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Briggs & Stratton 3.5hp Engine Will Not Start with Air Filter Bolt Installed

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Briggs & Stratton 3.5hp Engine Will Not Start with Air Filter Bolt Installed Davy 06-10-2007
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Posted by Davy on June 10, 2007, 5:13 pm
My 1968 B&S 3.5 HP lawnmower engine (92902, pulsajet carb with two fuel
pickup tubes) will not start unless I remove the air filter; nor will it
start with just the air cleaner bolt installed without the air filter.
I have serviced the carb and replaced the gasket. I have checked and am
certain that the bolt is not interfering with the movement of the manual
choke.

Anyone experienced this problem?

Davy



Posted by The Natural Philosopher on June 10, 2007, 6:44 pm
Davy wrote:
> My 1968 B&S 3.5 HP lawnmower engine (92902, pulsajet carb with two fuel
> pickup tubes) will not start unless I remove the air filter; nor will it
> start with just the air cleaner bolt installed without the air filter.
> I have serviced the carb and replaced the gasket. I have checked and am
> certain that the bolt is not interfering with the movement of the manual
> choke.
>
> Anyone experienced this problem?
>
> Davy
>
>
Never anything remotely like it.

Its not shorting a wire or summat is it?

Posted by Meat Plow on June 10, 2007, 11:34 pm
On Sun, 10 Jun 2007 22:13:05 +0100, Davy wrote:

> My 1968 B&S 3.5 HP lawnmower engine (92902, pulsajet carb with two fuel
> pickup tubes) will not start unless I remove the air filter; nor will it
> start with just the air cleaner bolt installed without the air filter.
> I have serviced the carb and replaced the gasket. I have checked and am
> certain that the bolt is not interfering with the movement of the manual
> choke.
>
> Anyone experienced this problem?
>

Just what did you service?

Yes I have seen similar carbs that wouldn't run
with a cleaner. The added vacuum sucked too much gas. Spark plug wet when
it won't run?



Posted by R on June 11, 2007, 2:23 am

> My 1968 B&S 3.5 HP lawnmower engine (92902, pulsajet carb with two fuel
> pickup tubes) will not start unless I remove the air filter; nor will it
> start with just the air cleaner bolt installed without the air filter.
> I have serviced the carb and replaced the gasket. I have checked and am
> certain that the bolt is not interfering with the movement of the manual
> choke.
>
> Anyone experienced this problem?

Gotta be a blocked jet somwhere or a gasket covering a hole.



Posted by Sylvain VAN DER WALDE on June 11, 2007, 8:29 am

>
>> My 1968 B&S 3.5 HP lawnmower engine (92902, pulsajet carb with two fuel
>> pickup tubes) will not start unless I remove the air filter; nor will it
>> start with just the air cleaner bolt installed without the air filter.
>> I have serviced the carb and replaced the gasket. I have checked and am
>> certain that the bolt is not interfering with the movement of the manual
>> choke.
>>
>> Anyone experienced this problem?
>
> Gotta be a blocked jet somwhere or a gasket covering a hole.

I second that opinion. I suggest that you dismantle that carburetter again,
and clean it thoroughly in clean petrol (having thoroughly cleaned the
outside first with Gunk, paraffin, or petrol). Preferrably, blow through all
the jets with compressed air. As as been suggested; some gaskets can be
fitted the wrong way round, thus covering a fuel or air jet.
BTW, I have no experience of that particular carburetter.

Sylvain.

>
>



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