The exhaust reverse cone megas arrived today, I'm really pleased with them, seem to be very well finished. They came with a simple mounting bracket that would be too long no matter where they end up being fitted, so one job today was to make a couple of the temporary brackets with lots of holes so I can try different positions for the megas. So I made them quickly and simply from a scrap piece of alloy, no need to be any better as they'll be replaced with something much neater..
Making the tempory brackets
That done, next job was to mount the coil under the tank. I marked out, punched and drilled a couple of mounting holes in the head steady. It places the coil quite close to the front cylinder head, but raising it up an inch or so would've kept it out of the air flow.. swings and roundabouts.. so I decided on the lower option in the end.. The coil is an aftermarket 3 ohm single fire unit (effectively its two coils in one), std Harleys use duel fire coils, with both spark plugs firing at the same time. Single fire is supposed to give a small performance gain, and at least my spark plugs should last longer. I'll be fitting a matching electronic ignition, which fits neatly in place of the points. Points ignition use a 5 ohm coil usually, which gives a weaker spark than a 3 ohm coil that modern ignitions can handle..
Engineers blue, helps to mark out where I need to punch a guide mark prior to drilling
All done..
To make a start on the exhaust downpipes, we made these collars in stainless, they are stepped inside, so they slide tightly over the exhaust tubing (to be welded), and over the engine exhaust stub. I preferred this method, rather than finding someone to expand the end of the tube, because I don't know yet which tubing I'm going to use at the moment..