Stripped cylinder stud bolt.

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Apr 8, 2007
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#1
ok a budy of mine has the same bike as me, but he has stripped the thread on the cylinder bolt, its not the thread that the cylinder head bolt goes on its where the stud goes into the cylinder. Hes tried cold welding but since its cast welding it can harm and warp the cylinder, not to mension that the head need to sit flush. And advice would be great cuz he's in a big situation.
 
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#2
your friend happens to have an '84 CR125 just like you? wow. without seeing it i would suggest a heli-coil. they are easy to put in and practically bullet proof.
 
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Uchytil

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#3
Maybe helicoil? Have a machine shop look at it. Shouldn't cost all that much.
 
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#4
ya, i met him when i was looking for parts for my bike. whats a heli coil, it it something you insert into the stripped threads that create a new thread?
 
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#5
yea, on second thought, have a professional do it. if youve never done it before thats not a good one to practice on.
 
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#7
k just figured out that there was a link there. Now i know, y watching a chezzy movie. thakns
 
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#9
its like those movies you watch in shool, copied like a hundred times an have horrible sound quality
 
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#12
Welding implies a working at a temperature greater than 1100 or 1200 ( I don't remember the exact number) degrees according to AWS standards. Not exactly cold, now is it?
 
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#13
76GMC1500, first of all no one would weld a cylinder. For people who were reading this forum most likely know what i mean by cold weld, ie J.B.Weld. When you hear people talking about cold weld there talking about a strong glue that hardens almost to the strength of metal.
 
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#14
A lot of people weld cylinders, there is usually some follow-up machine work and plating to be done afterwards.

But... for this repair, a Helicoil is the way to go. They're easy to install and stronger than the original.
 
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#15
ya i showed him that cheezy video and he seemed settled, hes gunna try first with the heli-coil and if that doesnt work for some reason hes just gunna get a new cylinder from a salvage yard.