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Team70R

Losing compression through spark plug!?

By Team70R, in Engines

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Team70R    157

Team70R
Posted

Picked up a Honda g300 a while ago to put into my 606.. Didn't have spark but got that fixed and got it running! Now it won't run and is blowing fuel out from the spark plug!! Would this cause it to not start? Brand new plug and threads in tight 

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KC9KAS    4,741

KC9KAS
Posted

Sounds like the head is cracked at the spark plug threads, or the plug is not completely seated in the hole.

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953 nut    55,163

953 nut
Posted
43 minutes ago, Team70R said:

new plug and threads in tight 

Take a look and make sure the washer from a previous spark plug isn't in the cocked slightly and preventing the plug from sealing.

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Team70R    157

Team70R
Posted

Is there usually a factory pressed in washer around the hole on the outside? We removed what looked to be an old washer from around the hole 

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KC9KAS    4,741

KC9KAS
Posted
20 hours ago, Team70R said:

Is there usually a factory pressed in washer around the hole on the outside? We removed what looked to be an old washer from around the hole 

There is a washer type item on the spark-plug....maybe an old washer from a previous plug was "jammed" into the head and that is causing the loss of compression as @953 nut said.

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Team70R    157

Team70R
Posted

Gonna take it to a local machine shop and see if they can take a look at it.

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