Kawasaki TJ35 Bogg Down Issue What Could It Be.?!

Here we have a Kawasaki TJ35 with issues.
Few tips & tricks on what to look out on.

[@adelinozamuner9087]

Good morning: I am from Treviso - Italy, passionate about small engines, and I recently discovered your

site, where you offer some interesting videos. I am writing to you so that you, please, with your

experience, could help me understand a carburetion problem for my brush cutters.

I have two Kawasaki brush cutters of the TJ series, 35 and 27 cc., which have Walbro mod,

wya 39 carburetors, with a central idle adjustment screw, and a rotating cylindrical

valve, and they do not have any adjustment for the maximum. I find myself in this situation:

not trusting the 2% mixture, I did a test, and also at 2.5%. and also at 3%.

1) 2%: the engine runs very well, it does not smoke, it rises well, but when I examine the spark plug I

find it very clean, dry and very white in color: if I am not mistaken, very lean.

2) 2.5%: the engine is a little slower, it smokes at idle only until it is no longer

warm. Note that in the medium-high revs, it runs four-stroke, and returns to normal at maximum.

The examination of the spark plug reveals a little carbon deposit on the crown, while the

porcelain is medium gray: it seems to be richer.

3) 3%: the engine is ready, it is very linear in delivery, it does not smoke on any

occasion. The examination of the spark plug indicates a clean situation, with the

porcelain gray: could it be a slightly lean situation?

I beg you, then, to receive advice from you, if you consider my procedure valid,

or other procedures to be able to have optimal carburetion. I can think,

that drastically change the carburetor with an adjustable one. I defer to you.

Thank you for your attention and interest

Kind regards

Adelino Zamuner

[@mossdeeify]

Wait did you just say bula?

[@NOOBMANCODMYT]

Engine sound still not good