Allotment Gardening Advice Help Chat

Chatting => Equipment Shed => Topic started by: andyw on June 13, 2012, 22:06

Title: Briggs and Stratton classic 35
Post by: andyw on June 13, 2012, 22:06

On this engine is there and kind of manual throttle or choke control? I've got a mountfield sp464 with engine, but am surprised there are no controls for this.  Also when the engine runs the engines rpm's rise and fall constantly.  If anyone could shed some light on the I would be grateful.

Title: Re: Briggs and Stratton classic 35
Post by: Gwiz on June 14, 2012, 05:38

You'll probably have a push-bulb-primer to start the engine. That takes away the need for a choke.
Many mower makes no longer fit a throttle (don't need one if you don't have to set the engine to "choke" to start it.
Engine "hunting" is common on this model when the carb diaphragm becomes old, the fuel pick up pipe get blocked, or the push-to-prime bulb gets a hole in it.
See this topic:
http://chat.allotment-garden.org/index.php?topic=93993.0

Hope this helps.

Title: Re: Briggs and Stratton classic 35
Post by: andyw on June 14, 2012, 13:29

Thanks for the help.  I have the carb and tank off and will replace with a new Diaphram tomorrow, plus some new oil and spark plug.

Andy

Title: Re: Briggs and Stratton classic 35
Post by: Motivator on June 19, 2012, 09:58

Works a treat .  :)

Title: Re: Briggs and Stratton classic 35
Post by: andyw on June 19, 2012, 16:01

Quick update, when the engine is told it takes about 10-15 pulls to start and then does rev up and down for a while.  Could the governor spring need replacing?

Title: Re: Briggs and Stratton classic 35
Post by: Gwiz on June 19, 2012, 16:34

It really shouldn't take that many pulls to get it going, 3 is usual

Title: Re: Briggs and Stratton classic 35
Post by: andyw on June 19, 2012, 19:14

It seems that It needs to be primed about 6-7 times from cold.  Maybe this is linked to the up and down revving?  Maybe a blocked pickup tube?

Title: Re: Briggs and Stratton classic 35
Post by: Gwiz on June 19, 2012, 20:17

Have you replaced the diaphragm?

Title: Re: Briggs and Stratton classic 35
Post by: andyw on June 20, 2012, 08:01

Yep.

Title: Re: Briggs and Stratton classic 35
Post by: Gwiz on June 20, 2012, 12:39

It may very well be then.