9.9 Cam roller synch

[Acton]

So Im doing a carb clean on a 9.9 evinrude. When I put the thing back together I need to synch the cam roller with the cam. The guide talks about hooking some sort of alligator clip onto the starboard side of the carb so that when it just starts to move, the cam roller should align with the cam at the specified mark. When this "alligator clip" starts to move does the butterfly just start to open?

im a greenhorn, this is my first carb rebuild but Ive been reading leeroys ramblings and watching videos on youtube so I have a good idea on how to clean and install the new kit. Reinstalling and synching the carb is a hard concept for me to wrap my head around at this point. So if anyone can break it down in laymens terms Id appreciate it!

 

[Vic.S]

Yes the idea of the wire and croc clip is so that you can easily see when the throttle plate shaft starts to turn. Difficult otherwise. Clip and wire below and pointed to in the second picture by the blue arrow.

 

[Acton]

Okay so the cam roller is connected to the throttle linkage which connects to the throttle plate start shaft. The whole point of the synch is to get the fuel flow synched with the spart timing. Lining up the cam roller with the mark on the cam acheives this. As the cam starts to move towards port this pushes the cam roller forward giving it more gas.

I cant just pull the cam roller forward, turn the cam until its aligned with the mark and then release the cam roller so it lines up right? Ill have to start a little before the mark so that it lines up with the mark just as the throttle plate starts to turn?

I think Im on the right track now, can someone confirm that I am please?

 

[AlTn]

yes...you are "synchronizing" the timing advance < spark timing > with the throttle plate opening which increases the fuel flow out of the carb < venturi effect in the carb throat >...ideally, the center of the roller will align with the timing mark on the cam just as the throttle plate begins to open....however... and you'll read this in leroy's ramblings...you may find that the roller needs to be further up the cam, not by a lot, to achieve an easier start...at wot < wide open throttle > the throttle butterfly should be perfectly horizontal in the carb throat < not over rotated > and the carb roller should be on the highest point of the timing cam...to start these motors, motor in neutral, pull the choke fully on...twist the handle grip to full advance < ccw >...it should attempt to start within 4 pulls or less...when it does, kick it to 1/2 choke and it should start...reduce the rpms as they will be high...push the choke fully off and the motor should remain at idle...adjust idle speed and mixture as necessary