Where to buy spark plug caps?

Alex A · World Chat Champion Joined: 05 Mar 2007 Karma :

Pretty sure one or two of the plug caps on my '92 GSXR750WN are past their best. One in particular won't screw securely onto the relevant HT lead and seems to be shorting/losing signal, causing one of the cylinders to intermittently misfire. I've already replaced the spark plugs and taped the caps up in case they were shorting on the cylinder head but that hasn't resolved the issue. So new caps is the next step.

Having had a quick search on wemoto and a few other sites, I can't seem to find new OEM caps for this model anywhere. Would aftermarket non-model specific NGK caps work (if so, which?), or do I need a model-specific aftermarket type? And where can I get hold of the right thing?
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Current: Ducati Panigale R / Ducati Streetfighter S / Suzuki GSX-R1000 L5

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

I think that a spark plug cap is a spark plug cap, unless they have coils etc built into them, or are designed to be waterproof etc.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

Alex A · World Chat Champion Joined: 05 Mar 2007 Karma :

Well, the stock ones do have rubber washers on them to stop water getting to the plug but I could put those washers onto another cap easily enough.

They have what I'm fairly certain are these at my local dealer (for £4 a piece). Am I right in thinking these should work?
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Current: Ducati Panigale R / Ducati Streetfighter S / Suzuki GSX-R1000 L5

Alex A · World Chat Champion Joined: 05 Mar 2007 Karma :

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

The caps you show there will work fine.

Also, trim the HT leads back about a centimetre to make sure you get fresh copper.

When you do this the caps will need a fair bit of force to screw intot he leads, dont be timid.
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Some shite cruiser. Now with guns and FREEDOM!

Alex A · World Chat Champion Joined: 05 Mar 2007 Karma :

Sorted, thanks gents.

Ended up fitting some NGK competition plug caps which are all rubber encased and look more durable and flexible (helpful given the tight spaces under the cradle frame) than the plastic ones. The original water seals fit over them just fine too.

Problem solved after the third strip down and rebuild! I just hate problems that only present when under load.
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Current: Ducati Panigale R / Ducati Streetfighter S / Suzuki GSX-R1000 L5