chief
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Posts: 7
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Post by chief on Dec 15, 2018 12:29:35 GMT -6
im puzzeled, no ignition on the left side (86 454) yet when I lift the wire off the plug slightly ( still arcing) then the pug fires. Why???
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Post by knoizy on Dec 15, 2018 17:06:10 GMT -6
Not sure if you are talking about ignition meaning the bike is running or just seeing a spark when starting but here's a few thoughts.
Are the contacts clean? Could be crud further up the plug cap that prevents contact and it only manages to arc when moved.
If you haven't recently trimmed the HT wire then do so, remove the plug cap then cut yourself a quarter inch (ideally up to where you see fresh copper) and screw the cap back in. This could also be faulty and only be making contact when moved.
Have you swapped the plugs around with any different results?
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chief
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Post by chief on Dec 15, 2018 23:50:00 GMT -6
Not sure if you are talking about ignition meaning the bike is running or just seeing a spark when starting but here's a few thoughts. Are the contacts clean? Could be crud further up the plug cap that prevents contact and it only manages to arc when moved. If you haven't recently trimmed the HT wire then do so, remove the plug cap then cut yourself a quarter inch (ideally up to where you see fresh copper) and screw the cap back in. This could also be faulty and only be making contact when moved. Have you swapped the plugs around with any different results? I'll look at that wire again, maybe change it. The bike was running on the right side plug ok, but when I raised the left plug wire a little bit where I could see the arc to the plug the idle smoothed out and rpm's went up. So ya maybe it was grounding out where I can't see it. I changed the plug and then it seemed fine, but now its doing it again a month later. Bike hasn't run much at all since I changed the plug. Thanks Tim |
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Post by Blaine on Dec 16, 2018 6:46:04 GMT -6
Dont forget the resistor in the plug cap.....They can get corroded up..I had one loose connection......Drove me nuts for a month till I found the problem.
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Post by fredriv on Dec 17, 2018 21:29:30 GMT -6
This can be due to a bad connection to the plug, due to corrosion within the boot. If it fires when you move the wire on the spark plug, then something's not right with the connection between the boot and the spark plug.
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chief
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Post by chief on Dec 22, 2018 13:04:34 GMT -6
Dont forget the resistor in the plug cap.....They can get corroded up..I had one loose connection......Drove me nuts for a month till I found the problem. Checked both resistors, they measure about the same resistance, clean all contacts / reassembled . no change . Swapped plugs and wires - no change. Recap- when I raise the left plug wire about 1/4 inch off the plug it then starts to fire and rpms pick up about another 300 or so. Checked coils and wire according to the book values and all is ok. Am I changing timming or something when raising the plug wire?? Missing something in my thoughts! I also took the entire wire and boot off and replaced it with a spare ignition wire from an auto (carbon type), nothing changed, sos , when raise the plug wire slightly the cylinder starts to fire! |
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Post by bikeman on Dec 22, 2018 19:39:14 GMT -6
that is a strange one that is. I'm assuming the right side works ok.
so you changed the plugs. no difference.
you changed the leads. no difference.
you changed the caps. no difference.
did you try changing the coils over. ?? if you did and found no difference I would say you had a deeper issue. with either the wire connectors or the triggers in the timing case. or a problem with the igniter.
one thing for sure if it's just one side where the issue is it's something grounding that side, lifting the cap off the plug produces a break in the continuity of that side.
that is to put it simply. it isolates that spark plug until there is enough energy to jump the gap and fire the plug.
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Post by eaglerider on Dec 23, 2018 6:04:28 GMT -6
Power wires to the coil on the right terminals?
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chief
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Post by chief on Dec 23, 2018 16:00:34 GMT -6
checked the power leads again today, sure enough positive wire to pos. terminal , both coils.
Swapped the coils today , no difference.
Engine runs and fires ok on the right side.
After trying all this today , the eng got up to operating temp. and started to run ok. I tried to make the prob. happen but it wouldn't. I'll see tomorrow when cold again.
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chief
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Post by chief on Jan 29, 2019 13:56:15 GMT -6
Well, its been a while but I've since changed the spark plug and also the high tension wire to the coil. Both cylinders fire correctly and the engine starts right up now, cold or hot. Apparently one of them was grounding out when cold. Bike runs fine now.
You guy's were right on track about the grounding out thoughts. The part about the cylinder starting to fire when I raised the wire off the plug a little boggled my mind .
Thanks to all for your input and suggestions
Tim
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Post by actionverb on Feb 1, 2019 22:06:54 GMT -6
Nice work on getting it fixed. I have mine so tore apart at the moment Im a little nervous about getting it all back together right. Have 3 months until the rain stops and I feel pinched for time!
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chief
New Member
Posts: 7
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Post by chief on Feb 5, 2019 15:32:20 GMT -6
Well, if you have any problems I'm sure you can fine the answer here. These guy's are great, lots of experience and willing to share it.
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chief
New Member
Posts: 7
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Post by chief on Apr 5, 2019 20:47:47 GMT -6
Nice work on getting it fixed. I have mine so tore apart at the moment Im a little nervous about getting it all back together right. Have 3 months until the rain stops and I feel pinched for time! |
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