Hypothetical Desmog Question

[indybobm]

The following question assumes that all of the desmog equipment on the bike is in good working order. Is it possible to disable the desmog by removing and plugging the vacuum lines from carbs 3&4 and installing vacuum caps on those carbs? If this would work then would this be an easy check to determine if the desmog equipment is working properly or malfunctioning? For example, you have a problem with yiour bike and you disable the desmog equipment and your bike then runs properly. You have eliminated a number of possible other sources for the problem.

[Ricky-D]

I think you are assuming that the desmog system is an active system as opposed to a passive system, which it is.

The only thing I see that can affect the running of the motor would be bad vacuum hoses that are leaking.

Removing bad vacuum hoses and placing caps on the ports located on the intake risers will definitely allow the motor to achieve the running potential.

Same if you replace bad hoses with good hoses.

A desmog should not affect the running of the motor. If it runs good prior to removing the smog equipment, it should run the same after the operation.

***

[indybobm]

I agree, I was thinking of a problem where the posibility of malfunctioning desmog equipment that could be eliminated by disabling it. Just part of the troubleshooting path to find reasons for a poor running engine that could be caused by a number of different causes. Would like to know for future reference in case there is a problem. I realize that it is a passive system but there are still a number of pieces to it that can cause a variety of problems. I wanted to know if it all could be eliminated by removing and plugging the two vacuum lines from carbs 3 & 4. Again, just for future reference.

[Robert]

All true unless you have a California model with the carbon canister then you will have more to do. But you should be able to disconnect the hoses and run well.

[9Ball]

I agree, I was thinking of a problem where the posibility of malfunctioning desmog equipment that could be eliminated by disabling it. Just part of the troubleshooting path to find reasons for a poor running engine that could be caused by a number of different causes. Would like to know for future reference in case there is a problem. I realize that it is a passive system but there are still a number of pieces to it that can cause a variety of problems. I wanted to know if it all could be eliminated by removing and plugging the two vacuum lines from carbs 3 & 4. Again, just for future reference.

I believe you would also need to plug the airbox connection...seem to remember a 12 mm bolt can be used to plug the hole.