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Thanks for your replys! In response to you, ILENGINE, here's the mower we are working on... Rockwell 139cc Petrol Lawn Mower APN #: 6947372501626 *460mm (18"). *3-in-1 catcher, side-discharge and mulcher. *Plastic catcher. *4 x swing back blades. *5 cutting positions. Model RG8072.

We have a 139cc Rockwell lawnmower, model 'WESCO R4000' series. The valves are looser than I would expect and we think tightening them will improve the engines operation, however we don't know what the valve clearance should be..would anyone know the specs or have access to a manual to tell us...