I have a wilderness 250 that won't rev up. Have cleaned carb several times. The only way it will rev up is to squirt carb cleaner into carb throat.
It cranks and idles fine. No air leaks, new plug. Have checked everything I can think off, no luck. Can someone help?

 

Is your governor screw screwed out?
Does it bog down when you open the throttle?
Do you have the factory air box still attached or is their an aftermarket air cleaner on the carb?
Is the air cleaner clean?

Can you take a small 1 minute video so I can see what it is doing?