Valve Clearance? Help

3 replies to this topic
  • superior

Posted January 16, 2008 - 08:00 PM


Hello I have a 1983 XL600R and I have the service manual. I have removed teh crankshaft and timing mark hole caps and I have the piston at Top Dead Center. I know that the valves clearances need to be (intake .05mm and .10mm for exhaust.

[COLOR="Red"]When the piston is at Top Dead Center, which valves are the intake valves and which valves are the exhaust valves?[/COLOR]


  • Thumpmeister

Posted January 16, 2008 - 08:13 PM


The intake valves are the the rear set that are closer to the back of the bike. The exhaust ones are the ones on the front of the head; right where the headers come out.

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  • HawkGT

Posted January 16, 2008 - 08:56 PM


Remember there are two TDC's--a compression stroke TDC and an exhaust stroke TDC. To check/adjust the valves all four of them need to be full closed which means you need to be on the compression stroke TDC. Unless the valves are at 0 clearance, you'll know which TDC you're on because each tappet will have a smidgen of play on the compression TDC. Or, you can just watch the valves as you turn it over and notice the valves open/close. Make sure they're all closed as you reach TDC and you'll know that's the compression TDC.

  • martinfan30

Posted January 17, 2008 - 08:24 AM


The cam lobes should all be pointing downwards at a slight angle. This is compression TDC.

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