Topic: Spark plug question - Autolite 4164

[neudl]

I was a Schucks recently and decided to purchase new spark plugs for my ’72 CB500.  They didn't carry NEK D7EA plugs, but the guy told me the Autolite 4164 would work.  At the same time I replaced the plugs, I adjusted tappet clearance, timing, synched the carbs, sealed the tank with Por-15, and ditched the inline fuel filter.  After all of this the bike ran much better, but would bog a bit and pop out of the no. 3 exhaust.  After going over everything, I bought some NEK D7EA plugs and threw out the Autolites, and so far, the bogging an popping is gone.  So – my question is whether the man behind the counter was right.  Were the 4164s the problem?

[TwoTired]

The Counterman's definition of "work" was that they had the same threads and physical appearance for installation.  Autolite 4164 plugs are resistor plugs.  NGK D7EA is a non-resistor plug specified for your engine.

Experiences like these are why I have an intense distrust for parts counter men.  They are paid to sell merchandise in stock, not for making your machine operate correctly.

It also seems that the more bravado, confidence, and assertiveness they exude, the less likely you'll get the right part.

Cheers,

[neudl]

Thanks TT - I knew you would have the answer. 

[TwoTired]

To be thorough, I should add that the spark plugs were A problem, but I can't say for certain it was THE problem.  It's certainly possible through.

Cheers,