Charon
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If the EPA actually paid attention, those custom exhaust systems are just as illegal as rejetting. Any modification which increases the noise level, whether an exhaust modification or an intake (air box) modification, is illegal for on-road use. Any modification which increases emissions is illegal. Removing the idle screw plug is illegal, even if you don't change the setting. The "white spacer mod" is illegal. Dealerships will tell you they can't adjust the carburetor, and blame it on the EPA, and they will be correct. They will NOT tell you the EPA forbids exhaust modifications, because they stand to make money selling the custom pipes and charging labor to install them. They know if they won't install the custom exhausts their customers will go to some independent mechanic who will - even though it is just as illegal for the independent mechanic.
In my opinion the reason dealerships don't sell a lot of S40s is money. It is a low priced motorcycle, so there isn't as much markup. There are not a lot of accessories marketed for it. That's because accessories tend to be priced the same, no matter what motorcycle they fit. People aren't going to put $2000 worth of accessories on a $4300 bike, even though they will cheerfully do it on a $15000 bike. The accessory makers know that, so they don't bother making the accessories in the first place. Instead, they go for the Harley market, where the same accessories fit lots of models, and where a LOT of bikes were sold.
The same problems exist for other low-priced bikes, such as Kawasaki's 125 Eliminator and 250 Ninja, Honda's 250 Rebel, Suzuki's GN250, Yamaha's 250 V-twin (Star?), and no doubt others. Even if accessories exixted, people are more likely to trade up into a bigger bike (on which the dealership makes its profit) than to buy accessories.
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