Normal
The twin pipers of the larger persuasion that I knew were 360's. Way fast for their day. Good concept. Two plugs and two pipes had lots of people fooled when they first showed up. Greeves had some rigs that had the two exhaust ports, but they blended into a single expansion chamber. Possibly the last innovative thing that Greeves/Villiers did. I hope he has kept that critter. They have horrible electrics. A battery off of a rechargeble drill cleverly hidden will make it look like that one is running on it's original 'stuff'. there are two sets of points if it is still factory. you can make it work off of one set if you want.