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Old 05-13-2012, 06:42 PM   #1
zenduddhist OP
Gnarly Adventurer
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Joined: Jul 2010
Location: Ohio
Oddometer: 153
1975 R90/6 Spark Plug Recommendations

What spark plugs do you guys use in the R90/6?
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Old 05-14-2012, 09:35 AM   #2
Joined: Jun 2011
Location: cincinnatus oh
Oddometer: 87
Bosch W6DC - not WR6DC

NGK BP6ES is what I have in my R90.

Checked the 4 Advance Auto Parts by me. 1 had the Spark Plugs in stock. under $5 a pair
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Old 05-14-2012, 09:54 AM   #3
I Miss the PartyBoss
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Joined: Jan 2004
Location: Ringgold, Ga.....Saaalute!
Oddometer: 5,934
I run Autolite 63 in mine, plentiful and cheap................

"I aint no ruff guy, aint no tuff guy. Don't get out much, and don't dress up fly"
BMW's: 1999 GS 1100 "Work Horse", 1975 R90/6 "Black Betty", 92 R100 GSPD,
03 XR 650L with Farkles, KLR 250, 72 Honda CL-70
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Old 05-14-2012, 11:50 AM   #4
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Joined: Aug 2010
Location: Las Cruces, NM
Oddometer: 1,156
Originally Posted by pkboxer View Post

NGK BP6ES is what I have in my R90.
+1 on the NGK BP6ES.
ABC #12947
'75 R90S
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Old 05-14-2012, 12:58 PM   #5
because I can
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,830
I think they all run better with Bosch 7's over 6's. I run my airheads harder than anyone I know and I think 6's are too cold. I have run 7's in ton's of customer bikes. They run cleaner for it.
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