jmj166 Posted September 20, 2010 Share Posted September 20, 2010 hello, As I ordered new spark plugs for my 81 xs400 i used what was listed in the Haynes manual, BP7ES spark plug, and used Z1's spark plug guide to find the right spark plug cap to use, used this to get 2 LBO5F caps. here lies the problems...when i got these in, the spark plug caps wouldn't fit on the spark plug ends, then when i went to look at the bike i realized the spark plugs on the bike are BR7ES. So i was wondering if the Haynes manual is incorrect (since from what I've read through on other forums is that it sometimes is incorrect) and i should use BR7ES spark plugs instead of BP7ES. also, doesn't anyone know how to match spark plugs to spark plug caps so they fit correctly. thanks. Link to comment Share on other sites More sharing options...
chris66 Posted September 20, 2010 Share Posted September 20, 2010 have you unscrewed the cap on the plug ? Link to comment Share on other sites More sharing options...
jmj166 Posted September 20, 2010 Author Share Posted September 20, 2010 the caps on the spark plugs currently on the bike just pop off if you pull them, they dont screw on/screw off. I'm not sure if these sparkplugs were stock (as many things on the bike seem to be) or if they were later replaced with the caps. This is causing the confusion, i know this shouldn't be that big of a deal though, just wanna match the right plug (that i should be using) with the correct cap to get. Link to comment Share on other sites More sharing options...
chris66 Posted September 20, 2010 Share Posted September 20, 2010 if you ring up ngk they are very helpfull , i have rang them several times. chris Link to comment Share on other sites More sharing options...
Moderator drewpy Posted September 20, 2010 Moderator Share Posted September 20, 2010 hello, As I ordered new spark plugs for my 81 xs400 i used what was listed in the Haynes manual, BP7ES spark plug, and used Z1's spark plug guide to find the right spark plug cap to use, used this to get 2 LBO5F caps. here lies the problems...when i got these in, the spark plug caps wouldn't fit on the spark plug ends, then when i went to look at the bike i realized the spark plugs on the bike are BR7ES. So i was wondering if the Haynes manual is incorrect (since from what I've read through on other forums is that it sometimes is incorrect) and i should use BR7ES spark plugs instead of BP7ES. also, doesn't anyone know how to match spark plugs to spark plug caps so they fit correctly. thanks. the R in the plug designation means resistor type. yamaha service manual says; BP-7es NGK or N7Y champion they are always have a little post screwed onto the top, which needs to be removed before installing the plug caps which are rated @ 10Kohms Link to comment Share on other sites More sharing options...
chris66 Posted September 20, 2010 Share Posted September 20, 2010 the caps on the spark plugs currently on the bike just pop off if you pull them, they dont screw on/screw off. I'm not sure if these sparkplugs were stock (as many things on the bike seem to be) or if they were later replaced with the caps. This is causing the confusion, i know this shouldn't be that big of a deal though, just wanna match the right plug (that i should be using) with the correct cap to get. there are little chrome coloured screw on caps on the plugs themselves that have to be removed before pushing on the ht cap Link to comment Share on other sites More sharing options...
barkwindjammer Posted September 20, 2010 Share Posted September 20, 2010 Its the bit the nice lady is pointing at Link to comment Share on other sites More sharing options...
chris66 Posted September 20, 2010 Share Posted September 20, 2010 great illustration barkwindjammer, you have shown the bit i am trying to describe in one picture well done. chris Link to comment Share on other sites More sharing options...
jmj166 Posted September 20, 2010 Author Share Posted September 20, 2010 Its the bit the nice lady is pointing at probably the best illustration for something mechanical i've seen in a while. I will check it when i get home and if i remember take pictures if theres any more confusion. appreciate the help. Link to comment Share on other sites More sharing options...
Moderator drewpy Posted September 21, 2010 Moderator Share Posted September 21, 2010 probably the best illustration for something mechanical i've seen in a while. I will check it when i get home and if i remember take pictures if theres any more confusion. appreciate the help. don't forget the naked lady Link to comment Share on other sites More sharing options...
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