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Ryland · 07-01-2011, 04:16 PM

They need to have the same thread size, reach, heat range and some have variations that you need to match up.
Your Civic EX takes NGK plug number ZFR5J-11

Your CRX HF takes NGK plug number BCPR5E-11

http://www.ngksparkplugs.com/techinf...tnumberkey.pdf

Judging from that plug number decoding... they will not work well even if they did fit.

07-01-2011, 04:16 PM	#5 (permalink)
Ryland Master EcoModder Join Date: Jan 2008 Location: Western Wisconsin Posts: 3,903 honda cb125 - '74 Honda CB 125 S1 90 day: 79.71 mpg (US) green wedge - '81 Commuter Vehicles Inc. Commuti-Car Blue VX - '93 Honda Civic VX Thanks: 867 Thanked 434 Times in 354 Posts	They need to have the same thread size, reach, heat range and some have variations that you need to match up. Your Civic EX takes NGK plug number ZFR5J-11 Your CRX HF takes NGK plug number BCPR5E-11 http://www.ngksparkplugs.com/techinf...tnumberkey.pdf Judging from that plug number decoding... they will not work well even if they did fit. Last edited by Ryland; 07-01-2011 at 04:29 PM..