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Honda CB750/900/1100F SuperSport Website: SuperSport Forums


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spammy
Twinstar
Twinstar



Joined: Jan 29, 2012
Posts: 227
Location: Adelaide

PostPosted: Thu Oct 22, 2020 4:47 pm Reply with quote Back to top

So whilst removing the camshaft holders one of the bolts broke with the thread deep in the hole. I thought bolts might break over torquing them but not loosening them. So I had some HSS drill bits lying around and I wanted to try and drill through the center and hammer in lightly with an 'easy out' screw extractor but the drill bit didn't make a dent. So off to the hardware shop to buy a 3/32 cobalt drill bit and it worked great, metal filings straight away. The easy out went in and the broken bolt thread came out. It all worked out but I hate broken bolt heads😊
 
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swiftnick
Black CB900F
Black CB900F



Joined: Sep 01, 2006
Posts: 1688
Location: Farmington Hills, MI

PostPosted: Thu Oct 22, 2020 6:57 pm Reply with quote Back to top

Those bolts snap when you try to undo them if they were overtightened previously. Always use a torque wrench and or better bolts.

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1982 CB900FC (UK Version) 1 owner
1983 CB1100RD (Fastest, red and blue)
1975 CB400 four
2012 ST1300
1982 CX500 Turbo
1991 FJ1200
1976 CB750 Super Sport
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1337
Black CB750F
Black CB750F



Joined: May 11, 2014
Posts: 1011
Location: San Diego

PostPosted: Thu Oct 22, 2020 7:25 pm Reply with quote Back to top

Get the higher strength bolts from Genesound on this forum.

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1983 Honda CB1100F
1980 Suzuki GS1000E
2009 Yamaha FZ1
2006 H-D Fatboy 
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techie66
Hawk
Hawk



Joined: May 28, 2009
Posts: 465
Location: Jacksonville, NC

PostPosted: Fri Oct 23, 2020 1:41 am Reply with quote Back to top

+1 on hating broken bolts! Always feels good when it comes out.

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Jacob
1983 CB1100F Blue
2010 HD XL1200X 48
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genesound
Red CB1100F
Red CB1100F



Joined: Feb 20, 2006
Posts: 11926
Location: Studio City, California

PostPosted: Fri Oct 23, 2020 7:57 pm Reply with quote Back to top

It might help if you hit the bolts on the head with a small hammer (maybe use drift) before trying to break them loose.

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Viton Valve Stem Seals
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spammy
Twinstar
Twinstar



Joined: Jan 29, 2012
Posts: 227
Location: Adelaide

PostPosted: Sat Oct 24, 2020 5:39 am Reply with quote Back to top

Good idea.
 
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