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Author Topic: Spark advancer shaft remove from crankshaft  (Read 3463 times)

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Offline AndyN

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Spark advancer shaft remove from crankshaft
« on: March 30, 2015, 10:21:52 PM »
How to remove #3 in the photo. Double nut or ?

Thanks
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Offline flybox1

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Re: Spark advancer shaft remove from crankshaft
« Reply #1 on: March 30, 2015, 10:28:43 PM »
Yes.  Double nut.  Counter clock wise.
Just know these can bend easily and are not readily available.  Yamiya has them though.
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Offline AndyN

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Re: Spark advancer shaft remove from crankshaft
« Reply #2 on: April 02, 2015, 09:18:23 PM »
Thank you flybox. I heard they were near extinction. :)
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Offline flybox1

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Re: Spark advancer shaft remove from crankshaft
« Reply #3 on: April 03, 2015, 07:26:47 AM »
Flange nuts work best, if you have them. ;)

A bent one came with my current build.
Every few days i searched the part number on ebay.
After a month or so, one came up.  I think I paid $20 for it.
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline 70CB750

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Re: Spark advancer shaft remove from crankshaft
« Reply #4 on: April 03, 2015, 07:41:31 AM »
Just curious, what is the thread on it?  M6 left hand?
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Offline flybox1

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Re: Spark advancer shaft remove from crankshaft
« Reply #5 on: April 03, 2015, 07:48:13 AM »
Quote from: 70CB750 on April 03, 2015, 07:41:31 AM
Just curious, what is the thread on it?  M6 left hand?
M6 right handed
The base thread (into the crank) IIRC, is M8 RH
« Last Edit: April 03, 2015, 07:50:04 AM by flybox1 »
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline 70CB750

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Re: Spark advancer shaft remove from crankshaft
« Reply #6 on: April 03, 2015, 07:50:06 AM »
Quote from: flybox1 on April 03, 2015, 07:48:13 AM
Quote from: 70CB750 on April 03, 2015, 07:41:31 AM
Just curious, what is the thread on it?  M6 left hand?
M6 right handed

Never mind me, I am slow today, your double nut instruction confused me, but its all me, not you, sorry :)

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Prokop
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I love it when parts come together.

Dorothy - my CB750
CB750K3F - The Red
Sidecar


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2006 KLR650

Offline edwardmorris

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Re: Spark advancer shaft remove from crankshaft
« Reply #7 on: April 03, 2015, 08:55:33 AM »
I'll be removing both of mine today, was just about to ask the same question. I had the cranks micropolished but made the mistake of leaving these in place. The good for nothing machine shop jerks bent them irreparably  >:(
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Offline BobbyR

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Re: Spark advancer shaft remove from crankshaft
« Reply #8 on: April 03, 2015, 10:38:01 AM »
I took mine off to make sure it was not getting sticky. It was sticky so I used some hi temp lube on it. I was in a hurry so I had the 3-4 side and 1-4 side reversed. Easy to diagnose since she does not want to run and farts back through the carb. 
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Offline edwardmorris

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Re: Spark advancer shaft remove from crankshaft
« Reply #9 on: April 03, 2015, 11:01:54 AM »
I plan on using this lube with  my new ones

Bosch 5-700-002-025-M114
http://www.amazon.com/Mallory-USA-26015-Distributor-Grease/dp/B000FVXO1G
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Offline BobbyR

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Re: Spark advancer shaft remove from crankshaft
« Reply #10 on: April 03, 2015, 12:41:41 PM »
Looks like good stuff and hard to find nowadays.
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Dedicated to Sgt. Howard Bruckner 1950 - 1969. KIA LONG KHANH.

But we were boys, and boys will be boys, and so they will. To us, everything was dangerous, but what of that? Had we not been made to live forever?

Offline Phinn

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Re: Spark advancer shaft remove from crankshaft
« Reply #11 on: April 03, 2015, 02:05:22 PM »
I hope the advancer shafts are available somewhere, because I stripped the M6 threads off using the double nut method.
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Offline flybox1

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Re: Spark advancer shaft remove from crankshaft
« Reply #12 on: April 03, 2015, 02:28:55 PM »
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline martin99

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Re: Spark advancer shaft remove from crankshaft
« Reply #13 on: April 03, 2015, 03:01:09 PM »
I've buggered them up before using the double nut method. Nowadays I hold them lower down with vise grips, with a thin strip of ally to protect the shaft.
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Build threads:
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Offline evanphi

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Re: Spark advancer shaft remove from crankshaft
« Reply #14 on: April 04, 2015, 05:59:00 PM »
Is there a torque spec for tightening this shaft? Or just snug with the double nutting?
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Offline edwardmorris

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Re: Spark advancer shaft remove from crankshaft
« Reply #15 on: April 04, 2015, 07:29:40 PM »
I was going to do the standard 8ft-lbs for the 6mm bolts. Too much?
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Offline MiGhost

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Re: Spark advancer shaft remove from crankshaft
« Reply #16 on: April 04, 2015, 08:11:34 PM »
A stud puller makes quick work of removing the ignition shaft without the risk of bending like double nutting.

New replacement shafts are available through C5 ignitions.
http://www.c5ignitions.com/motorcycle-ignitions.html
30231-300-010 Honda CB750K Timing Shaft
$34.99

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