I own a scooter which I blew the engine in Dec 2016. I since replaced the defective parts in it and it now runs great aside of one thing:
Bottom end of the throttle is slugish (I'll elaborate)
It appears that I'm running fine on Idling and top end but between 25%-50% throttle the response is not good, it bogs down.
This is really obvious if I reduce my throttle to that range from having it full throttle.
Another one is when I accelerate, it goes up then slightly down until it picks up more speed then goes high again.
After I changed the parts, I noticed that I was running way too rich on Iddle and mid, so I changed my pilot jet, which fixed the iddle but it was still doing what it currently does on the bottom end of the throttle. I lowered the needle to the lowest position. I do notice that if I have more oil in my gas it seems to run better (I'm assuming here that I must be too rich still?)
I do have some dark sludge coming out of my exhaust pipe and it does smell rather bad (smells more than when it was a 50cc)
I was hoping for some advice on that.