The PHBH 28mm version can be used as a replacement carburettor on various 125cc vehicles (e.g. RS 125). On 125s with a smaller carburettor, it can even have a slight performance-enhancing effect if tuned correctly.
Does NOT have an oil connection! When using the carburetor, you have to fill up 2-stroke with mixture! With 4-stroke engines there is nothing to consider.