Peugeot Speedfight 100 starts but then cuts out straight awa

[bass2k8]

When I start my moped in the mornings, with the electric start, It stays on for about 2-5 seconds and then cuts out straight away. It even does this with the Kickstart. I try giving it some revs once its started and it still cuts out, even whilst reving!

I have had the carburetta cleaned, the fuel system cleaned, the fuel tap replaced, the automatic choke unit replaced, and the resistors replaced. And it still hasn't fixed the problem. The guy who fixed my moped said the battery was fine, and it was keeping a stable current all around the bike. I don't know what could be the cause of the problem.

The ped is a Peugeot Speedfight 100 Prost 100cc, and is a 2000 model. My previous owner (only 1 owner) had only used it for a year (2000-2001) and then kept it in a garage up until now.

If someone could help, I would be must appreciated. Thanks

[ms51ves3]

How clean is the carb?

Could be possible that it runs for 2-5 seconds on choke (which uses a different fuelling circuit), and then when the choke turns off, it stops running. Pilot circuit may be blocked.

If you can, see if you can hold the choke on manually.

[cb1rocket]

possible faulty choke and the carb is possibly still full of crap despite being cleaned as the crap is still in the tank, unless you have a good filter fitted between the tank and carb hoses

[cb1rocket]

theres no mention of the spark plug being replaced..........

[bass2k8]

@ms51ves3
The carb is pretty much spotless, as well as the fuel tank, and the fuel tap filter is very fine and clean too.

Could you explain what the pilot circuit is please, I'm not very technical minded when it comes to mopeds/vehicles.

@cb1rocket
The choke is not faulty as it has been replaced. Possibly there could be some crap still in there, I am not sure. The filter is very good and clean.

[bass2k8]

@cb1rocket
There is nothing wrong with the Spark Plug, as it starts the engine and ticks over for a couple of seconds. All the electrics work on the bike.

[cb1rocket]

a faulty spark plug will and cause poor running problems and quick cut out unless it has been recently replaced. Also is it the correct type? I know through experience so this can happen.

I had an H100 that would just fire briefly and cut out when starting - new plug sorted

[bass2k8]

@cb1rocket
I don't think he has looked at the spark plug, but if you say that the spark plug could be causing it then I will let him know. How much are they, and where can I get them from?

[bass2k8]

Also another thing I should mention is that he said when he had it all running and fine, it was ticking over for over an hour, so it can't be the spark plug really can it?

The automatic choke that I purchased was used, so I'm thinking that I may need to buy a new one this time?

[cb1rocket]

any bike shop will sell spark plugs, or if your remote from shops then ebay. About 3 quids

The biggest problem with the bike is becaused its been laid up, but your get it sorted in the end

Sorry I had a delay in responding as I had to pop out.

Anyway if its been running quite well for an hour then U suspect the choke is at fault still.

You need to try and establish the choke is actually faulty by adjusting it manually and see what happens.

Am I right, that someone is doing the work for you and your passing on the suggestions?

[bass2k8]

I just been out for a ride on it, and it working fine. I started it by the kickstart and I revved it a bit and it stayed on, so I decided to have a go on it and it runs smoothly. But it will probably not start again tomorrow morning.

I can't adjust the choke, because its an automatic choke. Its an automatic choke for the Dell'Orta PHVA Carburetor. Here is a link to the Choke - https://beedspeed.com/product_info.php?products_id=4196
This is not the place I purchased it from, it was a trader on eBay. If you still think that its the choke, then I will purchase it new from that store. And see what happens.

Yeah a family friend that does up motorbikes is attempting to fix it for me. He also adjusted the tick-over to give out more RPMs on idle. He is coming over later on in the day to diagnose the problem. Will keep you posted on what he says.

[bass2k8]

I haven't passed on the suggestions yet, but I will show him this Topic when he comes over.

[cb1rocket]

just seen the choke.

Thats a pain the arse choke cos its hard to tell whether it actually works or not. Plus no way to manually pull the plunger out to set the choke on manually.

Actually coming to think of it, you could detach the choke from the carb to see whether it actually does work while connected to the electrical loom. If it moves back then its fine, if not then it fubered.

Why not take up spannering yourself? If you want to avoid the garage that is. Pick up a haynes, there is so much you can learn from just reading that. Plus us BCF'ers!

[cb1rocket]

cheaper here?

https://cgi.ebay.co.uk/Automatic-E-Choke-Unit-Peugeot-X-Fight-II-50-02-2T-LC-/150512252514?pt=UK_Motorcycle_Parts&hash=item230b3ab662

its for the 50cc but I'm not sure they are much difference other than that I know they are pretty much the same for all carbs

[bass2k8]

Haha I'd rather not I would probably end up braking it haha. I got a Haynes manual with the moped actually, so I could read it.

I don't need to take it to the garage, I can just let my dads mate look at it for me

Yeah it is a pain The choke we bought online had the wires cut off, and it wasn't the exact same model we wanted. But the mechinism inside was the same so we unscrewed the choke and took the mechnism out of the one we bought online and put it in my old choke.

I just tried starting my moped now and it stayed on with the KickStart... it sounds better if I start with the KickStart than it does when I used the electric start.

[cb1rocket]

ok........its starting to sound electrical related if thats the case.

So much power has gone into the electric starter that the battery is almost flat and the power from the generator is not enough so it quits.

new battery of late?

[bass2k8]

The speedfight 100 prost uses a Dell'Orto carb, and the other 50cc models use another carb. So its a different choke. Thats not the same model as the one I showed u, and the one I showed u is the cheapest I could find!
Here are the prices of the automatic choke on other websites:
£85 - https://www.peugeotscooterspares.co.uk/spares/epc2.asp?PageiD=T6&modelID=7637
£70 - https://www.3xmotorcycles-superstore.com/cms/cms.jsp?menu_id=5472&category=PEPSF2100PCARB&page=2

[bass2k8]

The guy tested the voltage output all around the bike and he said it stays stable throughout, at 12.7 Volts. I'm not sure whether that means its okay or not? All I can say is that I haven't replaced the battery since I purchased the bike, so its had a battery in there since 2001.

[cb1rocket]

that battery is knackered, should be around 13v plus when running and 14v when revved

[baldy]

It's not the choke as the bike would splutter when you ride it. If you leave it ticking over for long periods of time it fills the engine with unburnt 2 stroke. Normally a good run at high rpms and loads will burn it off. It can get to the point where the bike won't start and you will need to fit a new spark plug and then take it for a good run.

If the bike will start off the electric start then the battery will be fine after running.
____________________
One day i will rule the world, just not today.

[N cee thirty]

forget the choke and the battery.

check your air filter,get it going and rag the shit out of it
____________________
'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[cb1rocket]

[baldy]

Exactly what i meant, just the short version.
____________________
One day i will rule the world, just not today.

[bass2k8]

@baldy
I agree with you that it can't be the choke, because it runs smoothly when its running. Normally in the mornings I cannot start using the electric start, but if I can it just cuts out straight away.

I just been out on it down an A road a couple miles long, and went to the shops. Tomorrow I guess I will find a long A road for me to go down on to really clear it all up, if you say that will work.

If it doesn't start tomorrow morning I will let you know

[N cee thirty]

btw by a long ride we mean like more than half an hour

so it gets the engine up to optimal working temperature to burn away all the carbon deposits and your battery will get fully charged in the process


win win
____________________
'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once