Vanguard carb sticking at full throttle

[jwelch973]

I was hoping for a little help, I'm not really good with carbs. I have a 1997 Max IV with an 18hp vanguard motor. The motor runs good from idle to full throttle but sticks at full throttle. Once I get to full throttle, the linkage stays there until I manually push the linkage closed. The previous owner adjusted the throttle cable so it only went to 3/4 open, so I think he had the same problem. I've attached a few pictures. Could I be missing a spring? If not, what causes the throttle to come off wide open?

[liflod]

Disconnect the throttle cable to see if that is binding or corroded.

[jwelch973]

With the throttle cable off (and motor off) it still sticks at wide open.

[liflod]

Is the butterfly binding or the governor linkage?
You may need to disconnect some more of the linkage to find it.
PB blaster the whole thing.

[jwelch973]

It's the semi round piece that the throttle cable attaches to, I assume that's the governor linkage. When you move that clockwise to full throttle it gets hung on the metal bracket. I was thinking there was a spring issue, sounds like maybe just lubricate and clean up the metal on both pieces that are catching?

[liflod]

Clean and lube and try it again.

[snaps10]

Mine does the same. The governor moves a millimeter or so too far and will stick closed. I just shortened my throttle cable until it was just before getting to that point.

[garretttpe]

I removed the governor linkage and spring, installed a high rev kit and a tiny tach and no issue's, I dont go over 4600 RPM as I do not have a billet flywheel yet, but the extra RPM/POWER is there when I need it. I can easily hit 5400 RPM.

[ARGOJIM]

One might guess the bottom section of the round part on top (where the spring and cable attaches) is slightly bent and comes into contact with the indented part ( largest visible piece with the large rust area on it) of the mounting bracket.
To me it looks like it was bent without the proper tang bender ( like I did to Tommy's this weekend) distorting it.

[snaps10]

Bingo. That’s exactly what’s up with mine