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1980 Honda CX500C, 2017 BMW S1000RR (Rebuilding), 2015 Honda CRF 250R
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6 Posts
Discussion Starter #1
Hello,

I was wondering what aftermarket Spark plug cap would replace the oem ones on my bike. Preferably NGK?
 

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1978 CX500 "The Grub", '83 GL650, '82 GL500 Project "AdventureWing", '79 CX500C, '78 CX500 Scrambler
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10,115 Posts
New old stock:
Aftermarket:
Or search for teh part number in eBay:
 

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22,012 Posts
NGK were OEM.

If you have resisters in your caps D8EA. If no resisters DR8EA or if you're feeling fabulously wealthy irridium DR8EIX - also a resister plug.
 

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'84 CX650E that is evolving into a GL500
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15,759 Posts
Honda specified resistor caps AND resistor plugs for some models. The resistors reduce RF interference and also have an effect on the spark but they seem to work OK with only one resistor instead of both. The one thing you do NOT want is resistor wires (basically carbon impregnated string) because they don't hold up well on bikes.
 

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I’m pretty sure I ordered non resistor caps from wemoto.
 

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Super Moderator
'84 CX650E that is evolving into a GL500
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15,759 Posts
They all came with resistor caps. All Canadian GL500s had resistor plugs and US models did too starting in '82, as did all GL650s. I imagine the CX650C TI CX500C would be the same.

Recommended Spark Plug Types from GL500/650 FSM
for CX/GL500/650

(1981)
Standard heat range
U.S. ND X24ES-U or NGK D8EA
Canadian ND X24ESR-U or NGK DR8ES-L
Cold weather (below 41f/5c)
U.S. ND X22ES-U or NGK D7EA
Canadian ND X22ESR-U or NGK DR7ES
Extended high-speed riding
U.S. ND X27ES-U or NGK D9EA
Canadian NO X27ESR-U or NGK DR9ES

(1982)
Standard heat range
U.S. and Canadian ND X24ESR-U or NGK DR8ES-L
Cold weather (below 41f/5c)
U.S. and Canadian ND X22ESR-U or NGK DR7ES
Extended high-speed riding
U.S. and Canadian ND X27ESR-U or NGK DR8EA
 
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