Hard to reach carb vaccum screws

[Guest]

Is there a trick to this or am I just dumb? I can get to the #1 and #4 adjusters easily but for carb #2 its hidden away under the throttle and choke mounts. Its too tight of a fit to use the sync tool

[1_v8_merc]

Yeah, kind of a pain, I think I rigged a small 8mm wrench for the nut and use a flexible screwdriver for the screw.

[Badooka]

Yeah I broke down and spent 20$ for one of these- makes it a breeze-
You can actually lock the synch whilst tightening the nut.

[elrico]

Tank on or off?

[cowboyup3371]

Remove the choke mount for the carb synch as you really won't need it once the bike is warmed up properly first anyway.

[Steve]

Tank on or off?

It would be a neat trick, indeed, to be able to do that with the tank on.

I have a long extension for an 8mm nutdriver that I use. I will loosen the locknut with the engine OFF by cranking the throttle about half-way, then reaching from behind the top of the airbox with my long nutdriver.

The actual adjustment is not much of a problem, but locking it back down gets a bit tricky. I will get the sync set, then turn the engine OFF, rotate the throttle so I can reach the locknut with my nutdriver, then check the sync again. It usually moves a bit, so I have to note where it is, re-loosen the locknut, make a small adjustment to the screw, lock it down, re-check the sync. I usually have to do this 2 or 3 times to get it right.

I have an idea for changing this process, but need to get home to try it out.

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[Badooka]

On my 750T frame I have to come at it from the front instead on straight down-
on #3.

[BassCliff]

Hi,

I use the carb tool. The tank has to be off. I don't have to remove the choke assembly. But I do have to loosen it so that it moves out of the way a bit. It is kind of tricky reaching down through the frame to get to the #2 vacuum adjustment, but it can be done.

Here's my documentation:

Synchronize Carburetors
(With the Morgan Carbtune)

Thank you for your indulgence,

BassCliff

[Toasty]

Thanks Steve, I was able to get the locknut loose after turning the throttle so I could get to it easier. The carbs are all synced up and idle screws set, it idles and runs like a dream. When the bigger mains it really revs now I can't wait to go for a test ride.

[Steve]

Yep, you might have to fiddle with the final position a few times when locking it down, but I found it MUCH easier to rotate the throttle.

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