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Hello everyone! I have a Briggs and Stratton 3.5hp engine fitted to a
Hayter rotary mower from the mid 1970s.
CY: I thik they used breaker points back then.

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
CY: They had some defective Champion plugs. Do you have another brand
available?

and air filter foam element (old one was disintegrating,
saturated new one with oil and squeezed excess out), filled the sump
with fresh oil
CY: Those 3.5 HP engines typically took 16 to 20 ounces of 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
CY: Those, typically the carb adjustment screw is right all the way in
(gently) and then out 3/2 of a revolution.

(I have found I can start it
and get it to idle very slowly with the throttle lever set to minimum).
CY: Hmm. Can't remember what that means.


Do I need to play with the idle adjustment screw?
CY: Sure, try it. Might also need new breaker points, or to have the points
cleaned.

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?
CY: I'd try to run it again for awhile, and burn the oil out of the system.
Also can clean the spark plug with a squirt of ether spray to rinse off the
plug.


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).
CY: Done so.