Got a bike with a black engine that just isn't so black anymore? Bikers like you told S100 they needed special help in this area and they listened! Their S100 Engine Brightener can take a tired, grayed-out engine and make it look almost factory-new again! Just clean the engine and dry, then spray on our temperature stable S100 Engine Brightener. Use the handy misting spray nozzle (an industry exclusive) to get into the cooling fins and crannies without over-applying. That factory black look comes back and lasts for miles and miles and holds up to a bunch of washes, too. Friends will think you replaced the engine! Restores black color and luster to faded engine parts. Will not rinse off. Will not harm plastics, paint or engine case / cylinder finish.