Startup revs out of control

[footballnick17]

Hi guys, im having an issue with my startup, whenever i start it up it revs out of control and im forced to stop it because it seems like its going full throttle

Info:

Twin SU Carbs

Smog Equipment removed

L24 Block

N42 Head

And sometimes it revs all the way, stops, air pops out of the carb then it revs back up again almost to red line and continues

[siteunseen]

Have you recently messed with the linkage in between the carbs?  I had that happen when I took mine off and didn't reinstall those flats or stops in the right order.  The ones with the screw and spring.

[siteunseen]

This is what I'm talking about.

[footballnick17]

Yes i removed the link between do you have a picture of what it is supposed to look like? 

 

I must have not put it back correctly

Edited October 28, 2017 by footballnick17

[siteunseen]

Hopefully you can see from this picture I robbed of google.  Give me a few minutes and I'll snap a pic of mine.

[footballnick17]

mine looks like this

[siteunseen]

It's the front one that has to be stacked right.  Here's some shots of mine, hope this helps.

 

 

[footballnick17]

thanks so much i appreciate it

 

[footballnick17]

This is what happens, i suspect the carbs are letting in too much fuel

IMG_3187[1].MOV

[siteunseen]

I'm on my phone so not seeing the video. 

You appear to have put new boots on the choke cables. Maybe the wires are too short. If I remember right from the locking barrel at the ends it should measure 2" to hold down for the cable. When full choke is on it measures 1 1/4". 

Also feel the bottom and see if the nozzles are up or down. I'm just guessing at things that I've had trouble with. 

Good luck.

[footballnick17]

The choke doesnt seem to be the problem the jets are fully up, is it possible that the new fuel pump i have has too much fuel pressure and is giving too much gas. I know theres something wrong with the carbs or the pump, would it be worth while to get some new ones

[siteunseen]

I'm a very frugal thinking guy so if it were mine I would try and pinch the supply fuel line  coming out of the fuel filter to lower the psi before buying new parts. Or make a sharp bend by hand in the supply hose and see what effect that has. You could do that while it's running at high rpms. See if it comes down. Is it the OE mechanical pump off the cam nose or do you have an electric pump.