I have a 98' 4x4 425 Magnum that just started messing-up. About a little more than half throttle it cuts -out ,poping thru the carb and just bogs down.If you back off,it will idle smooth and if you rev it up slow,it's fine tell you get about 3/4 throttle. Checked fuel,valves,carb,ETC,with no luck, Could it be the limiter????? anyway to adjust?....

Thanks for any help.........MavP

 

Unhook the rev limiter and see how it runs.

 

Disconnected the gray/orange wire,no change.....................
Mavp

 

I had an EX400 that did the same thing. If I ran at part throttle for 20-30 seconds and tried to accelerate it would die and fall onits nose. If I backed off just a little it would be ok. I found that dirt in the tank and a dirty fuel filter was causing the fuel bowl to empty out an it could not recover fast enough. Hey its a cheap thing to look into.

 

Tryed that ,the only thing that helped was cleaning the carb out................but still has problem.

 

MavP,
Did you ever find the problem with your 425 Magnum? I have the same exact 4 wheeler and similar problems you have been having.
Mine idles fine but spits and sputters when you open the throttle. Thanks, PNB