Replacement pressure feed nipple for the UMS 7-77cc, the seven-cylinder 77cc four-stroke radial from UMS.
Function: it is the pressure feed nipple, which provides the crankcase pressure signal that pressurises the fuel tank.
The reason this ends up on an order: the crankcase pulse is what feeds fuel on a two-stroke-style pressure system, so a blocked or loose nipple leans the mixture at high power. Supplied as a pack of 4, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Check the nipple is clear and that the tube fits without leaking.
Reviews
There are no reviews yet.