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What are the head bolt torque specs for 1979 Yamaha

Posted by Anonymous on

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  • Yamaha Master
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Hi, Anonymous I would love to help you but due to the magnitude of yesterday's solar flare the batteries in my crystal ball are dead and my mental telepathy headset circuitry was melted. I need the year, make, and model of your motorcycle please click on the word "COMMENT" below and provide this information in the box that will open and then click on the green comment box in the bottom right-hand corner after it posts I will receive an "ALERT" icon that will allow me to respond to your information. Good luck and have a nice day.

Posted on Feb 05, 2017

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6ya6ya
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Posted on Jan 02, 2017

bunnydawg
  • 5158 Answers

SOURCE: 91 kx 250 torque values

Engine Top End:
Auto Decompressor Bolt 104 in·lb
Cylinder Head Cover Bolts 87 in·lb
Cylinder Head Bolts: M10 36 S
M6 104 in·lb S

the S in that means the specified pattern ... just like tightening car tire bolts... please note all that it its INCH lbs....

don't know why it says just 36 for the M10 bolts unless they left out inch lbs

Anything else let me know as i've got a manual for the 250 f... actually i've got a few different ones

Robert

Please take a moment to rate this solution as i've taken a few minutes to find the manual thanks

Posted on Jan 28, 2009

chuck943
  • 783 Answers

SOURCE: Head bolt torque specs needed for 96 tbird 3.8

Head bolts are torque to yeild so you MUST use new bolts.
Tighten cylinder head retaining bolts in numerical sequence in three steps as follows:

  1. 20 Nm (15 lb-ft).
  1. 40 Nm (30 lb-ft).
  1. 50 Nm (37 lb-ft)
Loosen retaining bolts one at a time two to three revolutions and retighten as follows:

Long bolts:
  • Tighten to 40-50 Nm (30-37 lb-ft).
  • Rotate an additional 175-185 degrees.
  • Go to next bolt in sequence.
Short Bolts:
  • Tighten to 20-30 Nm (15-22 lb-ft).
  • Rotate an additional 175-185 degrees.
  • Go to next bolt in sequence.
Here is a pic of the sequence
http://i253.photobucket.com/albums/hh43/chuck943/Headboltsequence38L.gif

Posted on Mar 19, 2009

  • 3567 Answers

SOURCE: need torque specs for 98 yz 250,rebuilding engine

Go to the site below and you can download a free srevice manual for your bike.

http://www.carlsalter.com/motorcycle-manuals.asp

Top rating due on this answer!

Posted on Apr 13, 2009

polarcycle
  • 1392 Answers

SOURCE: head bolt torque spec

Always use new head bolts.
1)tighten to 40ft/lbs
2)back off 1/2 turn
3)tighten back to 40ft/lbs
4)tighten an additional 90 degrees
5)tighten an additional 90 degrees.

Posted on Aug 16, 2009

outdoorsman5
  • 631 Answers

SOURCE: head bolt torque specs for 2000 dodge neon 2.0 SOHC

I have the specs and diagrams. If you want me to send them to you, give me your email address. Outdoorsman592003@yahoo.com

Posted on Sep 05, 2009

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