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  #1  
Old 11-16-2009, 08:12 PM
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Pics 02 YZ250F TIMING PROBLEM!! HELP

     

my yz250f starts but ticks real bad its a 02 but has an upgradged auto decompression cam with new crank in it but it seems to me its ticking so loud because of the auto decompression cam...i just adjusted the valves to the specifications .10-.15 exhaust .17-.22 intake but i think these timing marks just look off kinda like the chain is stretched i was looking for a second opinion thanks in advance
cam timing marks picture by charlray192 - Photobucket
Crankcase Timing I mark picture by charlray192 - Photobucket
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Old 11-17-2009, 01:12 AM
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The pictures aren't there it says?
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Old 11-17-2009, 08:25 AM
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I was able to find his pics if you click on bikes (on the left)


Its hard to tell by the photo, but is the timing lined up with the "I"

Timing looks correct, but you did not have one with the lobes. Are the lobes point out like this
http://img.photobucket.com/albums/v1...imingRight.jpg


If you think it is the cam chain, then replace it.
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Old 11-17-2009, 01:51 PM
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I would have to agree, if you think it is, and if the bike has a lot of hours, replacing it is not a bad idea.
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Old 11-17-2009, 10:03 PM
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sorry here are the pics to the right location dirtbikes :: cam timing marks picture by charlray192 - Photobucket
dirtbikes :: Crankcase Timing I mark picture by charlray192 - Photobucket

ok that those but what could the loud ticking be if i have everything in spec? should the timing be different since is a auto decompression cam? i thought the rule for this year was 12 pins punch mark to punch mark...i think that for all the yz250fs?? am i wrong?
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Old 12-06-2009, 06:12 PM
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ok i found it out i put new head gasket on it and new gasket for the exhuast no more timing punch marks off and no more ticking its crazy what a new head gasket can cure lol thanks guys
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Old 12-07-2009, 12:07 PM
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Awesome! Good job.
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Old 12-07-2009, 12:17 PM
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Talk about a clearance issue.
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