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Offline ETIDiot750four

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Nightmare750
« on: July 06, 2016, 10:12:56 AM »
Among the MANY issues ive encountered with my 74k4, ive run into the issue of a hole being bored through my points cover from the inside. There doesnt seem to be any damage to the internals and nothing seems to telescope out easily. It has really been one thing after another and this is definitely stumping me. If anyone has seen or heard of this issue please give me a shout back.
Thanks!
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Offline BomberMann650

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Re: Nightmare750
« Reply #1 on: July 06, 2016, 10:18:22 AM »
I thought that hex head screw settled into a recess on the crankshaft nut?
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Offline riffman12

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Re: Nightmare750
« Reply #2 on: July 06, 2016, 10:28:04 AM »
woah your CB750 is now a lathe
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Offline BomberMann650

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Re: Nightmare750
« Reply #3 on: July 06, 2016, 10:35:04 AM »
Quote from: riffman12 on July 06, 2016, 10:28:04 AM
woah your CB750 is now a lathe

Horizontal Boring Machine
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Offline ETIDiot750four

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Re: Nightmare750
« Reply #4 on: July 06, 2016, 03:04:13 PM »
-_- .. You guys are as bad as my friends in real life  ;D
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Offline BomberMann650

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Re: Nightmare750
« Reply #5 on: July 06, 2016, 03:14:46 PM »
Quote from: ETIDiot750four on July 06, 2016, 03:04:13 PM
-_- .. You guys are as bad as my friends in real life  ;D

Just a little a.d.Hey a squirrel!

All joking aside.  I dont know if the little bolt is supposed to stick out that far from the big crank nut.  On my 550 it sits close to flush.  No rub on points cover.
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Offline scottly

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Re: Nightmare750
« Reply #6 on: July 06, 2016, 04:57:07 PM »
That's not a stock 750 point cover. I also notice the bottom rear post that holds the ignition plate is broken off. Place a straight-edge against the big "nut" and measure the distance to the engine case where the cover sits: It should be close to 1 inch. The small nut sticks out about .080-.100" above that.
 
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Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline ETIDiot750four

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Re: Nightmare750
« Reply #7 on: July 12, 2016, 11:35:16 AM »
Thanks for all the pics and info scottly. Hopefully i'll sort that out this week.
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Offline PeWe

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Re: Nightmare750
« Reply #8 on: July 12, 2016, 12:04:29 PM »
The small 10mm nut sit flush with the big 23mm nut on my CB750. Is the stud tightened?
« Last Edit: July 12, 2016, 10:20:15 PM by PeWe »
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline ekpent

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Re: Nightmare750
« Reply #9 on: July 12, 2016, 09:00:25 PM »
 The 'nut' in the posters picture looks more like a bolt head. See the screws holding the mounting plates are bolts also. Some previous owner mods going on there.
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Offline bluezboy

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Re: Nightmare750
« Reply #10 on: July 14, 2016, 04:55:54 AM »
I see another problem headed your way with that Dyna! Points are your best friend, believe me, I know that for an expensive fact :)!
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Offline Retro Rocket

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Re: Nightmare750
« Reply #11 on: July 14, 2016, 05:49:22 PM »
Quote from: bluezboy on July 14, 2016, 04:55:54 AM
I see another problem headed your way with that Dyna! Points are your best friend, believe me, I know that for an expensive fact :)!

I've seen you post on this subject before BB, Dyna had a run of #$%*ty ignitions a few years back, there may well be a few still doing the rounds, they aren't all bad though, thousands using them  without problems... ;)
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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline scottly

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Re: Nightmare750
« Reply #12 on: July 14, 2016, 07:46:56 PM »
The biggest issue the OP has is the missing post that mounts the ignition plate, IMHO.
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Don't fix it if it ain't broke!
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Offline Retro Rocket

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Re: Nightmare750
« Reply #13 on: July 14, 2016, 07:48:54 PM »
Quote from: scottly on July 14, 2016, 07:46:56 PM
The biggest issue the OP has is the missing post that mounts the ignition plate, IMHO.

+1
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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.
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