Replacement Coils

dave · Sep 1, 2011

Thanks to Efzedaah
For this gem

Efzedaah said:

Well my bike has sounded like it has been 'missing' a bit recently, especially in rain, and I still had 1 spark plug to change so I got my tools together to give the ignition an overhaul.

I had a bit of luck with an '85 GSX400R when the basket wouldn't start. I ended up replacing the coils and leads for 1999 R1 items as these had very similar connections on the LT side and presto it went second time!

So for my 3LN3 I decided maybe the same trick might help out. I sourced a set of 99 R1 coils on ebay for quite cheap. Part number 4XV-00 J0313. They are a straight swap for the 3LN items - literally bolt for bolt and connector for connector! The only thing I wasnt 100% sure of was if the HT leads and caps would line up ok.

New coils as bought

Existing coils

R1 coils fitted in place - note white sealant to deter water ingress <img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" />

The old HT leads and caps were shot! 2 of the leads just popped out of the caps - 20year old originals maybe!!

One problem I did have is that the plug for cylinder number 3 didnt want to come out <img src="{SMILIES_PATH}/icon_Eyecrazy.gif" alt=":-?" title="Eye Crazy" /> The plug spanner just seemed to spin over the top. Really confused. I am sure this plug is the reason for the now much smaller amount of misfire that can be heard from the exhaust. God only knows how that plugs been left because it wont come out...........

The plug leads for cylinders 1 & 2 went in fine but 3 & 4 were a bit more involved. Because the R1 HT caps are much taller, they go much nearer to the thermostat housing and so have to be routed slightly different than normal. It all worked out good though.

So there - you can use 10 year younger R1 coils on your 3LN if you need to <img src="{SMILIES_PATH}/icon_bike.gif" alt=":-|" title="Bike" />

Chris
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dave Well-Known Member

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