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Lack of clearance for coils - 650
#796258 01/22/20 7:01 am
Joined: Nov 2002
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I am trying to fit an export type tank to a 66 frame. Its an Indian tank and the cutouts underneath are not as wide or deep as the tank which was on it. Are there any work arounds for this? I have Boyer ignition so I believe the coils must be insulated from the frame. I was going to rig up another bracket but to move them in means the coil body could touch. Are there any solutions people have come up with? I have searched for some smaller 6V coils without success so far. This is really annoying!!


1966 Triumph Thunderville
1970 TR6C
1972 TR6C
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Re: Lack of clearance for coils - 650
tiger_cub #796265 01/22/20 9:28 am
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I use Boyer on a 500 and my coils aren't insulated. Just metal clamps around the metal coil bolted to the frame with metal bolts.

I think you'll find that as long as the coil terminals aren't touching the frame, all will be well. The coils are internally insulated. One primary coil separated from the secondary inside the metal tube with some resin or something. Most have a plastic or Bakelite top that keeps the input and output end of things away from each other.

You don't need to put the coils under the tank necessarily. They can go under the seat can't they? Hide the Boyer in the tank cavity perhaps.


'51 C11 in a '54 C10L frame. Back on the road...
'70 Triumph Trophy 500. Next on the bench for a refresh!
'72 Triumph Tiger 650. Back on the road...
Re: Lack of clearance for coils - 650
tiger_cub #796268 01/22/20 9:49 am
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Thanks, its just that what it says in the Boyer instructions. I think I have devised a way to mount the coils, see how we go in a few days.


1966 Triumph Thunderville
1970 TR6C
1972 TR6C
Re: Lack of clearance for coils - 650
tiger_cub #796273 01/22/20 10:32 am
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The problem with the cases touching is not initially an issue but later on when the vibration causes them to rub and the case either be compromised with a hole or internally creates a contact between the internal coils and the case. The Commando is hard on coils with its mounting brackets, they distort the outer case and you get the coils shorting to the case and hence no spark.

Re: Lack of clearance for coils - 650
tiger_cub #796335 01/22/20 10:33 pm
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I think it doesn't help in that I have the ET coil brackets with the coils bolted to them on a round clamp. The ET coils are smaller and would fit, I'm sure the tank isn't the issue, in fact I'm pretty happy with it for $200 shipped. As I mentioned, I think I have a solution which will be to mount them sideways on a thick rod using the existing clamps. I will add some insulation anyway to make sure they don't hit the frame.


1966 Triumph Thunderville
1970 TR6C
1972 TR6C
Re: Lack of clearance for coils - 650
tiger_cub #796373 01/23/20 9:31 am
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A bit of push bike tube stretched over the cylinder of the coil will get you where you need to be.


'51 C11 in a '54 C10L frame. Back on the road...
'70 Triumph Trophy 500. Next on the bench for a refresh!
'72 Triumph Tiger 650. Back on the road...
Re: Lack of clearance for coils - 650
tiger_cub #796696 01/27/20 1:15 am
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Re: Lack of clearance for coils - 650
tiger_cub #797092 01/31/20 5:30 am
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All sorted, not much clearance on these small tanks but I mounted the clamps onto a rod through then original lower mount bracket and put bike tube over the large flanges on the coils to make them flush with the frame tube. I also made sure none of the terminals stuck out towards the tank or frame. Tight fit but functions OK. Also means I have a spare set of ET coild brackets for my TR6C!


1966 Triumph Thunderville
1970 TR6C
1972 TR6C
Re: Lack of clearance for coils - 650
tiger_cub #797099 01/31/20 9:03 am
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.....and onto the next little challenge. Glad you got it sorted.


'51 C11 in a '54 C10L frame. Back on the road...
'70 Triumph Trophy 500. Next on the bench for a refresh!
'72 Triumph Tiger 650. Back on the road...

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