Just brought a new ys170 , just run the engine 4 times with rpm no more than 4000 . the last run the prop came loose and broke the spinner .

Funny is after i replace the spinner n try again the next day it just won't start at all !! When i turn the spinner around , there seems like some knocking sound

from the engine 'click' sound .... is that normal ? i try start the engine again but non was succesfull , when i open out the glow plug , the plug is fill with fuel ,

i clean it n put it back n have try to start it serveral times , still cannot get it run !!?? it seems like the engine glow plug flooding all the time(engine is in the plane and inverted)

Should i try turn it over, place on the stand , so the engine is up-right ??

Any suggestion ??