B&S classic 35

[openspaceman]

 

On 9/11/2017 at 15:34, GardenKit said:

Erratic running and 'hunting' are likely to be carburettor related and require a carb overhaul or new carb.

Thanks Barrie,

23 hours ago, lurkalot said:

If symptoms are like choke being suck on, puffing black smoke etc.  Stick a new diaphragm and gasket in it and it'll be fine.  At least until it sucks it in again. They have a habit of doing this.  Part number 795083

Yes I think it is over rich so may need a carb kit, symptoms are that it is failing to reach more than 2500 rpm with the throttle held open , much like if the choke were on (if it had one), I've had the same symptoms when a main jet fell out on another engine  but I will take Barrie’s suggestion to change the plug first.