EXPERT’S GUIGUIDEDE TO... FINE TUNING
What’s really involved in setting up a bike on the dyno? TT racer and dyno operator Dan Hegarty explains
A dyno is a machine which simulates how a bike is ridden on road or track. The front wheel is fixed; the rear drives a big roller. If an engine has been modified, experimenting with the ignition and fuelling can optimise its ability to turn and accelerate the roller, expressed as torque and power curves.
“We use a Dynojet 250i,” says Dan. “A dyno is useful because there’s no point in guessing with stuff. People obviously like it when they get a bike running better, but there’s so much more to a dyno. You can look at every variable: ignition, fuel mixture, RPM, speed, torque, gear ratios; you can also see clutches slipping. There are so many things you can put your finger on a lot quicker.”
The rear wheel spins on the roller, simulating a ride The front wheel is fixed to keep the bike stable The business end: This is where the running data is presented