Spark plug - resistor type required?

[freeportd]

My Honda BF30A specifies a ND X22ESR-U - which in a nutshell is

X - 12 x 18.0 thread diameter and hex size
22 - heat range, equivalent to 7 for NGK, 5 for Bosch, etc.
E - reach 19 or 20 mm for gasketed type
S - Non-projected (0mm projection)
R - with resistor
-U - U-cut ground electrode

I'm currently shopping for both my motorcycle and outboard at same time. At the motorcycle site, there's a X22ES-U plug available, but obviously it's a non-resistor type plug. Given that this will be on a boat with no radio or other electronics, how important is the resistor type?

By the way, the Denso site helps with the 'decoding' of their plug types: http://www.globaldenso.com/en/products/aftermarket/plug/spec/index.html

 

[hondadude]

Use the one specified by the manufacturer. In fact, they also recommend the DR7EA (NGK) plug. I would use the NGK over the Denso.

Mike

 

[jgmo]

Ah, but you DO have "other electronics". It's called the ignition control module. Electromagnetic interference COULD cause a malfunction there.

The link below has what NGK says on the subject.

http://www.ngksparkplugs.com/techinfo/spark_plugs/faq/faqresistor.asp

 

[justintime]

try the plugs that you want to use and tell us how the motor runs please