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Old 07-17-2007, 03:35 PM   #1 (permalink)
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1987 EVO spark plugs? RN12YC okay?

Just pulled the plugs!!! Are Champion RN 12 YC plugs okay?
they are a little fouled. I'd like to put in new ones till
fall when I can do a top end rebuild.

Don't want to use Harley plugs for the time.

Kenny
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Old 07-17-2007, 03:43 PM   #2 (permalink)
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Quote:
Originally Posted by Red02FXST
Just pulled the plugs!!! Are Champion RN 12 YC plugs okay?
they are a little fouled. I'd like to put in new ones till
fall when I can do a top end rebuild.

Don't want to use Harley plugs for the time.

Kenny
thats what i use in my 85.
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Old 07-17-2007, 03:54 PM   #3 (permalink)
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Thanks for the help. I did check the website for Champion.
also could use N 12 YC. Plugs look to be oil fouled. Just bought
this bike with 40,000 miles. so thinking this fall will pull heads and
cylinders to look...see. will plan on valve guides, valves, seals,
maybe springs too and valve job. would like to go .30 over on piston
and new rings. Will do the work myself.

thanks,
Kenny
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Old 04-10-2011, 04:03 PM   #4 (permalink)
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these plugs are ****, i just had my bike worked on by someone else for the first time. they took out my harley 5r6a plugs and used these. my bike has been fouling at long red lights and hesitation when im rolling on at around 65 mph since he put these in.
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Old 04-10-2011, 05:15 PM   #5 (permalink)
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I've avoided Champions, in my cars, since 73, because of fouling.

joe
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Old 04-11-2011, 07:32 AM   #6 (permalink)
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RN 14YC's work the best in my 92 but the 12's work in the 97. Go figure.
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