Add catalytic converter to a motorcycle?

[JSH]

Originally Posted by TurnNBurn

I looked on my exhaust and what I thought was a "resonator" is indeed a cat. Sure doesn't seem like it's doing its job. My backpack and I stink after a ride.

What do you stink like? (Fuel, Oil, ???)

Your bike is fuel injected and has a catalyst so you shouldn’t smell. The exhaust will smell a bit after start-up but that should go away once it is warmed up. I’ve never stunk after riding even will older bikes ((my bikes range from 1976 to 2011). Something has to be wrong with the bike.

Do you have any smoke visible from the exhaust? Do the plugs look OK? Is the coolant level OK? Has some installed a power commander and screwed up the fuel mixture?

How long have you owned this bike, how many miles on it?

[redpoint5]

Do fuel injected bikes have O2 sensors both pre and post cat?

The OP is a mile high, and my understanding was that the bikes have static fuel maps that don't adjust to changing air density.

Another question is what octane fuel is being used? Plenty of people report unburned fuel smell when they use premium fuel in a bike not designed for premium. I run regular in my CBR600, because that's what it was designed for.

As far as reasoning for adding a cat to a motorcycle, smog is a local problem. If the locality does not suffer a smog problem then I see no reason to get poorer fuel economy and higher CO2 emissions to reduce a local and short-lived pollutant that isn't a problem.

[JSH]

My 2002 BMW had O2 sensors and my 2011 does as well. I can't find an O2 sensor for the 2007 Honda CB919 but a quick call to his local dealer could determine that. (I might not be looking in the correct place on the Parts fiche)

I did find an Air Control Valve. I'm not sure if that is for idle air control, or to inject fresh air into the exhaust to reduce NOx. Either way if it isn't working (Or someone removed it) the bike won't run right.

TurnNBurn - Is you bike a California model? If so it should have a EVAP canister. If someone removed it incorrectly that could also cause problems.

[cRiPpLe_rOoStEr]

Originally Posted by Stubby79

You could also find one for a Geo Metro, which has a similar sized engine, and splice it in.

Considering that a motorcycle engine usually operates at a higher RPM, maybe the cat of a larger car engine would be more suitable to the higher exhaust flow

[gil]

Originally Posted by TurnNBurn

Honda 919 (CB900F). It's a 2007 model.

You could also get a newer bike. The honda CTX700 has a big cat, visible from the front of the bike. You could algo go electric, can't be cleaner than that.

[minimac]

Adding a cat to a motorcycle(that doesn't already have one) isn't going to save the earth. It may make you think you're helping, but have you seen what just one factory in China puts out in just one hour?

[cRiPpLe_rOoStEr]

Originally Posted by minimac

Adding a cat to a motorcycle(that doesn't already have one) isn't going to save the earth. It may make you think you're helping, but have you seen what just one factory in China puts out in just one hour?

Sure retrofitting a cat into an older vehicle won't "save the world", but it's not so negligible at all.

[slime]

My 1997 BMW has a cat and an O2 sensor. It's made into the exhaust system right in the middle. The only way to gut it would be to cut the top or bottom open. Remove the material, then weld the section you cut out back in. I think you will spend a lot of time trying to make a cat work efficiently on an older, small displacement motorcycle..