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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust Components
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<blockquote data-quote="greg brillus" data-source="post: 61449" data-attributes="member: 597"><p>How do they conduct your sound level checks....? Here they use to check by holding a sound level meter about 1 meter behind the exhaust pipe and get you to free rev the engine to say 4000 rpm. Now they check at locations around the track at a distance of 30 meters from the track surface, but mostly at the start/ finish line which is usually the main straight where you are on full throttle. Only track I have had an issue at is Lakeside which is just north of Brisbane city here in Queensland, and their track limit is 95 db at the track, measured right at the start/finish line. At first I went to a lot of trouble to keep the exhaust quiet, that's why I went to a two into one system with a big muffler....turns out I was way over the top.....Bike put out less noise than a standard Rapide. When I went out on the track, they all said...."We can't hear you" take that ruddy muffler off so we can hear it. So I just worked back from there. The exhaust was a work of art...although Davidd did warn me of the system bottoming out on corners. Being such a novice rider, I guess initially I wasn't pushing it that hard in the corners, but I soon realized that my opposition was flying past me about 1 second per corner, now I am trying harder, I have found the exhaust hit the track surface, and I actually felt the back wheel skip out.....that was enough warning for me. I think the suspension had sagged slightly as well, so I have set it up again to help give more clearance under the engine...remembering I am only using one spring each, at the front and rear, which is probably working quite hard given the springs are not that big. But I may be able to do something about that later on.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 61449, member: 597"] How do they conduct your sound level checks....? Here they use to check by holding a sound level meter about 1 meter behind the exhaust pipe and get you to free rev the engine to say 4000 rpm. Now they check at locations around the track at a distance of 30 meters from the track surface, but mostly at the start/ finish line which is usually the main straight where you are on full throttle. Only track I have had an issue at is Lakeside which is just north of Brisbane city here in Queensland, and their track limit is 95 db at the track, measured right at the start/finish line. At first I went to a lot of trouble to keep the exhaust quiet, that's why I went to a two into one system with a big muffler....turns out I was way over the top.....Bike put out less noise than a standard Rapide. When I went out on the track, they all said...."We can't hear you" take that ruddy muffler off so we can hear it. So I just worked back from there. The exhaust was a work of art...although Davidd did warn me of the system bottoming out on corners. Being such a novice rider, I guess initially I wasn't pushing it that hard in the corners, but I soon realized that my opposition was flying past me about 1 second per corner, now I am trying harder, I have found the exhaust hit the track surface, and I actually felt the back wheel skip out.....that was enough warning for me. I think the suspension had sagged slightly as well, so I have set it up again to help give more clearance under the engine...remembering I am only using one spring each, at the front and rear, which is probably working quite hard given the springs are not that big. But I may be able to do something about that later on. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust Components
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