What engine is fitted? If it's a side valve of any sort, you can't (more accurately, you will never need to unless the valves have been replaced - in which case adjusting is accomplished by grinding the valve stem). If the engine is OHV, the rockers either have an adjustable pivot, or pin and locknut (like a car).
phil_saunders(a)bigfoot.com
Phil Saunders, July 2009
