When mine was dynoed it was just a current reading clamp that went arround the HT lead

hunter wrote:Smev,Yellow wire to orange on the coil.Mines on an inline engine,not a vee,but that don't matter.

A thousand 'Thank-yous' Hunter

I'll be trying this just as soon as I can.

porndoguk wrote:When mine was dynoed it was just a current reading clamp that went arround the HT lead

Cheers Mate - that sounds simple enough -

This was done on a hot day in the summer and with a knackered chain and sprocket and dirty air filter.

Standard bike apart from Blue flame end can.