2008 Hisun 500 Cutting Out Under Load

[Hisun .500]

I've got a 2008 Hisun 500 cc and I've been having problems with it cutting out under load or at a  certain  speed ,or when I floor it its always the same noise and no power I've  changed spark plug  ,coil coil wire valves, ,timing chain ,filter  throttle cable  ,carburetor , stator ,,,,,so this started one day while riding and it backfired a bunch of times and it shut off going down the road but came back on before we stopped we made it home and its never been the same since....please help

 

[Savage3]

Start by checking compression,  then timing

[etimc]

I may have seen this problem before also - my buddy was a champion motorcycle racer /  bike builder until an accident landed him in a wheel chair - the first time i rolled up to the sidewalk next to him and shut it off, to show him my new toy, his first words from his mouth were "your exhaust valves are to tight"  - dang it, he was right - i was always trying to figure why it would stall at stop signs - had to wait about 2 months for someone to bring me a feeler gauge back from the states and it was getting worse (I couldnt find one here in my area in Costa Rica) - got the gauge, followed the instructions and that problem was gone

 

[Savage3]

Yes sir, that's what I was thinking. The compression test followed by a leak down test will illuminate a valve train issue. Make it easier to nail down the location of the problem. 

[Scott Meszaros]

our mule did exactly the same thing, but ours was a plugged fuel filter.............new filter and some seafoam in the tank and problem was solved.................but i see you changed the fuel filter, so hope you get it fixed.........