Typically about 1/16 inch of free play on the cable before it starts opening the carb - would be helpful to know that year and displacement Magnum you have - I'm basing my guess on a 96 to 98 425 Magnum - here's the text from the manual:

Throttle Cable I Electronic Throttle
Control (ETC Switch) Adjustment
1. Slide boot off throttle cable adjuster and jam nut at
throttle block.
2. Place shift selector in neutral and set parking brake.
3. Start engine and set idle to.
NOTE: Be sure the engine is at operating temperature.
See Idle Speed Adjustment.
4. Loosen lock nut.
5. Turn cable adjuster out until engine RPM starts to
increase.
6. Turn cable adjuster back in until throttle lever has
1/16" (.16 cm) of travel before engine RPM
increases. Be sure ETC switch plunger is held
inward by throttle cable tension.
7. Tighten lock nut securely and slide boot completely in
place to ensure a water-tight seal.
NOTE: On 2 stroke models, whenever throttle cable adjustments
are made, always check oil pump adjustment.
Refer to pages 2.19 2.20 for adjustment procedure.
8. Turn handlebars from left to right through the entire
turning range. If idle speed increases, the throttle
cable freeplay must be increased, or check for proper
cable routing.

 

i took the vacuum line off the carb that goes to the fuel pump and tryed it and it seems to run better but revs higher could there be dirt in the fuel pump or should i take the carb all apart and clean it good cause i adjusted the throttle cable from the last post and it didnt cure the problem it seems like its not getting enough air i installed a brand new air filter also so any ideas....

 

Sounds like a bad fuel pump.

 

so should i take the fuel pump apart blow it all out and try that ???

 

If you unhooked the pulse line and it ran better with no bogging, the diaphragm in the pump is probably leaking fuel into the pulse line and intake.
What year model/size magnum you got?

 

Looks like most all are the same anyway other than OEM are priced about four times too high lol... here's a link.

https://www.ebay.com/itm/Fuel-Pump-...325-330-425-500-2X4-4X4-6X6/292295222108?hash=item440e27235c:g:SOUAAOSwknJXx~9W

 

Sounds like a good guess - I just replaced one on a 98 425 magnum along with a petcock - it cured his woes

 

Yeah, I think things like that are getting more common as alcohol takes its toll on rubber fuel system parts in these older machines. I just got done going through the carb, tank and lines on a 09 Rubicon. The carb was not really dirty but had little bits of stuff that kinda looked like grains of sand or something in the starter jet and slow jet. Couldn't really figure out where it was coming from or exactly what it was. I surmised it was probably from the interior of the fuel line crumbling up from alcohol exposure. The machine had set a lot last couple years.

 

96 425 magnum 4x4

 

The pump I posted before will work

 

i took the fuel pump all apart blew it all out with air and the vacuum line was dry so didn't seem to be gas going into it and the bike is still running like shit i played around with the air mixture screw and that doesn't seem to do anything either plus when i rev it up there's black smoke coming out of the exhaust im out of ideas to try and about to take it to a garage....

 

By disconnecting the throttle override switch would that make the engine bog? I tried that to see if it would make a difference and it doesn't seem to matter.

 

The override won't make the machine "bog" down. It cuts the ignition. If that's what's happening that's a totally different thing. Disconnect the black wire from the rev limiter if that is your problem and see what it does.