1990 evo plugs

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Mar 15, 2012 | 05:03 AM

#11

bikerlaw

Ultimate HDF Member

Joined: Jun 2007

Posts: 9,193

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From: Richmond, VA

Quote:

Originally Posted by omgtkk

I wouldn't put much value in reading the plugs on a bike that you just bought and has been sitting. Prior owner may have done nothing more than start it and let it idle every few weeks.
Change the plugs and all the fluids.

I agree. I like Champion RN12YC. Cheap and proven to last. Ride it a while, then read them. Maybe the last owner ran with the choke on all the time. Maybe its jetted too rich. Without new plugs to test the theory, you'd just be guessing. And make sure to put anti-seize on the plugs when you install them back in the heads.