Peugeot 103 starting help!!

I just got a 77 Peugeot 103, It's in great shape. I cleaned the carb , put in a new spark plug, new fuel line. The problem is it doesn't seem to be sucking enough gas. It will start and run for about 3 seconds then die. I took the carb off and cleaned it again, but it still wont stay running. I know there is gas going into the carb, but not enough to keep it running.

any thoughts?

thanks russ

Re: Peugeot 103 starting help!!

have you tried messing witht he idel/mixture screw?

screw it all the way in then out about a one and a quarter turn.

also make sure that your chokeing the engine till it get up to good running temperature.

hold the choke in as soon as it start to die.. if this helps then you probly just weren't waiting long enough.

if neither of these work write me back.

Re: Peugeot 103 starting help!!

did you check an see if you got a good flow to the carb.see if your getting good flow out of the gas tank.

when its running did you try pulling the choke and see if it will keep running.

Re: Peugeot 103 starting help!!

KelvinKDX /

When you took your carb off did you clean it completely?

Did you take out the float and the internal filter and de-gum them? How long has the 103 been sitting? Hopefully - if it has been sitting very long you have drained and flushed the tank.

Tell us as much as you can after you try again.

Re: Peugeot 103 starting help!!

the puegeot 103 (gurtner 12mm) carb is pretty easily cleaned up. There isn't alot of places in it to get clogged up.. if you cleaned the filter up then you shouldn't have a problem with anything else if its running for a few mintues.

If you didn't get to the internal filter it is easy just find the big 6 point screw on the bottom side of the carb.. you dont have to even take the carb off the bike to access it.


I think your problem is simple... I would check to make sure your choke is working and that your actualy giving it long enough to warm up and run on its on before releasing it. Also if you get it running and it dies while you have the choke held in... try to reach down on the the bike and turn the adjustment screw until your able to keep it running as you let off the clutch. once you get it to stay running you can adjust it to where it runs best.

Re: Peugeot 103 starting help!!

I have cleaned the carb three time, I even took the filter out to see if it was slowing down the flow, but there was no change. The choke didn't matter either, it still only runs for about 2 secounds and the only way I can get it to start again is to remove the gas line from the carb for a secound.

Its seems to not be sucking the gas. I know the flow from the tank is fine and I know the gas is getting into the carb, could it be a problem further up the line? a compression problem?


Re: Peugeot 103 starting help!!

Maybe a bad reed valve.

Go to this link to see how a Reed valve works. It basically should create a vacuum on the downstroke to cause the gas to be sucked into the chanber. If it is defective it will not create the vacuum to keep sucking in the gas.


It could be the reed valve or a own head gasket or defective engine gasket seals. Any of these would cause an air leak that would prevent a vaccum from being created.

Re: Peugeot 103 starting help!!

Sorry, here is the Reed valave link so you can click on it

Somewhere in my memory banks I remember something about having to drill out one of the plugs in the carb to blow it out and then replug it. Check with the tech support guy at the mopedwarehouse, I think he may be able to help you.

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