Question about Yamaha YZ 250 Motorcycles

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1993 YZ250 Timing

How do I adjust the timing on my YZ250?

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Judging by your previous questions,I think this is the info you need.
Setting cam timing with stock cams is relatively easy using the punch mark on the cam gears For stock timing, the punch marks at 9 O'clock on the exhaust cam and at 3 O'clock on the intake cam should align with the top of the head. If stock timing is altered the exhaust cam punch mark will either be one tooth above or one tooth below the top of the head.
1993 YZ250 Timing - e4c9919.jpg

  1. Take out tensioner.
  2. Remove both plugs from shifter side of crankcase, the center plug to turn, the 11:00 plug to locate the 'I' (not the H) in.
  3. Use a ratchet on end of crankshaft (through center plug) and zip tie ratchet to footpeg with the I lined up in the timing plug hole.
  4. With the intake cam (rear one) pointing straight back, align the punch mark on the backside of the intake cam sprocket with the top of the head. Since the slack in the timing chain is in the back, if it doesn't align exactly right at the top of the head, err slightly high. Zip tie chain to intake sprocket.
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  1. Remove exhaust cam, count 12 links (where sprocket teeth will go) from the punch mark on the top of the intake cam and mark that position on the chain with something noticeable (use a Sharpie). Hold the exhaust cam close the to intake cam with the exhaust cams pointing horizontally to the front of the bike. With the exhaust cam in this position, there will be a punch mark at the top. Put the tooth above this punch mark in the chain link you marked that was 12 or 13 over. Zip-tie the chain to the exhaust cam.
  2. Reseat exhaust cam. The punch mark on the left side of the exhaust sprocket will align with the top of the head. It will be one link high. Go back and check that the I is still centered in the timing plug hole
    1. the intake cams point back
    2. the exhaust cams point frontward
    3. the rear punch mark on the intake is aligned or slight high with the top of the head
    4. the front punch mark of the exhaust sprocket is aligned with the top of the head
  3. Bolt and torque exhaust cam, torque intake if you've had it off.
  4. Install chain tensioner (wind it up, hold the screwdriver with two hands, use the third hand to put hold tensioner in place, and fourth hand to bolt it up, then release screwdriver and put end bolt in it.
  5. Remove zip ties on intake sprocket, exhaust sprocket, and ratchet holding TDC. Remove ratchet and replace both plugs.
  6. Put on valve cover and two hoses, reinstall tank and seat and go riding.

Please rate this a Fixya.

Posted on Feb 01, 2009

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Buy a manual, and read it and follow the instructions. Never fails if done correctly. The above post is worthless since there was no YZ250F made until 2001.

Posted on Jul 16, 2012

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