Recent content by Jonnie_S

I guess I got lucky by indiscriminately blowing air through the carb. But before doing that, I examined the parts very closely using an assembly microscope (I do electronics design/fab), and saw nothing. If there was something in there, it wasn't in the jets' orifices. Maybe something in the...

Thanks for the info. As I said in my previous post, after cleaning the carb a second time, the engine now runs perfectly smooth across the rpm range. The only thing I did differently the second time was to fish a 30g wire through all the orifices. I never saw any debris, but something must have...

Sounds like I'll stick with what I've got since at least I know its jetted properly for the engine. And I'll get a high quality fuel filter. Lots of great info -- thanks to all.

Thanks for the info shadetree! I've seen lots of generic or no-brand replacement carbs on ebay/amazon/repair-parts sites in the $50-$75 range. Are any of these likely to be better than the Nikki, in the case this carb makes a habit of failing from microscopic-sized particles?

Second time's a charm. Not a speck of dirt in the carb, but stuck a thin wire through every orifice and flushed out and blew everything. Re-assembled and its running perfectly smooth at low and high speeds. I guess there was something in there somewhere. Thanks PT for keeping me focused on...

At low idle, if I block off most of the air intake, the idle smoothes out completely, so most likely a fuel problem. I'll open up the carb again. -Thanks

B&S 40N877 engine is surging most noticably at idle and low speed, but even at high speed it does not sound right. Sounds a bit rough. Mower has less than 30 hours on it. 2 years old. New fuel filter, air filter, spark plugs (old ones looked fine) Fuel pump seems to work fine. I see fuel...