stock head bolt information?

SuperEyeGuy

New Member
Dec 27, 2017
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Hello i am new here,

I just built my first kit bike and was wondering what are the lengths of the bolts that go into the cylinder head?

I know they are 6mm studs being this is a 50cc and upon assembly i noticed that the head bolts feel squishy upon torquing the head so it would go to 12 ft pounds then back off to 10 ft lbs.....

I have got them to sit at exactly 12 to 12.5 ft lbs but i feel like they are going to snap off.

These bolts cant be as high quality as my friend claims and i would like to go to a local department store and pickup some new bolts due to them constantly loosening i keep loosing top speed cause they want to keep backing out it goes about 25mph.
 

crassius

Well-Known Member
Sep 30, 2012
4,032
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or more flat washers under the acorn nuts - but be sure to remember that 6mm studs only go to 6 to 8 ft/lb
 

Larry Trotter

Active Member
Nov 26, 2017
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I was under the impression that the 8mm studs were 12 foot pounds and the 6mm studs were around 6 -8 foot pounds? Larry

haha sould have read the post above mine. You may be slowly pulling the studs out of the aluminum case. Larry