This might be a dumb idea, but I just installed a slip on exhaust and a K&N filter on my bike, 2005 ninja 636. So I would imagine without a power commander or tune it's going to run lean. I intend on getting a power commander soon, but I need to save up for a few weeks. Yes I pulled the trigger on an exhaust too soon, but it's done now. Do you think using lucas upper cylinder lube would mitigate the harmful effects of an engine running too lean for a few weeks?