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heli coil primary

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Old Jul 9, 2015 | 05:53 PM
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Default heli coil primary
have stripped screw,what size heli coil do I need,checked and found there different lenths ,the coil is 1/4 20,but lenth ??
 
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Old Jul 9, 2015 | 09:54 PM
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what is the application of the stripped screw? where on the bike?
 
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Old Jul 10, 2015 | 07:13 AM
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primary under derby cover
 
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Old Jul 10, 2015 | 07:49 AM
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Just use a little longer screw is what I did when mine striped. or use a tap and re-thread the hole
 
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Old Jul 10, 2015 | 11:01 AM
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Oversize drilling is a pain, there really isn't enough meat there and you screw up gaskets and outer primary.

You only need 12-13 ft/lb on these fasteners. So if you go 2 diameters (about 8 coils) on a stainless helicoil then you should have more than enough strength.

A 0.5" length helicoil is fine and I have used shorter at times. If you have changed to stainless fasteners then watch galling of the stainless to stainless surface. A little bit of anti seize will prevent.
 
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Old Jul 10, 2015 | 11:04 AM
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When I said oversize is a pain I meant don't go up a screw size screw just drill and helicoil for the standard 1/4.
 
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Old Jul 10, 2015 | 06:37 PM
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Default heli coil
thanks guys !!! I took it apart and resealed the primary ,(clutch basket leak)
reassembled and pinched #7 screw on rotation !!,may have been bad from earlier owner,will rip down in the morning,unfortunitly I have a heli coil kit in my FL home,i used on my 07 cement mixer(HD),gotta fix ,hate leaks !!!!,so that's .05(1/2 in) do u guys know what size tap and drill,BILL
 
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Old Jul 10, 2015 | 08:05 PM
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The drill bit is 0.260 not sure what fraction, number or letter this equates to. The tap will be a helicoil specific size.
 
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Old Jul 13, 2015 | 07:45 AM
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Drill bit is a 17/64"s (.265") and the tap only, should be available from your local NAPA store. (the entire kit is about $20.00)
Scott
 
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Old Jul 14, 2015 | 01:45 PM
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thanks scott !!!!,u da man !!!
 
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