Valve adjustments on a 04 DS650X
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01-04-2007, 02:02 PM
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#2
01-04-2007, 04:34 PM
Valve adjustments on a 04 DS650X
they only need adjusted if they measure out of spec during inspection.
inspection should be done after first 10 hours break-in period, and then every 100 hours or once a year - whichever comes first.
this is of course assuming normal riding on a stock motor, highly modded motors and motors used for race do it more often
most motors need an adjustment sometime during the first 200 hours. and once adjusted go for a very long time before needing it again. dual overhead cam motors using tappet/shim configuration like the DS keep their adjustment longer than the typical rocker arm adjusted motors.
the inspection is easy, nothing special needed other than feeler gauges, the head cover gasket is infinitely reusable, nothing to replace when just checking them
if people wait til they experience problems before adjusting valves, then this will cause a loss of power that will not be gotten back just by bringing the valve adjusment back into spec. the valves lose gap over time as the valve face and seat wears. eventually the gap is gone, and ultimately leads to a valve not closing all the way during fire. this causes deposits to build on the valve face and seat that will still be there after adjusting and will not go away. these deposits hinder airflow and sealing, thus power loss. the only way to rectify this and bring her back to like new is to disassemble the head and clean it all out.
inspection should be done after first 10 hours break-in period, and then every 100 hours or once a year - whichever comes first.
this is of course assuming normal riding on a stock motor, highly modded motors and motors used for race do it more often
most motors need an adjustment sometime during the first 200 hours. and once adjusted go for a very long time before needing it again. dual overhead cam motors using tappet/shim configuration like the DS keep their adjustment longer than the typical rocker arm adjusted motors.
the inspection is easy, nothing special needed other than feeler gauges, the head cover gasket is infinitely reusable, nothing to replace when just checking them
if people wait til they experience problems before adjusting valves, then this will cause a loss of power that will not be gotten back just by bringing the valve adjusment back into spec. the valves lose gap over time as the valve face and seat wears. eventually the gap is gone, and ultimately leads to a valve not closing all the way during fire. this causes deposits to build on the valve face and seat that will still be there after adjusting and will not go away. these deposits hinder airflow and sealing, thus power loss. the only way to rectify this and bring her back to like new is to disassemble the head and clean it all out.
#3
01-05-2007, 01:04 PM
#4
01-05-2007, 03:03 PM
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"A little nonsense now and then, is relished by the wisest men". Willy Wonka: 1971
Cigars! Earth ne'eer did breed such a jovial weed.
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Valve adjustments on a 04 DS650X
Originally posted by: Hightower
they only need adjusted if they measure out of spec during inspection.
inspection should be done after first 10 hours break-in period, and then every 100 hours or once a year - whichever comes first.
this is of course assuming normal riding on a stock motor, highly modded motors and motors used for race do it more often
most motors need an adjustment sometime during the first 200 hours. and once adjusted go for a very long time before needing it again. dual overhead cam motors using tappet/shim configuration like the DS keep their adjustment longer than the typical rocker arm adjusted motors.
the inspection is easy, nothing special needed other than feeler gauges, the head cover gasket is infinitely reusable, nothing to replace when just checking them
if people wait til they experience problems before adjusting valves, then this will cause a loss of power that will not be gotten back just by bringing the valve adjusment back into spec. the valves lose gap over time as the valve face and seat wears. eventually the gap is gone, and ultimately leads to a valve not closing all the way during fire. this causes deposits to build on the valve face and seat that will still be there after adjusting and will not go away. these deposits hinder airflow and sealing, thus power loss. the only way to rectify this and bring her back to like new is to disassemble the head and clean it all out.
they only need adjusted if they measure out of spec during inspection.
inspection should be done after first 10 hours break-in period, and then every 100 hours or once a year - whichever comes first.
this is of course assuming normal riding on a stock motor, highly modded motors and motors used for race do it more often
most motors need an adjustment sometime during the first 200 hours. and once adjusted go for a very long time before needing it again. dual overhead cam motors using tappet/shim configuration like the DS keep their adjustment longer than the typical rocker arm adjusted motors.
the inspection is easy, nothing special needed other than feeler gauges, the head cover gasket is infinitely reusable, nothing to replace when just checking them
if people wait til they experience problems before adjusting valves, then this will cause a loss of power that will not be gotten back just by bringing the valve adjusment back into spec. the valves lose gap over time as the valve face and seat wears. eventually the gap is gone, and ultimately leads to a valve not closing all the way during fire. this causes deposits to build on the valve face and seat that will still be there after adjusting and will not go away. these deposits hinder airflow and sealing, thus power loss. the only way to rectify this and bring her back to like new is to disassemble the head and clean it all out.
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