Author Topic: ARGH. Slightly bent advancer shaft & jumping 2/3 timing...  (Read 732 times)

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Offline grumpy

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ARGH. Slightly bent advancer shaft & jumping 2/3 timing...
« on: November 10, 2014, 11:20:32 AM »
Dammit, I can't get my advancer shaft straight enough to for 2/3 timing to be steady.
Been like that since I got it. Tried many times to straighten it using a homemade runout gauge & rubber mallet. Can't get it close enough.  >:(
There must be a more elegant & effective method ??
Any good tricks?


Maybe switch to a 20lb sledge or a 6' extension/pry bar?
« Last Edit: November 10, 2014, 11:23:51 AM by grumpy »

Offline flybox1

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Re: ARGH. Slightly bent advancer shaft & jumping 2/3 timing...
« Reply #1 on: November 10, 2014, 12:44:08 PM »
i just said ufck-it and bought a NOS one for $20  :P 
no regrets, but it took a while for one to pop up on feebay.
'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

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Offline MCRider

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Re: ARGH. Slightly bent advancer shaft & jumping 2/3 timing...
« Reply #2 on: November 10, 2014, 01:11:59 PM »
Dammit, I can't get my advancer shaft straight enough to for 2/3 timing to be steady.
Been like that since I got it. Tried many times to straighten it using a homemade runout gauge & rubber mallet. Can't get it close enough.  >:(
There must be a more elegant & effective method ??
Any good tricks?


Maybe switch to a 20lb sledge or a 6' extension/pry bar?
I can't imagine that if it was messing up 2/3, that it wouldn't mess up 1/4 also?

A new one may be in your future. A new point plate may be also.  The good ones are "TEC" brand.
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"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline grumpy

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Re: ARGH. Slightly bent advancer shaft & jumping 2/3 timing...
« Reply #3 on: November 11, 2014, 09:41:04 AM »
Quote
I can't imagine that if it was messing up 2/3, that it wouldn't mess up 1/4 also?

not necessarily - 2/3 go first. can't recall exactly why. there's a Hondaman blurb on it somewhere...

the points plate is a new TEC so that's good

can't replace the shaft w/out splitting the case, no?


Offline flybox1

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Re: ARGH. Slightly bent advancer shaft & jumping 2/3 timing...
« Reply #4 on: November 11, 2014, 09:55:55 AM »
just double nut it and back it out. 
6mm IIRC

...might be easier to get it straight if its out
« Last Edit: November 11, 2014, 09:57:29 AM by flybox1 »
'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 754

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Re: ARGH. Slightly bent advancer shaft & jumping 2/3 timing...
« Reply #5 on: November 11, 2014, 10:03:32 AM »
Just run it by a machinist, or millwright, (with a dial indicator,and soft hammer), and bring a 6 pack
Felt pen mark the points plate if you remove it..
 Should be able to get it to.004 TIR or less.. Easily..
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Offline grumpy

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Re: ARGH. Slightly bent advancer shaft & jumping 2/3 timing...
« Reply #6 on: November 11, 2014, 10:17:02 AM »
Really? It just unscrews??
Damn, yeah. Should be way easier to get it straight with it out.

I'm sure this is obvious but... right hand thread? (better to be sure than f it up)

Offline 754

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Re: ARGH. Slightly bent advancer shaft & jumping 2/3 timing...
« Reply #7 on: November 11, 2014, 10:18:34 AM »
Really easiest to straighten,  still in the crank..
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline flybox1

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Re: ARGH. Slightly bent advancer shaft & jumping 2/3 timing...
« Reply #8 on: November 11, 2014, 10:34:58 AM »
Once you get it out, you'll probably see an old, compressed o-ring on it.  Get a new one on there  ;)
Unless someone knows size off-hand, you can mic the waist where it sits, and the OD of the shaft to get aprox o-ring size.
'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 grumpy

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Re: ARGH. Slightly bent advancer shaft & jumping 2/3 timing...
« Reply #9 on: November 11, 2014, 05:39:06 PM »
yeah, saw that o-ring on the fiche: 6x2.3

754:
my gauge doesn't work well with it on-bike. no place to anchor it. figure if I might have a better shot with it on the bench...