Author Topic: Sidegapping Plugs ?  (Read 1211 times)

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Offline SteveD CB500F

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Sidegapping Plugs ?
« on: October 31, 2008, 07:21:56 am »
Anyone ever heard of / tried this?

http://performanceunlimited.com/documents/plugsidegapping.html

I'd be interested in the results (especially from our high performance brethren)
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2015 Tiger 800 XRT
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Offline Really?

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Re: Sidegapping Plugs ?
« Reply #1 on: October 31, 2008, 07:31:56 am »
I just read that link.  Showing the direction of the new spark, I t would prolly be a good idea to know it is pointing more towards the center of the cyl versus the cyl wall i guess.
I don't have a motorcycle, sold it ('85 Yamaha Venture Royale).  Haven't had a CB750 for over 40 years.

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Offline Trevor from Warragul

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Re: Sidegapping Plugs ?
« Reply #2 on: November 02, 2008, 02:57:19 am »
I did some research on this topic & the general opinion seems to be minimal difference, but the plug is more resistant to fouling.  As my Morini 3 1/2 likes to foul the rear plug (it either needs new valve stem seals or rings) I thought "What the heck, I'll give it a go!".  Well, I tried it on my NGK's, and the plug is definitely cleaner.  I need to take the bike for a bit of a run, then I'll report on my seat of the pant findings.
« Last Edit: November 10, 2008, 03:27:52 am by morini »
1971 Kawasaki H1A
1972 Honda CB350F
1976 Moto Morini 3 1/2 Sport
1978 Honda CBX
1997 Suzuki Bandit 1200
1999 Ducati Monster 750

Offline Trevor from Warragul

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Re: Sidegapping Plugs ?
« Reply #3 on: November 10, 2008, 03:29:57 am »
Well, I went for a longer ride & the rear plug is DEFINITELY cleaner (it is dark brown instead of oily black).  I'll stick with sidegapping..
1971 Kawasaki H1A
1972 Honda CB350F
1976 Moto Morini 3 1/2 Sport
1978 Honda CBX
1997 Suzuki Bandit 1200
1999 Ducati Monster 750

Offline Soos

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Re: Sidegapping Plugs ?
« Reply #4 on: November 10, 2008, 05:00:18 am »
I believe Pinhead is doing this on his high MPG cb60 build.

l8r


I tried sidegapping once, but I buggered 2 of the plugs up. Hit the center electrode post when  cutting the little arm to length.
So I never really got anywhere with them.

Have been running NGK iridium, and definitely not trying that on those.
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Offline City Boy

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Re: Sidegapping Plugs ?
« Reply #5 on: November 10, 2008, 05:09:50 am »
I like the theory.I am going to prepare a set for my 1100F for spring install.It loads plugs like crazy after lengthy legal speeds!Cobra had same probs.,installed DP8ES plugs to resolve.   Rock On
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