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Briggs & Stratton mower engine races and drops like clockwork JM_newsgroups 02-23-2008
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Posted by JM_newsgroups on February 23, 2008, 8:19 pm
Hello,

I have a base-level 3.5 HP Briggs & Stratton engine that's about 6
years old. It's a throttle-free design with a primer bulb. Lately,
after I get it started, it goes in to a rhythm of racing and dropping
off about every second. This started rather suddenly. The plug is
OK. I started to take it apart, because I didn't even know if mowers
had "points". I assume it's some kind of induction ignition system
based on the setup of the cutoff switch and the magnetic flywheel.
The carb looks like nothing more than a plastic throttle body, and I
don't see a float/bowl of any kind. I generally don't repair mowers,
obviously. Does anybody recognize that surging/dropping behavior?
Thank you!

Thanks,

JM

Posted by SHOPDOG on February 23, 2008, 9:05 pm
SOunds like the diaphragm, which is between the plastic carb body and tank



Posted by George on February 23, 2008, 11:15 pm
On Sat, 23 Feb 2008 17:19:41 -0800 (PST), JM_newsgroups

>Hello,
>
>I have a base-level 3.5 HP Briggs & Stratton engine that's about 6
>years old. It's a throttle-free design with a primer bulb. Lately,
>after I get it started, it goes in to a rhythm of racing and dropping
>off about every second. This started rather suddenly. The plug is
>OK. I started to take it apart, because I didn't even know if mowers
>had "points". I assume it's some kind of induction ignition system
>based on the setup of the cutoff switch and the magnetic flywheel.
>The carb looks like nothing more than a plastic throttle body, and I
>don't see a float/bowl of any kind. I generally don't repair mowers,
>obviously. Does anybody recognize that surging/dropping behavior?

The governor would be a candidate. I had that with a broken governor
spring.

G

Posted by Bob F on February 23, 2008, 11:55 pm

> Hello,
>
> I have a base-level 3.5 HP Briggs & Stratton engine that's about 6
> years old. It's a throttle-free design with a primer bulb. Lately,
> after I get it started, it goes in to a rhythm of racing and dropping
> off about every second. This started rather suddenly. The plug is
> OK. I started to take it apart, because I didn't even know if mowers
> had "points". I assume it's some kind of induction ignition system
> based on the setup of the cutoff switch and the magnetic flywheel.
> The carb looks like nothing more than a plastic throttle body, and I
> don't see a float/bowl of any kind. I generally don't repair mowers,
> obviously. Does anybody recognize that surging/dropping behavior?
> Thank you!

Or, just a mixture adjustment.



Posted by on February 24, 2008, 8:15 am
> Hello,
>
> I have a base-level 3.5 HP Briggs & Stratton engine that's about 6
> years old. It's a throttle-free design with a primer bulb. Lately,
> after I get it started, it goes in to a rhythm of racing and dropping
> off about every second. This started rather suddenly. The plug is
> OK. I started to take it apart, because I didn't even know if mowers
> had "points". I assume it's some kind of induction ignition system
> based on the setup of the cutoff switch and the magnetic flywheel.
> The carb looks like nothing more than a plastic throttle body, and I
> don't see a float/bowl of any kind. I generally don't repair mowers,
> obviously. Does anybody recognize that surging/dropping behavior?
> Thank you!
>
> Thanks,
>
> JM

Try taking off the top rewind (pull-starter). You may have the classic
"critter nest" under it preventing the air vane from moving. (If I
remember that motor correctly)

pz

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