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post #1 of 9 (permalink) Old 01-22-2012, 03:52 PM Thread Starter
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Angry 400ex spark plug problems.

Ok, I have the special tool to change my spark plug. It goes down over top of my plug but wont pull it out. the threads on the top of the plug arent stripped. This is my first time changing it since ive owned it used. it is a 2002 and i bought a stock plug for it and the tool fits it. Could whoever owned it before me put a smaller plug it in? is that possible?
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post #2 of 9 (permalink) Old 01-22-2012, 04:01 PM
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Welcome to the forums.
the plug size is an 18mm if you got it loose you can take a piece of 3/8 fuel hose about 4" long and stick it over the end of the plug and pull it out, it works well for installing the plug too. the 400ex is in an awkward spot for sure.

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post #3 of 9 (permalink) Old 01-22-2012, 05:19 PM Thread Starter
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I know that. but the plug is smaller then an 18. is that even possible?
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post #4 of 9 (permalink) Old 01-22-2012, 05:22 PM
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I know that. but the plug is smaller then an 18. is that even possible?
yeppers...someone stuck the wrong plug in it..just because it has the same threads for the cylinder ..does not mean it has the same outside wrench pattern as a stock spark plug..sooooo..more than likely...someone put the wrong plug in it.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '05 trx500fm
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post #5 of 9 (permalink) Old 01-22-2012, 05:23 PM Thread Starter
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I just gotta pray they werent complete jackasses and put a plug with the wrong threads in it...
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post #6 of 9 (permalink) Old 01-22-2012, 05:24 PM
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This is true ^^^^ I was thinking you got it loose but were having difficulty getting it out. sorry bout that

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

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post #7 of 9 (permalink) Old 01-22-2012, 05:38 PM
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I just gotta pray they werent complete jackasses and put a plug with the wrong threads in it...
the threads won't change...it's the shank of the spark plug's length you need to worry about !!..if the spark plug was too long ?..the piston would smack it on the stroke !..this is what you need to worry about..not the spark plug's threads...lol.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '05 trx500fm
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post #8 of 9 (permalink) Old 01-22-2012, 05:40 PM Thread Starter
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Just went out to the garage and got it out with a 16mm socket, the shank on the old plug was shorter then the plug i put in it so its all good. I had been wandering why it was so rough. Lets hope this fixes it!
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post #9 of 9 (permalink) Old 01-22-2012, 05:48 PM
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Just went out to the garage and got it out with a 16mm socket, the shank on the old plug was shorter then the plug i put in it so its all good. I had been wandering why it was so rough. Lets hope this fixes it!
you should be golden if you do not put a long spark plug in ?..hope it works 4 ya !.

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