I know things... A lot of things.
Join Date: Feb 2015
Motorcycle: GSXR 750 K4
Re: Simple Question
As described above, the cylinders would draw part of the air via the leak, resulting basically in a leaner charge, as some of it would be unmetered and unfueled. The proportion and hence the final AFR would depend on the throttle opening, as a closed throttle would result in more restriction in drawing air through the throttle body an hence more fresh air through the leak. In short you'd be having lean conditions getting worse as the throttle closes and being perhaps fine at WOT.