inside the engine block...hmmm thats new... or i miss something here...

for the slipping..yes it happens. fuel from the engine leak out to the one-way. especially using rotostart. due to the torque & fast spinning... it easy to spoil yer one-way bearing. whenever it can't be started.. check whether the engine flooded. STS got strong compression. u cant feel the tension when using roto. easy to break the one way. easy just clean out the fuel/oil. and if its new, try open a bit the plug like quarter turn to release some compression.

sorry, my english is poor.