B&S 10HP OHV runs smooth then a quick sputter then repeats

S

soncloud9

Forum Newbie
I have a 10HP OHV B&S on a Generac generator. It had a filthy carb and would not start. I took the carb apart and cleaned it, cleaned the plug, put a clean fuel filter and replaced the gasoline. It cranked right up and runs smooth except it has hiccups. It will run for 10-15 seconds then have a quick sputter and then repeat this cycle. Any ideas?
 
My guess is that you will have to clean the carb again. If you did not do so, I would replace the float needle and seat, plus set the float level properly.
 
Rivets said:
My guess is that you will have to clean the carb again. If you did not do so, I would replace the float needle and seat, plus set the float level properly.
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The carb is pretty darn clean. I checked the seat and it's very clean. I don't see any way to adjust the float. Would the little sputter come from too high or too low a float level. If this matters, the generator has about 30 hours on it and it has been sitting for around 5 years without any use.
 
The float needle seat may look good, but may have swelled from the old fuel sitting in the carb. This will result in a lean mixture, which is why I always replace it when I clean carbs.
 
tom3 said:
Try it with a load on it, couple 500 watt work lights is good, doesn't need exact voltage etc.
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With no load you may be still running on the low speed circuit or just transitioning to the high speed circuit. If it runs without hiccups with a good load on it you have a problem with the carb low speed circuit. Watch the govenor linkage when it hiccups. Does it open up the throttle right when it hiccups for about a second?
 
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