Question about 1987 Yamaha SDR

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93 artic cat jag head torque pattern and specs

Leaking oil around the head gasket wondering what the torque should be for the new gasket

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  • nuttbysteve Feb 13, 2009

    Thank-you!!!

  • Anonymous Mar 15, 2014

    Torque for head gasket in a 2008 R1

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The best place to find it is the service manual. if not avail. i usually 1, tighten it to ~10-20Nm in a 'outwards spiral' fashion, ie start tightening from centre bolts outwards. 2, spiral tighten by 1/4 turn, 3, another 1/4 turn, and 4, final 1/4 turn.

Posted on Feb 13, 2009

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What are the torque specifications for the heads on sporster


You didn't say what year model. Sometimes the heading at the top of these postings are not correct.

For an Evo Sportster, the head bolts must be torqued in a particular sequence. The head bolts are labeled #1, 2, 3, & 4 in the drawings, not literally. The front head bolts are numbered differently from the rear as well.

You torque the bolts in three steps. The first step, you torque the bolts to 7-9 foot pounds. Then you torque them to 12-14 foot pounds. And finally, you mark each bolt and pull it down an additional 1/4 turn. You must torque the bolts in the following sequence.

On the front head, the #1 bolt is the front bolt on the left side of the cylinder head, then the #2 bolt is the left rear bolt, #3 bolt is the right front, and #4 bolt is the right rear as viewed from the top of the head.

On the rear head, the #1 bolt is the bolt at the left rear, #2 bolt is the bolt at left front, #3 bolt is the bolt at right rear, and #4 bolt is the bolt at right front as viewed from the top.

Do not forget to put the O-rings on the dowels when you put the head gasket on and oil the threads of the studs. Make sure you put a new cylinder base gasket on the bottom of each cylinder as well. Once the torque has been taken off the cylinders, the base gaskets will leak unless they are replaced.

On an Ironhead, the head torque is 60-70 foot pounds tightened in a criss-crossed pattern.

Jan 28, 2010 | 2000 Harley Davidson XL 1200 C Sportster...

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