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Author Topic: How screwed am I?  (Read 1058 times)

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Offline 76400F

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How screwed am I?
« on: March 02, 2016, 11:46:23 AM »
Just when everything was going so well...my 76 400F is now officially once again a rolling chassis and I'm on to painting and rebuilding the engine.

Long story short, in the process of removing the 6mm bolt that holds on the special spark advancer washer (nut), I snapped the little bugger off. How screwed am I? What does it screw into and how do I get the broken part of the bolt out? I know someone is going to say 'the end of the crankshaft, and you can't'...

And while I'm at it, how does the spark advancer come off? It seems on there pretty good.

Thanks,
Knucklehead
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What I rode back in the day:
1970 Honda CD175 x2
1976 Honda CR125 Elsinore
1980 Yamaha YZ125
1976 Honda CB400F (bought in 83, restored 2016)
1983 Yamaha RZ350 x2
1986 Yamaha FZ600

Offline 76400F

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Re: How screwed am I?
« Reply #1 on: March 02, 2016, 12:23:04 PM »
...so it looks like there's just a pin holding the advancer on? Once I get it off I should be able to have decent access to the broken off bolt to get it out with an easy out or something...maybe not as bad as I thought...
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What I rode back in the day:
1970 Honda CD175 x2
1976 Honda CR125 Elsinore
1980 Yamaha YZ125
1976 Honda CB400F (bought in 83, restored 2016)
1983 Yamaha RZ350 x2
1986 Yamaha FZ600

Offline 76400F

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Re: How screwed am I?
« Reply #2 on: March 02, 2016, 12:31:38 PM »
nevermind, under control...advancer comes off with a tap of a screw driver handle. Duh. Saw a picture of the way it comes off  in an obscure shop manual...

just need to get the broken bolt out and it's back to normal...
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What I rode back in the day:
1970 Honda CD175 x2
1976 Honda CR125 Elsinore
1980 Yamaha YZ125
1976 Honda CB400F (bought in 83, restored 2016)
1983 Yamaha RZ350 x2
1986 Yamaha FZ600

Offline camelman

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Re: How screwed am I?
« Reply #3 on: March 02, 2016, 09:57:58 PM »
Glad I could help. ;)
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1972 350f rider: sold
1972 350f/466f cafe: for sale
1977 CB400f cafe:sold
1975 CB400f rider: sold
1970 CB750 K0 complete bike: sold
2005 Triumph Sprint ST 1050 rider

We've got to cut it off... and then come down on rockets.  (quoted from: seven minutes of terror)

Offline 70CB750

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Re: How screwed am I?
« Reply #4 on: March 03, 2016, 04:16:33 AM »
Quote from: 76400F on March 02, 2016, 12:31:38 PM
nevermind, under control...advancer comes off with a tap of a screw driver handle. Duh. Saw a picture of the way it comes off  in an obscure shop manual...

just need to get the broken bolt out and it's back to normal...

How much of it is left sticking out?
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Prokop
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Pure Gas - find ethanol free gas station near you

I love it when parts come together.

Dorothy - my CB750
CB750K3F - The Red
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2006 KLR650

Offline rb550four

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Re: How screwed am I?
« Reply #5 on: March 03, 2016, 04:07:44 PM »
  I did that break once. A left handed drill bit heated it up enough to back out on the bit. I didn't have to use an ez out, which was great cause I usually brake those...when that happens you're screwed.
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A few Honda 500's, a few Honda 550's, a few Honda 650's, '72 cb 450, a couple 500/550/650 hybrids, and 2001 750. 
  550 Snowbike -Somebody had to do it.
  http://forums.sohc4.net/index.php/topic,101678.0.html             
http://forums.sohc4.net/index.php/topic,137317.msg1550907.html#msg1550907

Offline alacrity

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Re: How screwed am I?
« Reply #6 on: March 03, 2016, 04:28:15 PM »
In all the world there isn't a more cynically and incorrectly named tool than the "Ez-Out." 
How many times have these things frustrated me? How many times has the job been not "EZ" and busted/stuck bolt didn't come "out?"  I lost count a very long time ago...

Left hand drill bits are what work.

If you are gonna work on old bikes and have a tendency toward hamfistedness, get a full set of these with lots of small incremental steps.  You'll use em.  Funny thing is, the more you work on old bikes, the less you find you need them.

;-)
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I recently restored and sold a 77 cb750f, and am nearly finished with a (former basket case) cb750k5.  This is a place to share, learn and enjoy.  I am grateful to and for 99+% of this site's membership.
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