Wolf 150cc scooter suddenly bogs out. By anarchy (Read 1,679 times)

[anarchy]

I have a 2020 Wolf EX-150. I rode it all the time and never had any issues. Changed the oil a few times, but haven't done any major work to it. One night I heard a little sputter sound as I was driving but it didn't effect it immediately. About 2 miles down the road, the RPMs dropped and it died.
It hasn't been able to "go" since then. It will start and idle perfectly. But if I get on it and give it has itll almost immediately drop RPM and just sputter and slightly jerk like it's getting a good push but not enough to go. I can let off the throttle and it'll go back to idling just fine.
I've drained the gas that was in it originally. Checked my valve clearance.
Completely cleaned the carburetor including the jets.
Checked all my hoses.
Cleaned the air filter.
I am at a loss and I don't know what to do.
The carb does have a cap on the air/fuel screw so I haven't tried that. I was going to see if anyone could help before I did that.

So, any ideas?

[kz1000st]

When you start it and it's idling listen and see if you hear a hissing noise. It still sounds like a vacuum leak. Maybe a cracked intake manifold or something in the emissions system is letting air in.

[thebunman]

i agree with kz1000st . if it starts and idles fine and you've checked everything else, its gotta be a vacuum leak. replacing the hoses is easy and they look good with the clear colored ones anyways so i'd say swap them out and see if that helps.

when i first bought my scoot (also a wolf 150cc) a little over a month ago i read up on all the parts they upgraded (carb, battery, spark plug, gates belt, etc.) so that i didn't replace anything that didnt need to be. but i believe the scooters still come with crappy chinese hoses so i replaced most of mine with those nice helix ones. it also helps to diagnose issues when they are clear.

if it idles fine then the idle screw shouldn't matter. but i did just drill out the welch plug blocking the mixture screw so i can finally adjust it because mine does have trouble idleing when cold