiring once or two.

I did swap carburetors, because I wanted to verify my backup one worked.
I did adjust the Air-Fuel Screw again because it was another carburetor.
I set the idle initially to 1440rpm, it has slowed down slowly down to 1280-1320, but sometimes it will also idle as low as 1200rpm.
All without stalling at all.

My scoot only stalled one time, when for some reason, after stopping at a stop light, its idle speed was down all the way to 1000rpm, and right after that I tried to top the throttle up a little bit..