Hello,

I know that there are a few similar problems but I wasn't able to solve it.

I got an overfuel on cylinder 3 then checked and replaced TDC sensor. Verified gap on the four plot. Between 0.6 and 1mm.
Now I have an overfuel on cylinder 1 and 2, fuel is basicaly unburned the spark is full of fuel. Cylinder 3 and 4 make spark plug totaly black so overfuel also.

The spark cable, spark plug, and so is new.

If I run the yb N/A everything is ok. Smooth running, idle stable, no problem to rev. But as soon as I put all the air hoses back. The idle is not that good, rev is almost impossible, alot of backfire.

Anyone here have got thoses problems and can give me a hint ?


Overfuel problems from right to left cylinder 1 to 4

Here is a quick video of the engine running:
Thanks!