Topic: Big issue with the carbs

[Patgaret]

I suggest that the lifting arms and cable pulleys are not properly "clocked" on the shaft, preventing sufficient cable freeplay and full slide closure.

But it’s impossible to adjust or change the position of the lifting arms and the cable pulleys. They have a default setting position which is not adjustable.

Not true, the arms and the pulleys have setting bolts and can be mis aligned. Enlarge attached pic, see bolts circled

The lifters are keyed on the shafts.  The only way that could happen is if they were reassembled without the keys installed.

What do you mean by « the keys installed « ? There is a few little grooves in the shaft where the arms and the lifters fits in it. So that why it’s impossible to change the inclination. But maybe I’m wrong.

[ofreen]

What do you mean by « the keys installed « ? There is a few little grooves in the shaft where the arms and the lifters fits in it. So that why it’s impossible to change the inclination. But maybe I’m wrong.

Woodruff keys.

[jpdevol]

Well, let's try this again. The "rack", as it is referred to, aka "Stay Plate" per factory manuals  - "Beam system" in marketing materials - is apparently not intended to be disassembled. There are no breakdowns of individual parts in this assembly in parts fiches or FSM's. I had occasion to disassemble one approximately 18 months back. I do not recall any woodruff keys or similar limitations in the assembly. I recall that the re-assembly was not difficult, but the relative positioning of the pulleys and lifting arms on the shaft need careful alignment. There are no instructions in the FSM nor in Hondaman's book on the procedure to achieve that proper alignment. The goal is to have the slides able to drop to the bottom of their bore with lifting arms attached at rest and the pulleys positioned to give cable freeplay at rest. They all are held in position via pinch bolts on lifting arms and set-bolts on the pulleys. It can be done. Take your time, use your common-sense and experiment to achieve the balanced alignment described. Attached pics from another angle, pertinent FSM pages and parts exploded view -such as they are.

[CaptFatCat]

I think you did your bench sync with the slides to high, because with the idle screw all the way out it would completely close the slides.  And once the motor starts forget about the choke.

[ofreen]

Well, let's try this again.

I'm all for additional tries. 

I can't speak to a how a K1's rack is put together, but a '75 750F's (such as patgaret has) linkage lifters are keyed to the shaft.  So was the set I got off feebay to obtain a replacement lifter that broke on mine last year (I don't remember what model 750 they were from).  The assembly was also pinned in a couple of places.  The shafts have divots machined into them for the halfmoon keys and corresponding grooves in the lifters and shafts.  I'd be surprised if they all are not like that, but who knows.  The alignment wouldn't be very positive over time without them.

[jpdevol]

Fair enough...
I do have a '76 750F that I purchased last fall, I rebuilt carbs, test ran and prepped for storage for future resto-mod cafe (R1 front-end, Sun rims, yada). I didn't need to disassemble "Stay Plate" on that job and I'm not about to open it up to find out. lol.

The disassemble plate was on a K1 and chose that manual as the contents are often more thorough on explanation of then "new" concepts: "Beam throttle assy."

Good luck @ Patgaret!