Charon
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Don't count on solving "popping" on deceleration. If you look a little you will find a lot of bikes with fuel injection and some sort of air injection mechanism in the exhaust, as well as forums asking how to remove it.
I have a 2007 Yamaha Majesty 400, which is fuel injected. At low altitudes it is quite docile and quiet. But I took it across Trail Ridge Road, and it does quite a bit of popping on deceleration at high altitudes. Ran just fine otherwise.
Some bikes retain the old carburetor for use as a throttle body, and I suppose they could mount the injector in there as well.
It is pretty usual for fuel injected bikes to mount the fuel pump in the tank, where it can be kept cool by being submerged in fuel. The fuel petcock usually goes away, and so does the reserve. Instead you get a "Low Fuel" light, which on the S40 could perhaps go where the old "Check Sidestand" light used to be.
Another fun "quirk" of fuel injection is the shutting off of fuel on deceleration. This works quite well at reducing emissions, as with no fuel there are no emissions. But there is a transition when the throttle is opened, or when the engine reaches some predetermined speed just above idle. It goes from no fuel at all to fuel at some mixture that will burn, and this often results in a jerky throttle transition just as the throttle is moved. It feels like a lot of drive train lash. It happens with cars, too, but power-to-weight is a lot lower and you don't notice it especially with automatic transmissions and torque converters.
I guess, along with all the jetting threads for older machines, we'll now have threads on how to program the injection and which version of Power Commander to buy.
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