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

Motorcycle News (UK) - - Garagae - Dan He­garty is the owner, en­gine builder and dyno man at RTR Mo­tor­cy­cles at Bing­ham, near Not­ting­ham. He’s also a very fast road racer: last year he won the TT Pri­va­teer Cham­pi­onship.

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

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