Plugs - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 19 (permalink) Old 04-29-2018, 11:40 AM Thread Starter
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My question is about the right rear plug. What a freaking nightmare...I was very slow when trying to sit and rethread the new plug. I couldn't really get it started with a hose attached to the top of the plug but after dropping it down in there a few times I got it started with the deep socket attached to the plug. I spent a good 1/2 hr. turning it from slightly different angles thinking it should thread loosely for most of the way in but after a few threads there was resistance. I finally committed and wrenched the socket until it stopped then gave it another quarter turn. I did not torque it. It started and is running smooth. Would I know if it wasn't seated properly and I cross threaded it? If it wasn't seated properly would there be evidence of this in the way it ran? Paranoid!

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post #2 of 19 (permalink) Old 04-29-2018, 02:31 PM
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There is really no way to know if you cross threaded it even slightly. Usually the plug will spin in until it touches the sealing ring but can have a slight resistance too.
You are probably ok. Did you use any anti sieze on the threads?
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post #3 of 19 (permalink) Old 04-29-2018, 02:53 PM Thread Starter
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I did not.

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post #4 of 19 (permalink) Old 04-29-2018, 03:05 PM
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Ive had new plugs that went in snug on cars before, to where I could not screw it in with the extension on the socket, I had to put the wrench on it.

I know what you mean, its a sick feeling. As long as it went in with pretty much the same slight torque all the way, like two fingers on the ratchet wrench you are ok. If it was cross threaded I think it would get harder and harder to screw in as it went.

If you did cross thread it, its not the end of the world, you can put a helicoil in if you need to. When you take it out next time check the threads on the plug for stripped out aluminum.
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post #5 of 19 (permalink) Old 04-29-2018, 03:17 PM Thread Starter
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I'm getting a new front tire next week. I'll have them take a look. If the plug is not all the way in I assume it would run rough. Thanks for the reply.
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post #6 of 19 (permalink) Old 04-29-2018, 03:37 PM
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We are talking steel base of a plug going into aluminum so it is possible you had resistance because there could have been a little crud in the threads when you removed the old one. I once crossthreaded a plug so bad on a dirt bike when I was a kid, it blew the plug out after i started it! Like kcw said, we all been there.
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post #7 of 19 (permalink) Old 04-29-2018, 06:43 PM
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Hope all turns out OK for you. From past experience I will not put a new plug into anything without antiseize. I stipped a plug hole in a very expensive set heads once in a race motor. That was a very bad day.

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post #8 of 19 (permalink) Old 04-29-2018, 06:46 PM
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I wonder if you can get a nut that is the same size as the threads on a spark plug? Then if the plug does not seem to want to screw in right, you could take it out and screw the nut on the spark plug to chase the threads and clean them up. I think the threads are 14mm x 1.25mm.

It has never occurred to me to check the threads on a spark plug before installing it. I guess they could get buggered up a bit if the spark plug was mishandled or dropped somewhere.

Last edited by KCW; 04-29-2018 at 07:03 PM.
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post #9 of 19 (permalink) Old 04-29-2018, 07:12 PM
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one other thing that can happen, if your engine is running rich and there is a lot of carbon on the plugs,

as you take them out the carbon will deform the threads in the aluminum head. When you put the new clean plugs in they will need to push the threads back into shape a bit. So if your plugs were fouled you can expect the new ones will go in a little tight.
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post #10 of 19 (permalink) Old 04-29-2018, 07:51 PM
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Quote:
Originally Posted by lesblank View Post
Hope all turns out OK for you. From past experience I will not put a new plug into anything without antiseize. I stipped a plug hole in a very expensive set heads once in a race motor. That was a very bad day.
Agreed. I almost broke off the threads in the park plug hole on a dodge truck once because the previous owner did not use any antisieze and the plug was rusted in the head. A tube of antisieze will last almost a lifetime!
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Originally Posted by KCW View Post
I wonder if you can get a nut that is the same size as the threads on a spark plug? Then if the plug does not seem to want to screw in right, you could take it out and screw the nut on the spark plug to chase the threads and clean them up. I think the threads are 14mm x 1.25mm.

It has never occurred to me to check the threads on a spark plug before installing it. I guess they could get buggered up a bit if the spark plug was mishandled or dropped somewhere.
Yep I have seen threads dinged up from the factory and possible it happened to him making it seem he was crossthreading it.
I worked for a company where we used to make hydraulic fittings and one of the workers was just tossing them in the box. Our quality department had to reject about 5000 fittings because all the threads and sealing surfaces were all banged up. We would sample batches using go and no-go gauges.
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