FOD'd '85 250R
Foreign Object Damage - My piston and cylinder head were bouncing a piece(s) of magnetic metal back and forth between each other, ultimately closing the plug gap. Once I disassembled the motor, there were about 30 tiny pieces of magnetic metal that would fit on a 50 cent piece in the pipe. I have NO IDEA what it used to be or where it came from. The rings are in tact, though run over by aluminum from the piston, the reeds and screws are all there, and nothing else looks out of place. I'm going to need to do a new crank/rod at this point, bearings and seals, plus a new piston and bore for the third time. I'm even thinking about doing a rad valve or a V-Force reed cage. I'd really like to put it back together and be confident this phenomenon won't happen again, any ideas where to look? PLEASE?!?
'78 Honda ATC90 (132cc)
'83 Honda ATC70 (88cc)
'85 Honda ATC250R
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'04 Honda 400EX
'73 Honda Trail 90
'01 Honda XR70R (125cc)
'16 KTM 500 EXC