Hey hoosie5seventy a few answers
NO pump or pump filter problems. My bike was a early production FE570 2010.
I’ve had two issues both of which were MY FAULT not the design of the bike. The starter slip gear and clogged oil pump intake filter from clutch fiber. I have complete information on my previous posts. I had a fuel line quick connector in the tank come apart because I did not get all four tabs fasten correctly when I put a pro-fill pump filter sock on the pump.
I have the original fuel filter but I do run a pro-fill tank sock very important to keep fuel clean and fresh fuel (no water from ethanol fuel) in these bikes.
At about 3,000 miles I fixed the water pump seals, have not touch them since that was 13,000 miles back. I also have a complete post on the fix.
I have check the valves twice with no change, these bike have a great valve train design.
I change the oil (shell t6 full synthetic) at 600 to 800 miles.
I use a strong magnetic in the drain plug. I get no slivers and very little metal power wear on the magnetic and the oil screen is always clean.
At 20,000 miles I will replace valve stem seals and valve springs
Piston assemble Rod assemble, main bearings, sprocket out put shaft bearing, oil pump gears(two) and gear drive pins.
These bikes have a great piston thrust face that will last many miles, it will probably run much long than my replacement target but this bike gets rode hard so I won’t take a chance on a failure.
All other bearings and parts will be checked and replaced as needed.
I use Techron injector cleaner, check my post on this.
Very good engine and it is still mechanically quiet for a spur geared (straight cut primary drive gears) single cylinder, when compared to the new dye cast 500 KTM and most other single cylinder dirt bikes.