CB750: spark advancer shaft ... need help!

[Sgt.Pinback]

I have an issue with the spark advancer shaft (Pivot) of my current project KO. (part No. 8 on E-7 parts list)

It is too long by some mm as somebody has welded it when it was broken. 

I bought a new one but: how do I get out the old one?

Is it just screwed in or is it in addition hold by the engine case itself? Please check out the pics and note that gap before the thread.

[hairygit]

It's screwed, and is a standard right hand thread.

[Bryanj]

There is also an O ring on there which should be replaced

[Sgt.Pinback]

Thank you all!

[AshimotoK0]

Thank you all!

There is a service bulletin about it (SB No. 9)... James have you got that download please... off to DK at 10

Here a list:(they should be in the Download James has a copy of)

CB750 #1
6-69
Charging System Diagnostic Tips
CB750 #2
5-69
Pre-Delivery Service
CB750 #3
6-69
Setup Particulars
CB750 #4
9-69
Drive Sprocket Recall
CB750 #5
9-69
Drive Chain Maintenance
CB750 #6
11-69
Cylinder Head Damage
750 #7
10-71
Air Filter Box Fasteners
CB750 #8
11-69
Bent Advancer Shaft
CB750 #9
11-69
Manometer Use
750 #10
12-69
Loose Alternator Bolt
750 #11
11-71
Front Brake Lever Freeplay
CB750 #12
1-70
Revised Break-in Procedure
750 #13
1-70
Revised Oil Filter Case
750 #14
10-72
Main and Rod Bearing Selection
750 #15
4-70
Throttle Cable Recall
CB750 #16
5-70
Camshaft Tower Caution
CB750 #17
5-70
Revised Drive Chain Oiler
750 #18
6-75
Drive Chain Type Caution
CB750 #19
7-70
Correct Cam Chain Adjustment
CB750 #20
7-70
Crankcase Breather Fitting
CB750 #21
7-70
Drive Chain Maintenance
CB750 #22
8-70
Chain Guard and Oiler Mods
CB750 #23
9-70
Excessive Front Brake Pad Wear
CB750 #24
8-70
Revised Output Shaft Bearing
Cust Letter
12-28-70
Throttle Cable Recall
750 #25
9-71
Linkage Type Carb Adjustment
CB750 #26
12-70
Brake Disc Mounting Bolts
750 #27
3-72
Spark Plug Fouling
750 #28
2-71
Drive Chain Installation
750 #29
4-71
Revised Crankcases and Output Bearing
750 #30
5-71
Drive Chain Oiler Adjustment
750 #31
8-74
Connecting Rod Weights
750 #32
8-71
Chain and Crankcase Recall
750 #33
11-72
Wiring Harness Routing
750 #34
5-72
Shimming Front Brake Caliper Mount
750 #35
11-72
Revised Oil Tank Feed Hose
750 #36
4-73
Rear Brake Wear Indicator
750 #37
11-73
Sprocket Manufacturing Tolerances
750 #38
11-73
Muffler Warr Extension
750 #39
2-74
Use and Removal of Revised Head Gask
750 #40
4-74
Revised Shift Drum
750 #41
4-74
Revised Fork Seals
750 #42
7-75
Intro of Head Gask Stud Seals
750 #43
1-75
Revised Pos Batt Cable
750 #44
4-75
License Plate Bracket
750 #45
3-76
Instrument Mounting Cushions
750 #46
3-78
F Model Brake Pad Recall
750 #50
4-78
Automatic Fuse Box Recall
SL #83
11-72
750 Master Cyl Reserviour
SL #87
6-71
750 Final Drive Bearing
Service Rem
5-75
750F Fuel Tank Caps
"Wrench"
3-76
750 Clutch Chatter
Service Rem
8-76
750 Rear Sprocket Dimensions
"Wrench"
12-76
750 Clutch Chatter
Service Rem
1-77
750 O-Ring Chains
Service Rem
4-77
750 Pipe Bluing
"Wrench"
4-77
750 Cam Breakage
SL #108
10-77
750 Wheel and Tire Matching
SL #124
10-78
750 Speedo Cable Alignment
Pts News
6-4-80
750F2-F3 Fuse Box Recall