Thanks Tyler, sorry got the delay in getting back to you.
There have been reports of the Sprinter mowers surging and kicking back on starting due to the lightweight bar blade supplying an insufficient force to assist in starting and running like a blade plate normally does.
I would suggest blasting degreaser through all ports in the carb, remove the main jet and blast some up the non removable emulsion tube.
My sprinter does sound quite gutless when revved up (I only use it to pick up leaves of the lawn around the edges as it is small and nimble), but if it does need adjustment, undo the screw 2 inchs to the right of the fuel cap (in your video) and remove the vented plate, and you will see the governor spring. It attaches to the throttle butterfly at one end and the other to a metal tab - slightly bend the tab towards the front of the mower (gain spring tension) to make it rev a bit more - but don't go too fast and don't alter the spring itself in any way.
Might also replace the fuel line as it could be internally disintegrated and cause subsequent clogging.
Regards
Tyler[/quote]
Not sure about the 'Sprinter brand', but it's a B&S 190cc engine installed on a separate/spare mower base I had. The engine number is #12J902 - 1128 - 01 11092958 (see attached pics)
I used carb cleaner and sprayed through all the holes followed by compressed air, prior to reinstalling. Ill give it another shot in case I didn't get it all.
Re. the governor spring, Ill give that a shot, though not sure why it started being gutless, pretty sure it was running find in the past. Ill bend that tab and see how it goes.
I inspected the hose, still looks pretty good. Fuel flows freely, no probs. Ill give the other suggestions a shot, and see how it all goes, then report back.
Thanks again, much appreciated
