204412-0163-e1

[Scrubcadet10]

Okay, here's the new plug with about 8 minutes of run time , electrode is getting some white building on it.

 

[Scrubcadet10]

 

[Scrubcadet10]

And here's the EPA sticker showing the engine is for intermediate use in California.

 

[Scrubcadet10]

 

[Scrubcadet10]

Okay, took the carb off, cleaned it again real good. Fired it up, ran it for 10 minutes and the muffler, woops, Muffkin, didn't glow at all.

 

[bertsmobile1]

That looks too lean to me .
check it with a few more hours on it .
If it is a customers mower then put a service note that the engine seems to be running lean as per the Cal EPA regulations & needs to be inspected again in Y months.
If it then blows up your bum is covered
In my shop, the jets would have had a kiss from a tip cleaner ( file ) to open them up a touch.

 

[Born2Mow]

Your smallest jet in the carb is blocked. The small jet is used with starting, idle, and acceleration. When scuzz starts forming inside the fuel system, it's the smallest jet that ALWAYS gets blocked first.

It will never get unblocked by itself because the vacuum inside the carb isn't enough to do anything except lift fuel a few MM. Fuel conditioners and cleaners (like StarTron) will really help once you can see light through the jet, but the cleaners must be flowing through the jet in order to clean.

 

[Scrubcadet10]

Okay, took the carb off, cleaned it again real good. Fired it up, ran it for 10 minutes and the muffler, woops, Muffkin, didn't glow at all.