Recently picked up a conquest with the Kawasaki Fd620d. A few things are odd.
Symptoms:
Idles very low, but starts very well even in cold weather (-10ish?)
After initial startup, even if I let it warm up 3-5 minutes, it will want to die when I tough the throttle. I have to let it warm up a lot more than I should have to, before I can successfully use the throttle
Throttle is, not great. Sometimes it feels like everything is normal power wise for an instance and then quickly, it seems to struggle. From idle to throttle, it's like there's a spot where it has a lot of trouble, probably why it dies so easily when cold.
As I rev it up, it will stutter sometimes, and once in a while a decent puff of black smoke comes out.
What I checked:
Plugs look in good condition, they both have spark. I can't tell if it's weak or normal. Plug at back of engine is normal brownish, plug at front of engine is just black.
I re-gapped both plugs a bit more and I think that made the spark a bit stronger. I put them at 0.028 rather than the 0.024, so top of the range. They were initially at the bottom of the range. After this I had less of the big puffs of black smoke, but still quite hesitant.
Took apart carb, cleaned it all up with brake clean + compressed air. Everything looks good, it didn't look gunky from the get-go.
I put the mixture screw back in, then backed it out 1 1/4 turn.
My air filter area seems to have quite a bit of fuel. Is this normal?
I didn't spend any further time after that, still doesn't run great. Will have to go look at the spider nest of wires of course, but just wanted to put this out for the collective knowledge
Thanks in advance.