Do you mean the engine number? If so you will find it on the engine cowl where the HT lead leaves the cowl assy(just above the small hump). You will need this number for ordering engine parts...It also holds the date of manufacture:) The section of numbers you need are possibly being covered by that small flat bar bracket on the cowl(hard to see in the images) but the numbers are close to this spot..Maybe check underneath:)
