Topic: CB350 four spark plugs

[csiress2]

I have seen on SOHC4 tuning specs that the plugs are NGK D8ESL and in one of the discussions someone specified that the D8EA replaces the D8ESL.  But on David Silver Spares page it sayes NGK DR8ESL.  And I have called a local auto store and they sayed NGK 2120.  So which is correct?

I am also looking for plug wires, so if someone could direct me to a source for those and the plugs that would be fantastic.

Thank you

Craig II
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[TwoTired]

2120 is the NGK stock number for the part number D8EA NGK spark plug which is correct for a CB350F.

http://www.ngksparkplugs.com/apps/motorcycles/make4.asp?id=1101&type=reg

DR8ESL is a resistor plug, and will work in your bike, but are not, technically, the correct plugs if you are still using the stock resistor plug caps.
You may experience shortened plug life and effectiveness using these plugs with the stock ignition coils, but it won't hurt anything.  The extra resistors lower the spark voltage margin provided by the stock coils and ignition.  This comes into play when the plugs approach end of life where they require more voltage to fire with vigor.  You will likely have to replace them at shorter intervals than the correct spark plug without resistors.
However, if you change to non-resistor spark plug caps, the plug life is equivalent.

Your choice.

Cheers,

[csiress2]

Thank you for your info.  Now that I have a source for the plugs, all I need is 4 plug wires.

Craig II
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