Help! My Moped Is Acting Up Again...

[Aleks]

I was riding my moped the other day but then it bogged down and wouldn't rev, and it sounded bubbly when it was idling. So I took the carb off and gave it a good clean, put it back on and it had the exact same problem. I then swapped the carb from another bike I had laying around, (same bike for spares), set it up and it worked for a bit. However, about 10 minutes of riding it bogged down again! I left it idling for a minute then I set off without an issue for about 5 mins, then the same thing happened again, so I left it idling again. I set of and it was fine but then bogged down after 2 mins and so on, and I had to limp it back home. This (I think) means the carb isn't filling up fast enough causing it to empty when accelerating, then filling back up while idling. Also, the carb isn't leaking.

Anyway, I was wondering if I could get some tips on what to do because I don't have much experience in this sort of stuff, and I don't want to start dismantling things without knowing what I'm doing and make it worse.

Thanks!

 

[mykb93]

I dont know much about mopeds but if you feel it is being starved for fuel, I would start with the simple stuff like the filter or the lines themselves. I would also look in the bottom of the tank to see if you see any sludge.

I know on my Daytona if you take the tank off there is a HIGH chance that when you put it back on you're gonna get a kink in the line if you are not paying attention.

 

[Aleks]

I dont know much about mopeds but if you feel it is being starved for fuel, I would start with the simple stuff like the filter or the lines themselves. I would also look in the bottom of the tank to see if you see any sludge.

I know on my Daytona if you take the tank off there is a HIGH chance that when you put it back on you're gonna get a kink in the line if you are not paying attention.

Thanks for the reply. Now that you've mentioned it, the fuel lines might have a kink in it as they run directly under the seat. To get to the carb easier I had to take my seat off, and I didn't pay much attention putting it back on. Also, what's the best way to see the bottom of the tank for sludge? I was also thinking about putting some fuel/carb cleaner in the bike. Is that a good idea or not because it is only a 50cc ped? Thanks!

 

[mykb93]

Thanks for the reply. Now that you've mentioned it, the fuel lines might have a kink in it as they run directly under the seat. To get to the carb easier I had to take my seat off, and I didn't pay much attention putting it back on. Also, what's the best way to see the bottom of the tank for sludge? I was also thinking about putting some fuel/carb cleaner in the bike. Is that a good idea or not because it is only a 50cc ped? Thanks!

I'm not sure how your tank runs but on my bike I just used a flash light to shine in while I look through the filler hole. As for the fuel/carb cleaner, I would read the bottle to see if you can. If so, I see no reason not to use some.

 

[Aleks]

I'm not sure how your tank runs but on my bike I just used a flash light to shine in while I look through the filler hole. As for the fuel/carb cleaner, I would read the bottle to see if you can. If so, I see no reason not to use some.

Ok, I'll give it a try Thanks again!

 

[Reize]

If it's not the fuel line, check the air intake as well. I once rode off and the bike sputtered and died, it'll keep starting again, but it will sputter out and die.

Turns out a cloth I kept in my seat where the air intake is as well got clogged in it. Yours could have been clogged with dirt and shit if the fuel isn't the problem.

 

[ChunksLife]

if ur air filter is filling with fuel theirs a chance ur float bowl might be sticking open

 

[Aleks]

If it's not the fuel line, check the air intake as well. I once rode off and the bike sputtered and died, it'll keep starting again, but it will sputter out and die.

Turns out a cloth I kept in my seat where the air intake is as well got clogged in it. Yours could have been clogged with dirt and shit if the fuel isn't the problem.

I'll definitely give it a look today. Thanks!

 

[Aleks]

if ur air filter is filling with fuel theirs a chance ur float bowl might be sticking open

Thankfully it isn't the float bowl because I checked the new carb before putting it on as I was cleaning it out. I'll keep an eye out though for the future. Thanks!

 

[SalvageSV]

Any chance it sat for a while during the off-season? Might just be low quality fuel. Carbed two-stroke engines have the worst time with old fuel.

 

[Lurch]

Fuel lines for kinks, fuel filter, fuel pump (see if you can bypass the pump, may need a full tank to do so) and also air filter.

Check the basics, has it been serviced properly and on time etc etc

 

[Aleks]

Any chance it sat for a while during the off-season? Might just be low quality fuel. Carbed two-stroke engines have the worst time with old fuel.

I had to ride my bike throughout the winter so that wasn't the issue. Finally spring though

 

[Aleks]

Fuel lines for kinks, fuel filter, fuel pump (see if you can bypass the pump, may need a full tank to do so) and also air filter.

Check the basics, has it been serviced properly and on time etc etc

I had actually serviced my bike that same day. Turns out it was a dirty carb at first, but when I replaced it I took the seat off to make it easier and ended up kinking the fuel line when putting it back together. Lesson learned though!

 

[Aleks]

Thanks for all the replies! I have found out that the carb did need a clean, however, while putting it back together I must have kinked the fuel line as I wasn't paying enough attention. Lesson learned though!