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No spark on my 75 CB550F

2266 Views 18 Replies 5 Participants Last post by  joe c
Howdy...hope someone can help me out.

I don't have spark on my CB550F. I bit of history on the bike; I just got it last weekend from this guy who said that he was changing the handle bars and once he finished he couldn't get it started. A buddy on mine just came over this morning to look at it...checked the usual suspects; points (good), battery (new), plugs (good condition). Electronics was his kryptonite so he couldn't figure out why I wasn't getting any spark.

I lights and horn work so I don't think its the battery. I just checked the birds nest of wires behind the headlight and everything seems to be in order, I did find a brown female connector without a partner but according to my Clymer brown is for the taillight and that works just fine.

I was trying to find a thread for this on the forum but nothing was working...can anyone offer help? Thanks.
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Thanks for the reply, I took open the kill switch and found that the wires attached to it look good...i mean that it looks like the wires are still soddered on to the little circuit board, how do i know that its not working right? Is there tell-tale signs that its broken?
I'VE GOT SPARK! Thanks everyone for helping me find the problem and teaching me how to fix it. With the help of my $2 test light and following the the advice from all you folks, I had isolated the problem which was on the kill switch which wasn't completing the circiut. I hot wired it through the headlight by connecting the black/white wire with the black wire and vroom vroom I can turn the engine over.

Thanks again ya' that I've got the engine going I can see that there are other things I need to work on but let me cruise the site so that I don't ask the same question somebody else did, but I'm stoked to fix this victory at a time...
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