spark plug

[REN07]

What causes the bottom of the plug to bend until there is no gap?

 

[TylerG]

What causes the bottom of the plug to bend until there is no gap?

the piston hitting it is a possibility... check that its the right plug for your machine

 

[rusty]

i think it is a heat issue .

 

[REN07]

Its the right plug i put a new one in and it ran GREAT

 

[magnet]

make sure its the right plug. even brand specific. i had a boat with a goodyear outboard on it 35hp. any plug except the factory autolight plug would run great until engine was hot. then would slowly get squished closed at full rpm. wrapped my keychain ring around the bottom of it once to get off the lake. put in the proper ones never had an issue again.

 

[REN07]

it ran good all day then that happend and i herd some ticking noise ????

 

[magnet]

rod or piston pin bearings finished. would be my guess

 

[REN07]

but it ran great after i changed the plugs and the ticking was gone i was hitting peek RPM'S

 

[stripe]

look at this pg see if you can find your plug


http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html

 

[REN07]

kinda hard to tell probley 21-24 there was no gap

 

[dtcat]

check the top of your piston if you have a wrist pin bearing gone you may have put a dent in it when it was hot it will run good for a while then let go you can see it through spark plug hole or by removing y pipe

 

[REN07]

i put a screw driver down the hole i did'nt feel anything out of the ordinary