What the heck? - Scooter bogging out after half throttle, why?

So I have installed a new carburetor and fuel lines and a fuel filter. Fires up instantly with electric start and idles great. Snappy throttle response but anything over half throttle and she dies; let off and the engine comes back to life. If I hold it open she will coast to a stall. The fuel filter has fuel in it when this is happening.

I've checked the ETON CDI and both restriction wires are cut. This is just annoying now...

[apachesarge]

This is one of three things in my experience. Start with your carb. Then check your belt. If these are both fine you might have an issue with your stator

[DC_Babba]

check your fuel filter, cdi, sparkplug and check for leaks and check carberateur

[DoeBoy]

Mine did the same thing an wound up being the spark plug swapped it out runs great now

[bchill]

Had a similar issue, could be that it's not being able to suck enough fuel in so check u have an air vent over ur fuel cap, if not try it without ur cap or check fuel lines. Might not be but worth a check

[youssefhmd]

It happened to me a while ago. I had a piaggio liberty 50cc . So it was from that tiny needle on the carb that does not let enough air to flow when accelerating , solition ? Replaced the whole carb, hard to fix

[logansutton]

I cleaned my carburetor and that fixed mine

[willhoggard]

Check the intake boot seems to me it may have a crack in it pulling too much air in the intake

[nastynatesscooters]

It’s running lean? Air filter not on right? Or a airleak somewhere

[WheelsupGabe.wheelsup]

I’m gonna try to clean the carb and see if it fixes I’ll let you know

[paco_rider]

Carburation problem look like you are letting too much air, mine did the same and i put the stock filter and is ok now, also it can be the opposite, mai be you have a big carb and it is putting too much gasoline... you have to tune it and see

[ORIGINALCONCEPTGARAGE]

Yeah it's carb is very touchy on these especially if you have a Delorto Carb

[muzamilzaman]

I’m having the same issues. I did however jet up a little bit and it fixed the problem for the top end. Now i gotta adjust the quarter throttle which is the pilot jet

[Jamcc]

I know I'm late but for anyone still wondering, previous owner on my SR had a smiliar issue - bike ran fine and revved fine but bogged when moving, sold to a dealer for cheap as he couldn't be fucked to fix it. The dealer told me they replaced the barrel and piston but to no avail, and turns out it was the crank seals that were the problem. I'd give them a check, and don't shy away from it all. 50 2 smoker engines are cheap to repair, and if you need to replace the piston for whatever reason in the future, i'd reccomend just getting a 70 kit as they tend to be able to cope with the ragging these 2 strokes usually undergo
.

[quintendoty]

Had similar/same issue. Hard to tell for sure of course. Ended up being on the air intake box. The hose that comes off to let in fresh air has a circle piece with 4 holes to restrict air. That fell out during some leaning and I could not get the bike over 15mph. hills were death. Ziptieing that on nice and snug so it does not fall off again and end up on the road next time

[gangmyplank]

you can try to add a cloth or something like that to the air filter, ive done it a couple of times

[JDMz]

Lack of fuel in the float bowl. Adjust the needle

[ChrisWilliams-iuvu]

Mines having the same problem, put a brand new racing clutch and variator kit on it but my mates saying it’s the not getting enough fuel into the carb meaning it needs new jets in it so I’ve ordered some 140mm jets to put in Monday but if that doesn’t fix it then I ain’t got a clue. I can only slightly accelerate but soon as I go past the point it just stops accelerating but goes back to normal soon as I let go and slightly Rev again

[rushfanthcmd]

I loosened my gas cap just a bit. It sounded like a type of vapor lock and wasnt getting enough gas. Tried a few things. Loosened it just a bit and it roars its 49cc behind right down the road.

[aland.grimes]

Clogged main jet. Take off the bowl on your carb remove the main jet clean it. You must take it out so you can clean the entire thing not just the center hole. Reinstall. Also make sure to clean the housing it lives in as well. It's easy to do and should fix the problem. Also you may need to shim or adjust your needle valve.

[BusyMEOW]

I got a new spark plug and it fixed a similar bogging down issue, the gap was too big for the arc on the plug I pulled out.

I'd suggest replacing your spark plug first, it was quick and easy for me.