66cc, M7 or M8?

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DanielMaia

DanielMaia

New Member
Jun 24, 2009
309
0
0
Portugal
Hey there guys!

Another engine i have here, and, one day..i just tighten too much a stud, resulting on a stripped off stud (we only learn by the bad way)

Im going to put a Helicoil..but have a doubt, it is M7 or M8? the stud it self it has 7.60mm, on the side of 1.0 thread. But the hole in the crankcase, has 6.6 or 6.7mm

What size of helicoil should i buy?
 
rohmell

rohmell

Active Member
Jun 2, 2010
1,531
6
38
New York
A Helicoil would restore the thread to its original size, therefore you have to drill and tap a hole oversize for the coil to go into it. I don't think that there is enough metal for an oversize hole. These engines use either a M6 or M8 stud, so recheck your measurements.
I think it is M6 and when the stud came out it ripped the threads so now you are measuring 6.6/6.7
 
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