Honda TRANSALP XL600-650V (1987-2002) [81/291] 32 engine clutch and transmission
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Honda TRANSALP XL600-650V (1987-2002) [81/291] 32 engine clutch and transmission

Honda TRANSALP XL600-650V (1987-2002) [81/291] 32 engine clutch and transmission

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2 32 Engine clutch and transmission though rubbing your hands together rather than a circular motion i e so that the valve rotates alternately clockwise and anti clockwise rather than in one direction only see illustration If a motorised tool is being used take note of the correct drive speed for it If your drill runs too fast and is not variable use a hand tool instead Lift the valve off the seat and turn it at regular intervals to distribute the grinding compound properly Continue the grinding procedure until the valve face and seat contact area is of uniform and correct width and unbroken around the entire circumference see illustration and 14 13 23 Carefully remove the valve from the guide and wipe off all traces of grinding compound making sure none gets in the guide Use solvent to clean the valve and wipe the seat area thoroughly with a solvent soaked cloth 24 Repeat the procedure with fine valve grinding compound then repeat the entire procedure for the remaining valves 25 Working on one valve at a time lay the spring seat in place in the cylinder head making sure the shouldered side faces up see illustration 26 Fit a new valve stem seal onto the guide using a stem seal fitting tool or an appropriate size deep socket to push the seal over the end of the valve guide until it is felt to clip into place see illustrations Don t twist or cock the seal or it will not seal properly against the valve stem Also don t remove it again or it will be damaged 27 Coat the valve stem with molybdenum disulphide oil a 50 50 mixture of molybdenum 14 17a Measure the free length of the valve springs 14 17b Check the valve springs for squareness Specifications see illustration If any spring is shorter than specified it has sagged and must be replaced with a new one Also place the spring upright on a flat surface and check it for bend by placing a ruler against it or alternatively lay it against a set square see illustration If the bend in any spring is excessive it must be replaced with a new one 18 Check the spring seats retainers and collets for obvious wear and cracks Any questionable parts should not be reused as extensive damage will occur In the event of failure during engine operation 19 If the inspection indicates that no overhaul work is required the valve components can be reinstalled in the head 20 Unless a valve service has been performed before installing the valves in the head they should be ground in lapped to ensure a positive seal between the valves and seats This procedure requires coarse and fine valve grinding compound and a valve grinding tool either hand held or drill driven If a grinding tool is not available a piece of rubber or plastic hose can be slipped over the valve stem after the valve has been installed in the guide and used to turn the valve 21 Apply a small amount of coarse grinding compound to the valve face and some molybdenum disulphide oil a 50 50 mixture of molybdenum disulphide grease and engine oil to the valve stem then slip the valve into the guide see illustrations Note Make sure each valve is installed in its correct guide and be careful not to get any grinding compound on the valve stem 22 Attach the grinding tool or hose to the valve and rotate the tool between the palms of your hands Use a back and forth motion as 14 21a Apply the lapping compound very sparingly in small dabs to the valve face only 14 21b Lubricate the stem and insert the valve in the guide 14 22a Rotate the valve grinding tool back and forth between the palms of your hands 14 22b The valve face and seat should show a uniform unbroken ring and the seat should be the specified width all the way round 14 25 Fit the spring seat making sure it is the correct way up 14 26a Fit a new valve stem seal Reassembly

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