Nikki Carb Model 697722
I have a Briggs & Stratton 40H777-0243-E1 engine with a Nikki Carb Model 697722 that needed cleaning (ran erratically with low power). After doing the cleaning the engine starts and runs good for several minutes then starts to miss, with black smoke and then finally quits. After removing carb and looking into the heads I noticed that there was gas pooled inside the intake port. I can see no evidence of a problem with the needle valve and the seat in the carb that would be allowing it to overfill. Where can I find a parts breakdown, or diagram for this carb,? and does anyone have an idea what may be causing the problem?
I have:
cleaned carb, and fuel lines, found lots of junk in bowl and lines.
adjusted valves
coils have good spark at plugs
new plugs
fuel shutoff works fine
Thanks..SR
tomplum
bill_kapaun
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SR6112Original Author