Author Topic: Threads in cylinder head  (Read 263 times)

Online Athame57

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Threads in cylinder head
« on: September 10, 2020, 03:10:51 AM »
One of the bolts holding my cam cover to the cylinder head has a stripped thread. CB250RS woahs return to mind, getting copper inserts was a common modification of that popular dispatch riders steed. Is it also the case with the CB400F that these bolts go straight into soft ally and inserts are  a good idea?
I brake for animals!
1978 CB400F2

Offline taysidedragon

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Re: Threads in cylinder head
« Reply #1 on: September 10, 2020, 09:39:05 AM »
I've not had to do it myself, yet! I believe people have used Timeserts or Helicoil inserts successfully.
Gareth

2010 Street TripleR
1977 CB400F

Offline Arfa

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Re: Threads in cylinder head
« Reply #2 on: September 17, 2020, 12:10:53 PM »
I've helicoiled a good number of them very successfully. If it's one of the 2 bolts through the hollow dowels, you'll have to take the dowel out, otherwise the cam cover provides a good guide for squareness when drilling, and helps keep the swarf out.

 

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