NOTE: This procedure will not work on the 990's. See "Canisterectomy" (even if you don't have a canister) for the 990 procedure. (KOTH)

Fairing and tanks already removed. Ready to start:


Disconnect SAS hose from airbox cover and remove airbox cover:

Disconnect SAS valve:

NOTE: Be sure to properly plug the small dia. vacuum hose coming from the rear intake manifold. KOTH

Unplug and remove rear EPC valve:

Don't forget to plug the hole in the airbox cover!

Remove front EPC valve:

Plug the hole in the airbox (use same method for rear):


Disconnect EPC hoses from carbs and remove. Fit caps (front carb):

Disconnect EPC hoses from carbs and remove. Fit caps (rear carb):

Remove SAS Flange (left side of rear cylinder):

The SAS valve (red arrow) can be left in place to use its gasket:

Install the block-off plate (fabricated from a piece of aluminum):

The block-off plate on the right side of the front cylinder:


Why would I disable the EPC system?

The EPC system reduces engine performance in 2nd/3rd gear and is only there to meet emissions requirements.

Why would I disable the SAS?

The SAS works together with the catalytic converter in the exhaust cans, also to reduce emissions. If you have aftermarket cans it is pointless and can cause problems. Removing the SAS is not recommended with standard cans.

Why would I remove all of this stuff rather than just disable it?

Because it is unnecessary, ugly, messy, restricts access to the engine, and because it is something else to go wrong, something else you won't have to consider if you do have problems. The repair manual actually warns that the EPC valves will malfuction if they are exposed to vibration.



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