18.5 hp Twin II Briggs and Stratton
Type 2280 E1
Made the fatal mistake of buying an Ariens with a 21hp Briggs Intek from home Depot. I could write a book on it but I ended up replacing engine with the above Twin II last spring.
Had the carborator rebuilt and it has ran great, but now, after about an hour's worth of mowing, it wants to die unless I choke it.
dougand3 , carb rebuilt spring 2018. I try to avoid ethanol as much as I can, but can't rule out that some may have been ran through it. I don't understand why it runs great for the first 45 to 60 minutes, and then starves for gas. Yes I the tank is vented as the original 21hp Intek had a hose running from carb to gas tank that is not needed with this older Twin II Briggs. So it is open ...
It got so bad that it wouldn't run at all with out choke fully engaged.
Next day, I ran it for about half an hour and it seemed to run pretty good. I have no doubt that it wouldn't have been the case if I kept on running it ...
I tried changing the fuel pump diaphragms on a Briggs Twin carb, which I had previously done 4 years earlier, but this time I sprayed some carb cleaner into the holes where the pump housing mounted to the front of the carb. Evidently,that carb cleaner was just enough to finish stopping up the passage that Cannon referred to above the main jet, and afterwards the engine would no longer run. After repeated attempts to clean the carb, I finally unscrewed the main jet (took an Allen wrench) and then I was able to get the passage above the main jet open.
If not fuel starvation getting to carb then I would suspect something floating around in carb bowl. I always pull plug our of side and remove jet and clean and take top off of carb.
I like the single briggs.
They are not power match for a twin (of any hp rating or style)but they are easy to fix and parts and cheap and plentiful. Hardy no catastrophic engine failures, unlike the intek twins that will snap a rod in a heartbeat if low on oil, slip valve guides on right cyl and ingest pushrod. Plus parts are more for them and carbs are outrageous still.