Vm34 throttle cable adjuster screwed all the way in carb slide still at 5mm

[Ben10]

Hey guys, so I’ve been trying to properly tune my vm34s on my 74 xs650 chopper and even with my throttle cable adjuster screw turned all the way in, the carb slide is still leaving about a 5mm gap (my mixture screws are all the way in). I checked it with a 5/32 bit as well and theres a lot of space. The only way I can get the slide down to the 5/32 bit is by turning my idle screws out a few turns. I thought that turning the mixture screws out a few turns. I was under the impression that turning them in would lower the slide and richen the mixture. I am very confused.

 

[Signal]

Have you got some free play in the throttle cable?
You are confusing the mixture screw and the idle screw.

This is a link to the carb guide it should answer all your questions.
https://www.xs650.com/threads/carbs-carburetors.43/

 

[Ben10]

Thank you! I’ll check out the guide and yeah i do have free play in the cable, all the adjustments made on the cable have gotten the slides as low as possible and they’re still too high.

 

[5twins]

Back the idle speed adjuster screws out. They act upon the slide, raising and lowering it to control/set idle speed.

 

[gggGary]

When you get this straight and start idle tuning. VM34s have air screws. In is richer.

 

[Ben10]

thanks for the help guys! I'm probably wrong but doesn't turning in make it leaner? Since turning clockwise on the air screws moves the slides up for more air to come in? I've been working on my bike for awhile and just now have gotten to the carbs. When I first got the bike from the PO the air screws were almost 5 turns out and kickstarted without choke so I'm assuming it's very rich. The plugs were also wet with fuel and black. If the air screws are turned out less than 3 turns they require choke but right after kickstarting the idle skyrockets (it idles normally when the air screws are turned very far out). I'm thinking the pilot jet is way too big or it's an air leak but leaning towards pilot jet. Any suggestions?

 

[WideAWAKE]

thanks for the help guys! I'm probably wrong but doesn't turning in make it leaner? Since turning clockwise on the air screws moves the slides up for more air to come in? I've been working on my bike for awhile and just now have gotten to the carbs. When I first got the bike from the PO the air screws were almost 5 turns out and kickstarted without choke so I'm assuming it's very rich. The plugs were also wet with fuel and black. If the air screws are turned out less than 3 turns they require choke but right after kickstarting the idle skyrockets (it idles normally when the air screws are turned very far out). I'm thinking the pilot jet is way too big or it's an air leak but leaning towards pilot jet. Any suggestions?

You keep referring to idle screw (that moves the slide up or down) as the air screw. It’s making all the advice given make no sense in your head.

Read the link that signal sent.

What’s the current jetting?

Get a solid baseline.