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Hey yall, so before I started mowing today, i tore that Briggs 150cc apart, first thing I did was gap the plug, then I used my torque wrench to put it back in, 15 ft lbs, per instructions in the manual, after I finished mowing I pulled the plug again, checked The gap, but couldn't get the gap tool on. So, I thought the piston may be hitting. Set the engine to TDC, put the plug back in, couldn't even torque it all the way, it's definitely hitting the piston. It's the plug that came with the mower, and I haven't done any internal maintenence. I thought maybe the rod was thrown, but the oil level is good. Anyone know what could cause this? IM SO CONFUSED!

valves, maby even a slightly bent rod

FloGro said:

valves, maby even a slightly bent rod

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What about valves? Bent valve stems?

could be the valve seat coming out of the head , id just take the head off and start looking around, post a pic and im sure someone will be able to point it out

what plug are you using? a RJ19LM?

FloGro said:

could be the valve seat coming out of the head , id just take the head off and start looking around, post a pic and im sure someone will be able to point it out

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I'm gonna go tinker with it in a sec, pics to come. I'm not sure what the part number on the plug is, but I'll let you know when I get it pulled.

FloGro said:

what plug are you using? a RJ19LM?

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champion RC12YC

FloGro said:

what plug are you using? a RJ19LM?

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Here's some pics, not sure if they'll show you what you need.

Here's the pics

model# on the engine would help to determine if you are using the right plug.

tomsteve said:

model# on the engine would help to determine if you are using the right plug.

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It's the right plug.

I figured it out yall. Spark plug lost the compression washer allowing the plug to screw in too far. Thanks for all the help

Gearhead0101 said:

I figured it out yall. Spark plug lost the compression washer allowing the plug to screw in too far. Thanks for all the help

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Oh ****... the most obvious thing is the easiest to overlook lol.
How did it lose the washer... those are pretty much on there if you know what I mean.

Mike88se said:

Oh ****... the most obvious thing is the easiest to overlook lol.
How did it lose the washer... those are pretty much on there if you know what I mean.

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yeah your tellin me haha it took four rednecks to figure it out.

Nice lol, I think the 12yc is the same as NGK's BPR6ES, if your gunna get a new plug get that one , my engines usually run better with the BPR'S

FloGro said:

Nice lol, I think the 12yc is the same as NGK's BPR6ES, if your gunna get a new plug get that one , my engines usually run better with the BPR'S

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you wouldn't happen to know of a platinum tip that cross references with the 12yc would you?

FloGro said:

Nice lol, I think the 12yc is the same as NGK's BPR6ES, if your gunna get a new plug get that one , my engines usually run better with the BPR'S

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:thumbsup: I always feel better about using NGK.
Gearhead I like regular old NGK plugs but if you want plats go to the cross reference site or NGK and find what you need.
Spark plug cross reference

Mike88se said:

:thumbsup: I always feel better about using NGK.
Gearhead I like regular old NGK plugs but if you want plats go to the cross reference site or NGK and find what you need.
Spark plug cross reference

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awesomeness. Thanks Mike

This is going my memory banks.... Compression ring hahahahaha

exotion said:

This is going my memory banks.... Compression ring hahahahaha

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I'm still kinda curious as to how it lost it, but I replaced the plug with a compression ring on the new one and it purrs like a kitten. Gap stays open too lol