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Old 02-15-2010, 05:19 PM   #1 (permalink)
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What would cause a piston to hit a spark plug?

It just nicked it and nothing broke off the plug.


plugs were tan.
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Old 02-15-2010, 05:41 PM   #2 (permalink)
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QUOTE (snopro31 @ Feb 15 2010, 05:19 PM)
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What would cause a piston to hit a spark plug?

It just nicked it and nothing broke off the plug.


plugs were tan.[/b]
I dont think that is even possible. the only way would be if the rod bearing let loose or the rod broke but I would think the piston would hit the head before it got even close to the spark plug. Detonation will flatten out a spark plug though and blow a hole in the piston.
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Old 02-15-2010, 05:45 PM   #3 (permalink)
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QUOTE (Greg B. @ Feb 15 2010, 04:41 PM)
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I dont think that is even possible. the only way would be if the rod bearing let loose or the rod broke but I would think the piston would hit the head before it got even close to the spark plug. Detonation will flatten out a spark plug though and blow a hole in the piston.[/b]
maybe thats what it was.

but theres a mark on the piston from the plug.

when i turn the secondary the pistons go up and down fine, not catching no noise.
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Old 02-15-2010, 05:48 PM   #4 (permalink)
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Water in your gas will pepper up the head.
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Old 02-15-2010, 05:50 PM   #5 (permalink)
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QUOTE (FIREBALL 440 @ Feb 15 2010, 04:48 PM)
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Water in your gas will pepper up the head.[/b]
was all fresh gas and no sign of power loss or anything. just the sound like a bearing was gone.


the weird part was it idled fine but when i touched the gas it made the noise. then i turned it off fast.
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Old 02-15-2010, 06:18 PM   #6 (permalink)
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QUOTE (snopro31 @ Feb 15 2010, 05:45 PM)
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maybe thats what it was.

but theres a mark on the piston from the plug.

when i turn the secondary the pistons go up and down fine, not catching no noise.[/b]
lol... when I turn my secondary my sled just tries to move in whichever direction I am moving the clutch... weird

but no seriously.... by the sounds of it you don't have the motor apart nor did you even do a compression test.. so I would start there.
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Old 02-15-2010, 06:20 PM   #7 (permalink)
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QUOTE (token @ Feb 15 2010, 05:18 PM)
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lol... when I turn my secondary my sled just tries to move in whichever direction I am moving the clutch... weird

but no seriously.... by the sounds of it you don't have the motor apart nor did you even do a compression test.. so I would start there.[/b]
if it was seized or the crank let go it wouldnt turn the pistons up and down like normal. so it cant be a seize or a done crank.

theres no hole in the top of the piston and no pitting. just the mark.
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Old 02-15-2010, 06:29 PM   #8 (permalink)
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QUOTE (snopro31 @ Feb 15 2010, 06:20 PM)
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if it was seized or the crank let go it wouldnt turn the pistons up and down like normal. so it cant be a seize or a done crank.

theres no hole in the top of the piston and no pitting. just the mark.[/b]
Whats your compression? Are the bottoms of the plugs Physically damaged? ie : bent? If I piston actually did smack the electrode on your plug surely it would be bent pretty good?
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Old 02-15-2010, 06:30 PM   #9 (permalink)
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Just because you can turn it over by hand..... really means nothing.
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Old 02-15-2010, 06:31 PM   #10 (permalink)
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QUOTE (FIREBALL 440 @ Feb 15 2010, 06:30 PM)
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Just because you can turn it over by hand..... really means nothing.[/b]
100%... and most of the time I bearing wont make enough sound while its turning over by hand to ever hear with your ear.
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