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Mmmmoto
Posted on Sunday, October 21, 2012 - 11:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have been going over my new (to me) S2 and found that it has dual (spark) plug heads on it. However, only one plug has a spark plug wire going to it for each cylinder. It seems to run good.

It this a problem? It seems to me that both spark plugs should be firing in order to have this beauty run right.

What do I do? Help!
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Ratbuell
Posted on Sunday, October 21, 2012 - 10:08 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Dual plug heads are aftermarket.

Depending on what coil/ignition you have, you may not be able to fire four plugs.

It is possible that a PO put on dual plug heads, but left the stock (2-plug) ignition on.
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Stev0
Posted on Sunday, October 21, 2012 - 10:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

HD had dual plug heads on the 1200S sportster from '98 on. They were also in their Flaming Chook catalogue.

Using one plug as a blank is fine, if you fire both then you're effectively increasing your advance.
If it runs OK, then I'd leave it.

you could also put 4 fresh plugs in and try just firing two but try each one and see if it makes any difference
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Buellish
Posted on Monday, October 22, 2012 - 10:20 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

A machine shop can dual plug stock heads.I've had this done a couple of times in the past.
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Ratbuell
Posted on Monday, October 22, 2012 - 09:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I guess I should have been clearer.

Dual plug heads were not stock for any S2.
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Sportyeric
Posted on Tuesday, October 23, 2012 - 02:37 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

As mentioned, the heads probably came off a Sportster Sport and will have a the same design as S1 Lightning heads but with an extra sparkplug that really is just a marketing gimmick. Without spending a fair bit of money buying an aftermarket ignition that will provide dual plug spark (coils and all), you don't need to do anything. Although I wonder if carbon buildup on the non-firing plug might become an issue and whether it would be better to try to find a bolt of appropriate length and thread pitch to replace it.
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Mmmmoto
Posted on Wednesday, October 24, 2012 - 10:32 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks for all of your responses. The heads were purchased new in June 1997 by the previous owner (for $995) and put on the bike when he had about $9k of engine work done (Axtell big bore kit, new rods, trans gears done, etc.) The bike runs great and has BIG power, so I will simply take the extra plugs out and find bolts of suitable length to plug up the holes. Thanx!
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Stev0
Posted on Wednesday, October 24, 2012 - 08:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

There is specific blanking plugs available.. Although where you'll find them I'm not sure.

The SE version of those heads came with two of those plugs so you could use the heads in either configuration.

They need to seal in the same way that a plug does, so be carefull just using a bolt.
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