Spark Plugs

JamesC
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Spark Plugs

Postby JamesC » Sat Apr 14, 2018 6:33 pm

My rear cylinder wasn't firing properly on my 03 140 Intruder. I pulled the plug and not only was it black with soot, it was very loose. I have found that it is very difficult to install the plugs with a standard deep 18mm socket. Luckily, I had the original tool pouch from the last intruder I owned. It has a spark plug tool that works perfectly. So tomorrow I will be replacing both plugs with new ones. My question is, what gap do you fellows find most appropriate? The handbook says 0.8 - 0.9 millimeters. I was thinking of going a little larger, maybe 0.933. What do you fellows think?

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Herb
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Re: Spark Plugs

Postby Herb » Sat Apr 14, 2018 7:44 pm

If you are running stock plugs, I would stick with the 0.8-0.9mm. These don't have the strongest ignition spark to start with and too wide a gap can cause a misfire issue.
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JamesC
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Re: Spark Plugs

Postby JamesC » Sat Apr 14, 2018 8:34 pm

What about fuel? Any difference between brands? I was going to gap a little more because I run premium. I know the handbook says 87 octane, but all my biker buddies go with the premium for some reason.

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Re: Spark Plugs

Postby Lechy » Sat Apr 14, 2018 10:26 pm

Intruders are low compression and do not need the higher octane. It won't run any better so why throw away money.

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Leckbass
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Re: Spark Plugs

Postby Leckbass » Sun Apr 15, 2018 3:03 am

Lechy wrote:Intruders are low compression and do not need the higher octane. It won't run any better so why throw away money.

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Exactly

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Re: Spark Plugs

Postby navigator » Sun Apr 15, 2018 8:56 am

Your bike will run a lot better with 87 octane and .035 gap.
Pull the chrome head cover off for better access.
Don't forget to blow away any debris with compressed air before you pull the plugs.
A piece of 5/16 fuel line slipped over the plug will aid in installation, without cross-threading the hole.

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WintrSol
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Re: Spark Plugs

Postby WintrSol » Sun Apr 15, 2018 10:02 am

JamesC wrote:What about fuel? Any difference between brands? I was going to gap a little more because I run premium. I know the handbook says 87 octane, but all my biker buddies go with the premium for some reason.

It will run best on 87, 89 will do in a pinch. Even better is to check out https://www.pure-gas.org/, your engine will love you for it, even if you can only get higher octane.
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JamesC
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Re: Spark Plugs

Postby JamesC » Mon Apr 16, 2018 5:58 pm

Okay, so I replaced my plugs yesterday. The front one was relatively clean, but the rear one, which was loose; was black with soot. Having the original Suzuki Spark Plug tool made all the difference. I was able to easily snug them down nice and tight, using "Never Cease" on the threads. She runs like a champ again. I don't know what you guys who don't have that tool use, but the 18mm deep socket by Craftsmen for 3/8ths drive does not work very well. You can snug them down, but then the socket gets stuck on the plug, and I wind up backing off to get it out. Anyway, I went for a nice ride and all is well again. Thanks.


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