![]() ![]() If you’ve got this far, I can gladly say you’re done! Oops, you need to put it all back together again! Now, with the rocker cover, give the oil seal a nice smearing of engine oil and push it into the underside of the cover before you put it back on the cylinder head. Torque wrench capable of between 10-20Nm at least.Tappet adjusting tool (you can get away with long nose pliers or possibly your fingers!). ![]() Metric feeler gauges (make sure they are clean and lightly oiled – WD40 is fine).Screwdrivers – Phillips sizes 2 and 3 (as well as a short no.However, during the interim between the 600 mile service and first 2’500 mile service, things are still bedding in, so it is advisable to check them at some point in between. Honda specify that you adjust the valve clearance on the CBF125 at the 600 mile first service, then every 2’500 mile service afterwards. Okay, let’s get on with the job! Click on the images to get nice big juicy high-resolution versions. Please also refer to the owner’s manual as a primary source of information regarding this procedure! If you are not confident in following any part of this procedure, I strongly suggest you get a competent person or qualified mechanic to do the work. There may well be sections of it that are incorrect! I will not accept any responsibility or liability whatsoever if you damage/destroy something or injure/kill someone by following what I’ve written! YOU are entirely responsible for your own choices and actions, including the choice of following what I have written and the actions of carrying out the work. ![]() The valves may also not open fully, which will cause poorer engine performance/idling.īefore we start, this information is simply an account of my experiences. If the valve clearance is too great, with a large gap between the tappet and valve stem, then the valve stem and tappet will wear more quickly as they’d be colliding against each-other with more force. If there is no valve clearance (gap too small), you could bend the valve or it will be forced open a little, causing poor idling, excessive fuel consumption and/or poor running (depending on which valve is the culprit). That gap is there for a very good reason – as the engine heats up, these components will expand and the gap will be filled. The tappet is a small part that is part of an assembly called a rocker arm and it is the part that pushes on the stem of the poppet valve to open it. The term ‘valve clearance’ refers to the gap between the tappet and top of a valve stem. The CBF125 uses the traditional ‘tappet and lock nut’ method for setting valve clearances, which is very common, if not universal, on simple, small displacement engines. On an engine, valves are situated in the cylinder head (‘top end’) and their job is to let fuel-air mixture in to the cylinder for combustion and to let burnt exhaust gasses out. ![]()
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