new rings and valve grinding ?? help guys !!


7 replies to this topic
  • mikey 4410

Posted May 27, 2007 - 10:39 AM

#1

my xr600 is very easy to kick over when trying to find tdc and i keep MISSING it. its done 30,000 kms. please any advice would be great

thanks in advance

  • kellismechanic

Posted May 27, 2007 - 11:52 AM

#2

Check the compression, wet and dry, if it is under 100psi, you need rings, if the wet reading is higher, if it is the same, you need the head worked on, as in valves.:) :ride:

  • Billahjack

Posted May 29, 2007 - 06:56 PM

#3

What is wet versus dry compression? I always just screwed the tube into the sparplug hole and kicked it over.

  • creeky

Posted May 29, 2007 - 07:04 PM

#4

What is wet versus dry compression? I always just screwed the tube into the sparplug hole and kicked it over.


Do the compression check in the normal manner, then pull the spark plug and squirt a generous amount of motor oil into the spark plug hole and repeat the compression check. If the compression improves significantly after squirting in the oil, the rings are worn. If the compression does not improve, the valves are the culprits.

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  • Billahjack

Posted May 30, 2007 - 05:54 PM

#5

Do the compression check in the normal manner, then pull the spark plug and squirt a generous amount of motor oil into the spark plug hole and repeat the compression check. If the compression improves significantly after squirting in the oil, the rings are worn. If the compression does not improve, the valves are the culprits.


Cool! Thanks for the tip. :thumbsup:

  • NavyNuke

Posted May 31, 2007 - 03:59 PM

#6

thanks for the tip. never heard that.

  • butcharin

Posted June 01, 2007 - 05:37 AM

#7

Does the auto decompresion affect the compretion check?

  • XR650L_Dave

Posted June 01, 2007 - 07:55 AM

#8

XR650L auto-decomp does drastically lower the reading.

You are supposed to see, 90 psi I think with it active, and much higher when you disable it by loosening one of the exhaust tappets a bit.

Dave





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