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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 11-21-2008, 08:55 AM   #1 (permalink)
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Angry ignition coils??

Hey Fellas,

can anyone tell me why my bike seems to run **** house after warming up??

i am running a boyer electronic ignition (2x6v coils......brand new) and im only getting one side with good spark??

Who is selling the best quality coills?? I have heard reports of even new asian coils playing up.

After approx 5 minutes of running she seems to miss-fire and run on the one cylinde!!!

No loose wires etc but something is not right.

running brand new plugs and timing is all good!!

Cheers fellas.
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Old 11-21-2008, 09:21 AM   #2 (permalink)
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There is no doubt that the best made and most reliable coil is the LUCAS original.
If you see any on E-Bay as NOS BUY THEM
The German Coil was always suspect and the Taiwan one marginally better, but I have had both fail. I have 30 year old Made in England Lucas coils which still function perfectly.
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Old 11-21-2008, 04:44 PM   #3 (permalink)
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VB,
The coils are wired in series, so if one primary goes open circuit, the other will not fire as well. If one primary goes short, the other one will follow in short order, as it will have 12V across a 6V coil. Therefore, probably not the coil primary windings. Coil secondary windings are fairly hardy, unless the coild has been knowked about, dented, dried out, etc.

I'd be tending more towards plug leads (should be copper wire core - not supressor leads), or the plug fouling on one side (burning oil or very rich), or the plug itself breaking down (yep, new ones do it). Where the leads plug into the top of the coils can also come adrift from vibration.

Check the plugs after it commences running on one cylinder. Swap the leads between cylinders, and see if the fault changes to the other side.

Pete
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Old 11-21-2008, 06:21 PM   #4 (permalink)
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I have no experience with them but I've heard that Boyers are sensitive to low voltage. How's your charging system and battery?
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Old 11-22-2008, 03:28 AM   #5 (permalink)
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Cheers Pete,

Sorry to read about your accident last month. I hope your gonna get back on your bike!!

Leads im running are copper core.

I have a battery fighter charging unit on my battery so when it's not getting used its getting trickled charged so i'm thinking that maybe not the battery.

Both plugs were extremely sooted up after a short ride (the new plugs). I did notice that one of the plugs was not as sooted up as the other and that this was probably the good side!!!!! The other plug looked like it would have a hard time sparking.

Also, i did take the plugs out and kick the bike. I noticed that one plug wasnt sparking and the otherside was.

I'm running BP7ES plugs.

I still have another 2 brand new 6v coils which i can try and see if i come up with the same result!!!

I will also check the spark leads??!!!???
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Old 11-23-2008, 01:07 AM   #6 (permalink)
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Thumbs up Ignition coils

I've always heard that if you think it's ignition, it's the fuel system; and if you think it's the fuel system, it's the ignition.

But, what is your bike? Any mods?

As was pointed out earlier, with a Boyer the coils are in series, so if one is failing, neither cylinder would fire. You said the plugs were sooty, which points to possible HT wire or fuel issues. OK, one was sootier than the other. See the preceding.

Have you done a compression check? Valves adjusted correctly?

Why is your battery on a charger when you're not riding? That's suspect in my book.
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Old 11-23-2008, 06:53 AM   #7 (permalink)
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El Tejon thats a good philosphy. Maybe it is the fuel. I did have an issue with one of the carbys having a sticking issue with a slide. i think the carb body might of had a knock and the slide wouldnt do its thing. lucky i wasnt riding the bike when it stuck open.

I had a spare amal lying around so i replaced it.

compression seems fine as my ankle is still recovering after a failed kick start attempt!!!!!!!!!! As for the valves, before my sooty issue the bike ran and pulled very smoothly.

i use the battery fight to give the battery a little bit of pick me up. Apparently the Boyers like a bit more juice. i dont think the battery is suspect.

Today i replaced the coils (brand new), replaced the spark plugs but the rain beat me to the test ride. I think if the soot comes back then its the fuel!!!!

By the way, the reason i havent mentioned my bike type as it's not my Triumph!!!! My triumph is still not ready after years in the making,.....it's the Norton !!!!!!!

I may have just opened myself up for some punishment!!!!!!!!
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Old 11-23-2008, 01:17 PM   #8 (permalink)
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Bummer rain.

Hey, I spotted the problem.
You've got a Notrun.

Seriously, nice ride.

How old is the battery? What is its voltage after being off the charger for 5+ hours? Anything less than 126V and it's punk.
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Old 11-23-2008, 01:32 PM   #9 (permalink)
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My first Norton was the blue flake. It looks super. Have a 71 Commando in red now. Great bikes. I have a couple of those air cleaners in my stash from SU days. How did you modify and/or attach them to the carbs. Are you running one or two cleaners??
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Old 11-23-2008, 01:48 PM   #10 (permalink)
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On the bike problem, you say you are recovering from kicking her over. If she is kicking back, your battery is bunko. Mine just went belly up after 5 1/2 yrs. She kicked me about 5 times and was a bugger to fire up. This going from her usual one kick wonder.The Boyer does like good juice to perform properly. Get a good size battery, I run a 16CL-B which has about 300 ccc. It fits perfectly in the battery tray. If you have not already done so you have to correct the Boyer wire problems at the pick up point. The wires are loose in their connection terminals and come loose from the circuit board. The circuit board has to be drilled and some 4 or 6 /32 screws used to make a good connection. I had to do both fixes to mine at different times. Also make sure the wires coming out and going to the coils have enough slack to account for engine vibration.
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