Cables for the Zeeltronic pickups and neutral switch exit through a grommet


Ignition module above, lithium battery below. I made up a rubber retaining strap


Bespoke frame, Kawasaki AR50 front bits, dummy headlight based on a mixing bowl

Darren’s RD400 drag racer

Believe it or not this bike started life as an RD400 Yamaha. The crankcases are original, and the cylinder heads were¬†too until owner Darren machined the fins off¬†(drag racers don’t run for long enough to need cooling).

Darren is a very seasoned drag¬†competitor and he had just rebuilt the bike to be as good as he can make it. It had already done a 9.96 second quarter mile at a terminal 129mph. The world record is around 9.5, so¬†he hopes a custom Zeeltronic ignition will get him a bit closer. It’s got programmable limits for¬†tyre burnout, start line rpm and launch rpm. It can also switch between two ignition maps on the line, with up to ten maps available when connected to a laptop. A big shift light reminds him to change up (it’s a three-speed gearbox), and gear changes happen via an air shifter button on the left bar, again with tunable¬†ignition cut.

With lots of sensors, light and switches Darren wanted a neat loom that could withstand the rigours of racing. So it’s fairly easy to remove and re-fit, and difficult to plug the wrong things together. Darren was very pleased with how¬†tidy it looked.

coils better

Ignition coils, plus plugs for various sensors

from above

Ready to rock. When Darren breaks the world record you’ll hear about it here