Hello everyone! I have a Briggs and Stratton 3.5hp engine fitted to a
Hayter rotary mower from the mid 1970s. The Model number is 92982 and
the Type number is 1640-01. It's a 4 cycle, single cylinder, L-head,
air-cooled engine for information.
The problem is I have had it sitting idle for 5 years as the starter
rewind spring broke and lack of time prevented getting it sorted
sooner. Last week I bought a new spring, rope, (approved Champion/B&S)
spark plug and air filter foam element (old one was disintegrating,
saturated new one with oil and squeezed excess out), filled the sump
with fresh oil and put in half a tank of fresh 95RON unleaded.
So far, so good. But pulling the rope and some carburetor needle valve
tweeking got the engine to start eventually, burning off the oil I had
put in throught the spark plug hole. It then splutters and pops (rich
mixture burning within the exhaust?) The spark plug has looks like it's
not running lean (fuel/oil on it). It then cuts out (maximum of about
15 seconds after starting). Then you can restart straight away. Any
ideas as to the adjustments I need to do (I have found I can start it
and get it to idle very slowly with the throttle lever set to minimum).
Do I need to play with the idle adjustment screw? Is there the
possibility that the carburetor needs new parts too? I've heard B&S do
carburetor kits - how much would I be looking at (UK Pounds) and what
parts do they contain - anyone ever used one?
I know this is a long posting, but i'm not too hot on my knowledge of
getting carbs to work perfectly for a smooth idle.
Thanks in advance. (This email address is invalid because of spammers
so reply on here).