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Before my Seeley Commando had a Norton motor, it was a Seeley Laverda 750, and I had raced my Triton 500 against it in a club event. I noticed that it had a 2 into 1 exhaust systemwhich had a tail pipe which was too small. But because I was racing against it, It did not mention that to the guy who owned it. I blew that bike to the weeds down the back straight at Winton, but I noticed how it handled. I followed it around for about 2 years until I was eventuaslly able to buy the rolling chassis, but I could not get the motor. If you have a look at the photos of the 750 SFCs, the factory used to race, you will see the cross in the exhaust system which is under the motor. The 750SFC Laverda has a 180 degree firing motor - NOT 360, so the tail pipe does not resonate at twice the frequency of a header pipe. Each header pipe is able to exhaust into either muffler. So the back pressure is less.I think one of Paul Dunstall's exhaust systems also used to do that. The 2 into 1 exhaust system on my bike is much too loud, but it works. And it only has one muffler.
Before my Seeley Commando had a Norton motor, it was a Seeley Laverda 750, and I had raced my Triton 500 against it in a club event. I noticed that it had a 2 into 1 exhaust systemwhich had a tail pipe which was too small. But because I was racing against it, It did not mention that to the guy who owned it. I blew that bike to the weeds down the back straight at Winton, but I noticed how it handled. I followed it around for about 2 years until I was eventuaslly able to buy the rolling chassis, but I could not get the motor. If you have a look at the photos of the 750 SFCs, the factory used to race, you will see the cross in the exhaust system which is under the motor. The 750SFC Laverda has a 180 degree firing motor - NOT 360, so the tail pipe does not resonate at twice the frequency of a header pipe. Each header pipe is able to exhaust into either muffler. So the back pressure is less.
I think one of Paul Dunstall's exhaust systems also used to do that. The 2 into 1 exhaust system on my bike is much too loud, but it works. And it only has one muffler.
