Compression Tester

dlabkeeg

XS650 Addict
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I'm getting a compression tester, and need to know what size are the spark plugs in mm's? I don't have a metric tape.:doh: It's just a hair over 1/2". :eek:And don't look at me that way, before this bike all I ever worked on was old Chevy’s and Ford’s. :shrug: Yes, I'm buying a metric tape, when I get the compression tester. I'll be picking up my 2nd xs650 tomorrow. Haven't owned a bike 17 years, now I’ve bought two in two months. Might fix this one for my dad.
 
the sparkplug code... B = 14mm, see the NGK plug thread.... most compresson testers if worth buying will have different adapator ends to fit the various plug sizes
 
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